18 files changed, 1033 insertions, 49 deletions

diff --git a/tools/power/cpupower/man/cpupower-set.1 b/tools/power/cpupower/man/cpupower-set.1
index c4954a9fe4e7..9dbd536518ab 100644
--- a/tools/power/cpupower/man/cpupower-set.1
+++ b/tools/power/cpupower/man/cpupower-set.1
@@ -85,15 +85,6 @@ Possible values are:
 savings
 .RE
 
-sched_mc_power_savings is dependent upon SCHED_MC, which is
-itself architecture dependent.
-
-sched_smt_power_savings is dependent upon SCHED_SMT, which
-is itself architecture dependent.
-
-The two files are independent of each other. It is possible
-that one file may be present without the other.
-
 .SH "SEE ALSO"
 cpupower-info(1), cpupower-monitor(1), powertop(1)
 .PP
diff --git a/tools/power/cpupower/utils/helpers/sysfs.c b/tools/power/cpupower/utils/helpers/sysfs.c
index c6343024a611..96e28c124b5c 100644
--- a/tools/power/cpupower/utils/helpers/sysfs.c
+++ b/tools/power/cpupower/utils/helpers/sysfs.c
@@ -362,22 +362,7 @@ char *sysfs_get_cpuidle_driver(void)
  */
 int sysfs_get_sched(const char *smt_mc)
 {
-        unsigned long value;
-        char linebuf[MAX_LINE_LEN];
-        char *endp;
-        char path[SYSFS_PATH_MAX];
-
-        if (strcmp("mc", smt_mc) && strcmp("smt", smt_mc))
-                return -EINVAL;
-
-        snprintf(path, sizeof(path),
-                PATH_TO_CPU "sched_%s_power_savings", smt_mc);
-        if (sysfs_read_file(path, linebuf, MAX_LINE_LEN) == 0)
-                return -1;
-        value = strtoul(linebuf, &endp, 0);
-        if (endp == linebuf || errno == ERANGE)
-                return -1;
-        return value;
+        return -ENODEV;
 }
 
 /*
@@ -388,21 +373,5 @@ int sysfs_get_sched(const char *smt_mc)
  */
 int sysfs_set_sched(const char *smt_mc, int val)
 {
-        char linebuf[MAX_LINE_LEN];
-        char path[SYSFS_PATH_MAX];
-        struct stat statbuf;
-
-        if (strcmp("mc", smt_mc) && strcmp("smt", smt_mc))
-                return -EINVAL;
-
-        snprintf(path, sizeof(path),
-                PATH_TO_CPU "sched_%s_power_savings", smt_mc);
-        sprintf(linebuf, "%d", val);
-
-        if (stat(path, &statbuf) != 0)
-                return -ENODEV;
-
-        if (sysfs_write_file(path, linebuf, MAX_LINE_LEN) == 0)
-                return -1;
-        return 0;
+        return -ENODEV;
 }
diff --git a/tools/testing/ktest/examples/README b/tools/testing/ktest/examples/README
new file mode 100644
index 000000000000..a12d295a09d8
--- /dev/null
+++ b/tools/testing/ktest/examples/README
@@ -0,0 +1,32 @@
+This directory contains example configs to use ktest for various tasks.
+The configs still need to be customized for your environment, but it
+is broken up by task which makes it easier to understand how to set up
+ktest.
+
+The configs are based off of real working configs but have been modified
+and commented to show more generic use cases that are more helpful for
+developers.
+
+crosstests.conf - this config shows an example of testing a git repo against
+    lots of different architectures. It only does build tests, but makes
+    it easy to compile test different archs. You can download the arch
+    cross compilers from:
+  http://kernel.org/pub/tools/crosstool/files/bin/x86_64/
+
+test.conf - A generic example of a config. This is based on an actual config
+     used to perform real testing.
+
+kvm.conf - A example of a config that is used to test a virtual guest running
+     on a host.
+
+snowball.conf - An example config that was used to demo ktest.pl against
+     a snowball ARM board.
+
+include/  -  The include directory holds default configs that can be
+    included into other configs. This is a real use example that shows how
+    to reuse configs for various machines or set ups. The files here
+    are included by other config files, where the other config files define
+    options and variables that will make the included config work for the
+    given environment.
+
+
diff --git a/tools/testing/ktest/examples/crosstests.conf b/tools/testing/ktest/examples/crosstests.conf
new file mode 100644
index 000000000000..46736604c26c
--- /dev/null
+++ b/tools/testing/ktest/examples/crosstests.conf
@@ -0,0 +1,260 @@
+#
+# Example config for cross compiling
+#
+# In this config, it is expected that the tool chains from:
+#
+#   http://kernel.org/pub/tools/crosstool/files/bin/x86_64/
+#
+# running on a x86_64 system have been downloaded and installed into:
+#
+#   /usr/local/
+#
+# such that the compiler binaries are something like:
+#
+#   /usr/local/gcc-4.5.2-nolibc/mips-linux/bin/mips-linux-gcc
+#
+# Some of the archs will use gcc-4.5.1 instead of gcc-4.5.2
+# this config uses variables to differentiate them.
+# 
+# Comments describe some of the options, but full descriptions of
+# options are described in the samples.conf file.
+
+# ${PWD} is defined by ktest.pl to be the directory that the user
+# was in when they executed ktest.pl. It may be better to hardcode the
+# path name here. THIS_DIR is the variable used through out the config file
+# in case you want to change it.
+
+THIS_DIR := ${PWD}
+
+# Update the BUILD_DIR option to the location of your git repo you want to test.
+BUILD_DIR = ${THIS_DIR}/linux.git
+
+# The build will go into this directory. It will be created when you run the test.
+OUTPUT_DIR = ${THIS_DIR}/cross-compile
+
+# The build will be compiled with -j8
+BUILD_OPTIONS = -j8
+
+# The test will not stop when it hits a failure.
+DIE_ON_FAILURE = 0
+
+# If you want to have ktest.pl store the failure somewhere, uncomment this option
+# and change the directory where ktest should store the failures.
+#STORE_FAILURES = ${THIS_DIR}/failures
+
+# The log file is stored in the OUTPUT_DIR called cross.log
+# If you enable this, you need to create the OUTPUT_DIR. It wont be created for you.
+LOG_FILE = ${OUTPUT_DIR}/cross.log
+
+# The log file will be cleared each time you run ktest.
+CLEAR_LOG = 1
+
+# As some archs do not build with the defconfig, they have been marked
+# to be ignored. If you want to test them anyway, change DO_FAILED to 1.
+# If a test that has been marked as DO_FAILED passes, then you should change
+# that test to be DO_DEFAULT
+
+DO_FAILED := 0
+DO_DEFAULT := 1
+
+# By setting both DO_FAILED and DO_DEFAULT to zero, you can pick a single
+# arch that you want to test. (uncomment RUN and chose your arch)
+#RUN := m32r
+
+# At the bottom of the config file exists a bisect test. You can update that
+# test and set DO_FAILED and DO_DEFAULT to zero, and uncomment this variable
+# to run the bisect on the arch.
+#RUN := bisect
+
+# By default all tests will be running gcc 4.5.2. Some tests are using 4.5.1
+# and they select that in the test.
+# Note: GCC_VER is declared as on option and not a variable ('=' instead of ':=')
+# This is important. A variable is used only in the config file and if it is set
+# it stays that way for the rest of the config file until it is change again.
+# Here we want GCC_VER to remain persistent and change for each test, as it is used in
+# the MAKE_CMD. By using '=' instead of ':=' we achieve our goal.
+
+GCC_VER = 4.5.2
+MAKE_CMD = PATH=/usr/local/gcc-${GCC_VER}-nolibc/${CROSS}/bin:$PATH CROSS_COMPILE=${CROSS}- make ARCH=${ARCH}
+
+# all tests are only doing builds.
+TEST_TYPE = build
+
+# If you want to add configs on top of the defconfig, you can add those configs into
+# the add-config file and uncomment this option. This is useful if you want to test
+# all cross compiles with PREEMPT set, or TRACING on, etc.
+#ADD_CONFIG = ${THIS_DIR}/add-config
+
+# All tests are using defconfig
+BUILD_TYPE = defconfig
+
+# The test names will have the arch and cross compiler used. This will be shown in
+# the results.
+TEST_NAME = ${ARCH} ${CROSS}
+
+# alpha
+TEST_START IF ${RUN} == alpha || ${DO_DEFAULT}
+# Notice that CROSS and ARCH are also options and not variables (again '=' instead
+# of ':='). This is because TEST_NAME and MAKE_CMD wil use them for each test.
+# Only options are available during runs. Variables are only present in parsing the
+# config file.
+CROSS = alpha-linux
+ARCH = alpha
+
+# arm
+TEST_START IF ${RUN} == arm || ${DO_DEFAULT}
+CROSS = arm-unknown-linux-gnueabi
+ARCH = arm
+
+# black fin
+TEST_START IF ${RUN} == bfin || ${DO_DEFAULT}
+CROSS = bfin-uclinux
+ARCH = blackfin
+BUILD_OPTIONS = -j8 vmlinux
+
+# cris - FAILS?
+TEST_START IF ${RUN} == cris || ${RUN} == cris64 || ${DO_FAILED}
+CROSS = cris-linux
+ARCH = cris
+
+# cris32 - not right arch?
+TEST_START IF ${RUN} == cris || ${RUN} == cris32 || ${DO_FAILED}
+CROSS = crisv32-linux
+ARCH = cris
+
+# ia64
+TEST_START IF ${RUN} == ia64 || ${DO_DEFAULT}
+CROSS = ia64-linux
+ARCH = ia64
+
+# frv
+TEST_START IF ${RUN} == frv || ${DO_FAILED}
+CROSS = frv-linux
+ARCH = frv
+GCC_VER = 4.5.1
+
+# h8300 - failed make defconfig??
+TEST_START IF ${RUN} == h8300 || ${DO_FAILED}
+CROSS = h8300-elf
+ARCH = h8300
+GCC_VER = 4.5.1
+
+# m68k fails with error?
+TEST_START IF ${RUN} == m68k || ${DO_DEFAULT}
+CROSS = m68k-linux
+ARCH = m68k
+
+# mips64
+TEST_START IF ${RUN} == mips || ${RUN} == mips64 || ${DO_DEFAULT}
+CROSS = mips64-linux
+ARCH = mips
+
+# mips32
+TEST_START IF ${RUN} == mips || ${RUN} == mips32 || ${DO_DEFAULT}
+CROSS = mips-linux
+ARCH = mips
+
+# m32r
+TEST_START IF ${RUN} == m32r || ${DO_FAILED}
+CROSS = m32r-linux
+ARCH = m32r
+GCC_VER = 4.5.1
+BUILD_OPTIONS = -j8 vmlinux
+
+# parisc64 failed?
+TEST_START IF ${RUN} == hppa || ${RUN} == hppa64 || ${DO_FAILED}
+CROSS = hppa64-linux
+ARCH = parisc
+
+# parisc
+TEST_START IF ${RUN} == hppa || ${RUN} == hppa32 || ${DO_FAILED}
+CROSS = hppa-linux
+ARCH = parisc
+
+# ppc
+TEST_START IF ${RUN} == ppc || ${RUN} == ppc32 || ${DO_DEFAULT}
+CROSS = powerpc-linux
+ARCH = powerpc
+
+# ppc64
+TEST_START IF ${RUN} == ppc || ${RUN} == ppc64 || ${DO_DEFAULT}
+CROSS = powerpc64-linux
+ARCH = powerpc
+
+# s390
+TEST_START IF ${RUN} == s390 || ${DO_DEFAULT}
+CROSS = s390x-linux
+ARCH = s390
+
+# sh
+TEST_START IF ${RUN} == sh || ${DO_DEFAULT}
+CROSS = sh4-linux
+ARCH = sh
+
+# sparc64
+TEST_START IF ${RUN} == sparc || ${RUN} == sparc64 || ${DO_DEFAULT}
+CROSS = sparc64-linux
+ARCH = sparc64
+
+# sparc
+TEST_START IF ${RUN} == sparc || ${RUN} == sparc32 || ${DO_DEFAULT}
+CROSS = sparc-linux
+ARCH = sparc
+
+# xtensa failed
+TEST_START IF ${RUN} == xtensa || ${DO_FAILED}
+CROSS = xtensa-linux
+ARCH = xtensa
+
+# UML
+TEST_START IF ${RUN} == uml || ${DO_DEFAULT}
+MAKE_CMD = make ARCH=um SUBARCH=x86_64
+ARCH = uml
+CROSS =
+
+TEST_START IF ${RUN} == x86 || ${RUN} == i386 || ${DO_DEFAULT}
+MAKE_CMD = make ARCH=i386
+ARCH = i386
+CROSS = 
+
+TEST_START IF ${RUN} == x86 || ${RUN} == x86_64 || ${DO_DEFAULT}
+MAKE_CMD = make ARCH=x86_64
+ARCH = x86_64
+CROSS = 
+
+#################################
+
+# This is a bisect if needed. You need to give it a MIN_CONFIG that
+# will be the config file it uses. Basically, just copy the created defconfig
+# for the arch someplace and point MIN_CONFIG to it.
+TEST_START IF ${RUN} == bisect
+MIN_CONFIG = ${THIS_DIR}/min-config
+CROSS = s390x-linux
+ARCH = s390
+TEST_TYPE = bisect
+BISECT_TYPE = build
+BISECT_GOOD = v3.1
+BISECT_BAD = v3.2
+CHECKOUT = v3.2
+
+#################################
+
+# These defaults are needed to keep ktest.pl from complaining. They are
+# ignored because the test does not go pass the build. No install or
+# booting of the target images.
+
+DEFAULTS
+MACHINE = crosstest
+SSH_USER = root
+BUILD_TARGET = cross
+TARGET_IMAGE = image
+POWER_CYCLE = cycle
+CONSOLE = console
+LOCALVERSION = version
+GRUB_MENU = grub
+
+REBOOT_ON_ERROR = 0
+POWEROFF_ON_ERROR = 0
+POWEROFF_ON_SUCCESS = 0
+REBOOT_ON_SUCCESS = 0
+
diff --git a/tools/testing/ktest/examples/include/bisect.conf b/tools/testing/ktest/examples/include/bisect.conf
new file mode 100644
index 000000000000..009bea65bfb6
--- /dev/null
+++ b/tools/testing/ktest/examples/include/bisect.conf
@@ -0,0 +1,90 @@
+#
+# This example shows the bisect tests (git bisect and config bisect)
+#
+
+
+# The config that includes this file may define a RUN_TEST
+# variable that will tell this config what test to run.
+# (what to set the TEST option to).
+#
+DEFAULTS IF NOT DEFINED RUN_TEST
+# Requires that hackbench is in the PATH
+RUN_TEST := ${SSH} hackbench 50
+
+
+# Set TEST to 'bisect' to do a normal git bisect. You need
+# to modify the options below to make it bisect the exact
+# commits you are interested in.
+#
+TEST_START IF ${TEST} == bisect
+TEST_TYPE = bisect
+# You must set the commit that was considered good (git bisect good)
+BISECT_GOOD = v3.3
+# You must set the commit that was considered bad (git bisect bad)
+BISECT_BAD = HEAD
+# It's best to specify the branch to checkout before starting the bisect.
+CHECKOUT = origin/master
+# This can be build, boot, or test. Here we are doing a bisect
+# that requires to run a test to know if the bisect was good or bad.
+# The test should exit with 0 on good, non-zero for bad. But see
+# the BISECT_RET_* options in samples.conf to override this.
+BISECT_TYPE = test
+TEST = ${RUN_TEST}
+# It is usually a good idea to confirm that the GOOD and the BAD
+# commits are truly good and bad respectively. Having BISECT_CHECK
+# set to 1 will check both that the good commit works and the bad
+# commit fails. If you only want to check one or the other,
+# set BISECT_CHECK to 'good' or to 'bad'.
+BISECT_CHECK = 1
+#BISECT_CHECK = good
+#BISECT_CHECK = bad
+
+# Usually it's a good idea to specify the exact config you
+# want to use throughout the entire bisect. Here we placed
+# it in the directory we called ktest.pl from and named it
+# 'config-bisect'.
+MIN_CONFIG = ${THIS_DIR}/config-bisect
+# By default, if we are doing a BISECT_TYPE = test run but the
+# build or boot fails, ktest.pl will do a 'git bisect skip'.
+# Uncomment the below option to make ktest stop testing on such
+# an error.
+#BISECT_SKIP = 0
+# Now if you had BISECT_SKIP = 0 and the test fails, you can
+# examine what happened and then do 'git bisect log > /tmp/replay'
+# Set BISECT_REPLAY to /tmp/replay and ktest.pl will run the
+# 'git bisect replay /tmp/replay' before continuing the bisect test.
+#BISECT_REPLAY = /tmp/replay
+# If you used BISECT_REPLAY after the bisect test failed, you may
+# not want to continue the bisect on that commit that failed.
+# By setting BISECT_START to a new commit. ktest.pl will checkout
+# that commit after it has performed the 'git bisect replay' but
+# before it continues running the bisect test.
+#BISECT_START = 2545eb6198e7e1ec50daa0cfc64a4cdfecf24ec9
+
+# Now if you don't trust ktest.pl to make the decisions for you, then
+# set BISECT_MANUAL to 1. This will cause ktest.pl not to decide
+# if the commit was good or bad. Instead, it will ask you to tell
+# it if the current commit was good. In the mean time, you could
+# take the result, load it on any machine you want. Run several tests,
+# or whatever you feel like. Then, when you are happy, you can tell
+# ktest if you think it was good or not and ktest.pl will continue
+# the git bisect. You can even change what commit it is currently at.
+#BISECT_MANUAL = 1
+
+
+# One of the unique tests that ktest does is the config bisect.
+# Currently (which hopefully will be fixed soon), the bad config
+# must be a superset of the good config. This is because it only
+# searches for a config that causes the target to fail. If the
+# good config is not a subset of the bad config, or if the target
+# fails because of a lack of a config, then it will not find
+# the config for you.
+TEST_START IF ${TEST} == config-bisect
+TEST_TYPE = config_bisect
+# set to build, boot, test
+CONFIG_BISECT_TYPE = boot
+# Set the config that is considered bad.
+CONFIG_BISECT = ${THIS_DIR}/config-bad
+# This config is optional. By default it uses the
+# MIN_CONFIG as the good config.
+CONFIG_BISECT_GOOD = ${THIS_DIR}/config-good
diff --git a/tools/testing/ktest/examples/include/defaults.conf b/tools/testing/ktest/examples/include/defaults.conf
new file mode 100644
index 000000000000..323a552ce642
--- /dev/null
+++ b/tools/testing/ktest/examples/include/defaults.conf
@@ -0,0 +1,157 @@
+# This file holds defaults for most the tests. It defines the options that
+# are most common to tests that are likely to be shared.
+#
+# Note, after including this file, a config file may override any option
+# with a DEFAULTS OVERRIDE section.
+#
+
+# For those cases that use the same machine to boot a 64 bit
+# and a 32 bit version. The MACHINE is the DNS name to get to the
+# box (usually different if it was 64 bit or 32 bit) but the
+# BOX here is defined as a variable that will be the name of the box
+# itself. It is useful for calling scripts that will power cycle
+# the box, as only one script needs to be created to power cycle
+# even though the box itself has multiple operating systems on it.
+# By default, BOX and MACHINE are the same.
+
+DEFAULTS IF NOT DEFINED BOX
+BOX := ${MACHINE}
+
+
+# Consider each box as 64 bit box, unless the config including this file
+# has defined BITS = 32
+
+DEFAULTS IF NOT DEFINED BITS
+BITS := 64
+
+
+DEFAULTS
+
+# THIS_DIR is used through out the configs and defaults to ${PWD} which
+# is the directory that ktest.pl was called from.
+
+THIS_DIR := ${PWD}
+
+
+# to orginize your configs, having each machine save their configs
+# into a separate directly is useful.
+CONFIG_DIR := ${THIS_DIR}/configs/${MACHINE}
+
+# Reset the log before running each test.
+CLEAR_LOG = 1
+
+# As installing kernels usually requires root privilege, default the
+# user on the target as root. It is also required that the target
+# allows ssh to root from the host without asking for a password.
+
+SSH_USER = root
+
+# For accesing the machine, we will ssh to root@machine.
+SSH := ssh ${SSH_USER}@${MACHINE}
+
+# Update this. The default here is ktest will ssh to the target box
+# and run a script called 'run-test' located on that box.
+TEST = ${SSH} run-test
+
+# Point build dir to the git repo you use
+BUILD_DIR = ${THIS_DIR}/linux.git
+
+# Each machine will have its own output build directory.
+OUTPUT_DIR = ${THIS_DIR}/build/${MACHINE}
+
+# Yes this config is focused on x86 (but ktest works for other archs too)
+BUILD_TARGET = arch/x86/boot/bzImage
+TARGET_IMAGE = /boot/vmlinuz-test
+
+# have directory for the scripts to reboot and power cycle the boxes
+SCRIPTS_DIR := ${THIS_DIR}/scripts
+
+# You can have each box/machine have a script to power cycle it.
+# Name your script <box>-cycle.
+POWER_CYCLE = ${SCRIPTS_DIR}/${BOX}-cycle
+
+# This script is used to power off the box.
+POWER_OFF = ${SCRIPTS_DIR}/${BOX}-poweroff
+
+# Keep your test kernels separate from your other kernels.
+LOCALVERSION = -test
+
+# The /boot/grub/menu.lst is searched for the line:
+#  title Test Kernel
+# and ktest will use that kernel to reboot into.
+# For grub2 or other boot loaders, you need to set BOOT_TYPE
+# to 'script' and define other ways to load the kernel.
+# See snowball.conf example.
+#
+GRUB_MENU = Test Kernel
+
+# The kernel build will use this option.
+BUILD_OPTIONS = -j8
+
+# Keeping the log file with the output dir is convenient.
+LOG_FILE = ${OUTPUT_DIR}/${MACHINE}.log
+
+# Each box should have their own minum configuration
+# See min-config.conf
+MIN_CONFIG = ${CONFIG_DIR}/config-min
+
+# For things like randconfigs, there may be configs you find that
+# are already broken, or there may be some configs that you always
+# want set. Uncomment ADD_CONFIG and point it to the make config files
+# that set the configs you want to keep on (or off) in your build.
+# ADD_CONFIG is usually something to add configs to all machines,
+# where as, MIN_CONFIG is specific per machine.
+#ADD_CONFIG = ${THIS_DIR}/config-broken ${THIS_DIR}/config-general
+
+# To speed up reboots for bisects and patchcheck, instead of
+# waiting 60 seconds for the console to be idle, if this line is
+# seen in the console output, ktest will know the good kernel has
+# finished rebooting and it will be able to continue the tests.
+REBOOT_SUCCESS_LINE = ${MACHINE} login:
+
+# The following is different ways to end the test.
+# by setting the variable REBOOT to: none, error, fail or
+# something else, ktest will power cycle or reboot the target box
+# at the end of the tests.
+#
+# REBOOT := none
+#   Don't do anything at the end of the test.
+#
+# REBOOT := error
+#   Reboot the box if ktest detects an error
+#
+# REBOOT := fail
+#   Do not stop on failure, and after all tests are complete
+#   power off the box (for both success and error)
+#   This is good to run over a weekend and you don't want to waste
+#   electricity.
+#
+
+DEFAULTS IF ${REBOOT} == none
+REBOOT_ON_SUCCESS = 0
+REBOOT_ON_ERROR = 0
+POWEROFF_ON_ERROR = 0
+POWEROFF_ON_SUCCESS = 0
+
+DEFAULTS ELSE IF ${REBOOT} == error
+REBOOT_ON_SUCCESS = 0
+REBOOT_ON_ERROR = 1
+POWEROFF_ON_ERROR = 0
+POWEROFF_ON_SUCCESS = 0
+
+DEFAULTS ELSE IF ${REBOOT} == fail
+REBOOT_ON_SUCCESS = 0
+POWEROFF_ON_ERROR = 1
+POWEROFF_ON_SUCCESS = 1
+POWEROFF_AFTER_HALT = 120
+DIE_ON_FAILURE = 0
+
+# Store the failure information into this directory
+# such as the .config, dmesg, and build log.
+STORE_FAILURES = ${THIS_DIR}/failures
+
+DEFAULTS ELSE
+REBOOT_ON_SUCCESS = 1
+REBOOT_ON_ERROR = 1
+POWEROFF_ON_ERROR = 0
+POWEROFF_ON_SUCCESS = 0
diff --git a/tools/testing/ktest/examples/include/min-config.conf b/tools/testing/ktest/examples/include/min-config.conf
new file mode 100644
index 000000000000..c703cc46d151
--- /dev/null
+++ b/tools/testing/ktest/examples/include/min-config.conf
@@ -0,0 +1,60 @@
+#
+# This file has some examples for creating a MIN_CONFIG.
+# (A .config file that is the minimum for a machine to boot, or
+#  to boot and make a network connection.)
+#
+# A MIN_CONFIG is very useful as it is the minimum configuration
+# needed to boot a given machine. You can debug someone else's
+# .config by only setting the configs in your MIN_CONFIG. The closer
+# your MIN_CONFIG is to the true minimum set of configs needed to
+# boot your machine, the closer the config you test with will be
+# to the users config that had the failure.
+#
+# The make_min_config test allows you to create a MIN_CONFIG that
+# is truly the minimum set of configs needed to boot a box.
+#
+# In this example, the final config will reside in
+# ${CONFIG_DIR}/config-new-min and ${CONFIG_DIR}/config-new-min-net.
+# Just move one to the location you have set for MIN_CONFIG.
+#
+# The first test creates a MIN_CONFIG that will be the minimum
+# configuration to boot ${MACHINE} and be able to ssh to it.
+#
+# The second test creates a MIN_CONFIG that will only boot
+# the target and most likely will not let you ssh to it. (Notice
+# how the second test uses the first test's result to continue with.
+# This is because the second test config is a subset of the first).
+#
+# The ${CONFIG_DIR}/config-skip (and -net) will hold the configs
+# that ktest.pl found would not boot the target without them set.
+# The config-new-min holds configs that ktest.pl could not test
+# directly because another config that was needed to boot the box
+# selected them. Sometimes it is possible that this file will hold
+# the true minimum configuration. You can test to see if this is
+# the case by running the boot test with BOOT_TYPE = allnoconfig and
+# setting setting the MIN_CONFIG to ${CONFIG_DIR}/config-skip. If the
+# machine still boots, then you can use the config-skip as your MIN_CONFIG.
+#
+# These tests can run for several hours (and perhaps days).
+# It's OK to kill the test with a Ctrl^C. By restarting without
+# modifying this config, ktest.pl will notice that the config-new-min(-net)
+# exists, and will use that instead as the starting point.
+# The USE_OUTPUT_MIN_CONFIG is set to 1 to keep ktest.pl from asking
+# you if you want to use the OUTPUT_MIN_CONFIG as the starting point.
+# By using the OUTPUT_MIN_CONFIG as the starting point will allow ktest.pl to
+# start almost where it left off.
+#
+TEST_START IF ${TEST} == min-config
+TEST_TYPE = make_min_config
+OUTPUT_MIN_CONFIG = ${CONFIG_DIR}/config-new-min-net
+IGNORE_CONFIG = ${CONFIG_DIR}/config-skip-net
+MIN_CONFIG_TYPE = test
+TEST = ${SSH} echo hi
+USE_OUTPUT_MIN_CONFIG = 1
+
+TEST_START IF ${TEST} == min-config && ${MULTI}
+TEST_TYPE = make_min_config
+OUTPUT_MIN_CONFIG = ${CONFIG_DIR}/config-new-min
+IGNORE_CONFIG = ${CONFIG_DIR}/config-skip
+MIN_CONFIG = ${CONFIG_DIR}/config-new-min-net
+USE_OUTPUT_MIN_CONFIG = 1
diff --git a/tools/testing/ktest/examples/include/patchcheck.conf b/tools/testing/ktest/examples/include/patchcheck.conf
new file mode 100644
index 000000000000..339d3e1700ff
--- /dev/null
+++ b/tools/testing/ktest/examples/include/patchcheck.conf
@@ -0,0 +1,74 @@
+# patchcheck.conf
+#
+# This contains a test that takes two git commits and will test each
+# commit between the two. The build test will look at what files the
+# commit has touched, and if any of those files produce a warning, then
+# the build will fail.
+
+
+# PATCH_START is the commit to begin with and PATCH_END is the commit
+# to end with (inclusive). This is similar to doing a git rebase -i PATCH_START~1
+# and then testing each commit and doing a git rebase --continue.
+# You can use a SHA1, a git tag, or anything that git will accept for a checkout
+
+PATCH_START := HEAD~3
+PATCH_END := HEAD
+
+# Change PATCH_CHECKOUT to be the branch you want to test. The test will
+# do a git checkout of this branch before starting. Obviously both
+# PATCH_START and PATCH_END must be in this branch (and PATCH_START must
+# be contained by PATCH_END).
+
+PATCH_CHECKOUT := test/branch
+
+# Usually it's a good idea to have a set config to use for testing individual
+# patches.
+PATCH_CONFIG := ${CONFIG_DIR}/config-patchcheck
+
+# Change PATCH_TEST to run some test for each patch. Each commit that is
+# tested, after it is built and installed on the test machine, this command
+# will be executed. Usually what is done is to ssh to the target box and
+# run some test scripts. If you just want to boot test your patches
+# comment PATCH_TEST out.
+PATCH_TEST := ${SSH} "/usr/local/bin/ktest-test-script"
+
+DEFAULTS IF DEFINED PATCH_TEST
+PATCH_TEST_TYPE := test
+
+DEFAULTS ELSE
+PATCH_TEST_TYPE := boot
+
+# If for some reason a file has a warning that one of your patches touch
+# but you do not care about it, set IGNORE_WARNINGS to that commit(s)
+# (space delimited)
+#IGNORE_WARNINGS = 39eaf7ef884dcc44f7ff1bac803ca2a1dcf43544 6edb2a8a385f0cdef51dae37ff23e74d76d8a6ce
+
+# If you are running a multi test, and the test failed on the first
+# test but on, say the 5th patch. If you want to restart on the
+# fifth patch, set PATCH_START1. This will make the first test start
+# from this commit instead of the PATCH_START commit.
+# Note, do not change this option. Just define PATCH_START1 in the
+# top config (the one you pass to ktest.pl), and this will use it,
+# otherwise it will just use PATCH_START if PATCH_START1 is not defined.
+DEFAULTS IF NOT DEFINED PATCH_START1
+PATCH_START1 := ${PATCH_START}
+
+TEST_START IF ${TEST} == patchcheck
+TEST_TYPE = patchcheck
+MIN_CONFIG = ${PATCH_CONFIG}
+TEST = ${PATCH_TEST}
+PATCHCHECK_TYPE = ${PATCH_TEST_TYPE}
+PATCHCHECK_START = ${PATCH_START1}
+PATCHCHECK_END = ${PATCH_END}
+CHECKOUT = ${PATCH_CHECKOUT}
+
+TEST_START IF ${TEST} == patchcheck && ${MULTI}
+TEST_TYPE = patchcheck
+MIN_CONFIG = ${PATCH_CONFIG}
+TEST = ${PATCH_TEST}
+PATCHCHECK_TYPE = ${PATCH_TEST_TYPE}
+PATCHCHECK_START = ${PATCH_START}
+PATCHCHECK_END = ${PATCH_END}
+CHECKOUT = ${PATCH_CHECKOUT}
+# Use multi to test different compilers?
+MAKE_CMD = CC=gcc-4.5.1 make
diff --git a/tools/testing/ktest/examples/include/tests.conf b/tools/testing/ktest/examples/include/tests.conf
new file mode 100644
index 000000000000..4fdb811bd810
--- /dev/null
+++ b/tools/testing/ktest/examples/include/tests.conf
@@ -0,0 +1,74 @@
+#
+# This is an example of various tests that you can run
+#
+# The variable TEST can be of boot, build, randconfig, or test.
+#
+# Note that TEST is a variable created with ':=' and only exists
+# throughout the config processing (not during the tests itself).
+#
+# The TEST option (defined with '=') is used to tell ktest.pl
+# what test to run after a successful boot. The TEST option is
+# persistent into the test runs.
+#
+
+# The config that includes this file may define a BOOT_TYPE
+# variable that tells this config what type of boot test to run.
+# If it's not defined, the below DEFAULTS will set the default
+# to 'oldconfig'.
+#
+DEFAULTS IF NOT DEFINED BOOT_TYPE
+BOOT_TYPE := oldconfig
+
+# The config that includes this file may define a RUN_TEST
+# variable that will tell this config what test to run.
+# (what to set the TEST option to).
+#
+DEFAULTS IF NOT DEFINED RUN_TEST
+# Requires that hackbench is in the PATH
+RUN_TEST := ${SSH} hackbench 50
+
+
+# If TEST is set to 'boot' then just build a kernel and boot
+# the target.
+TEST_START IF ${TEST} == boot
+TEST_TYPE = boot
+# Notice how we set the BUILD_TYPE option to the BOOT_TYPE variable.
+BUILD_TYPE = ${BOOT_TYPE}
+# Do not do a make mrproper.
+BUILD_NOCLEAN = 1
+
+# If you only want to build the kernel, and perhaps install
+# and test it yourself, then just set TEST to build.
+TEST_START IF ${TEST} == build
+TEST_TYPE = build
+BUILD_TYPE = ${BOOT_TYPE}
+BUILD_NOCLEAN = 1
+
+# Build, install, boot and test with a randconfg 10 times.
+# It is important that you have set MIN_CONFIG in the config
+# that includes this file otherwise it is likely that the
+# randconfig will not have the neccessary configs needed to
+# boot your box. This version of the test requires a min
+# config that has enough to make sure the target has network
+# working.
+TEST_START ITERATE 10 IF ${TEST} == randconfig
+MIN_CONFIG = ${CONFIG_DIR}/config-min-net
+TEST_TYPE = test
+BUILD_TYPE = randconfig
+TEST = ${RUN_TEST}
+
+# This is the same as above, but only tests to a boot prompt.
+# The MIN_CONFIG used here does not need to have networking
+# working.
+TEST_START ITERATE 10 IF ${TEST} == randconfig && ${MULTI}
+TEST_TYPE = boot
+BUILD_TYPE = randconfig
+MIN_CONFIG = ${CONFIG_DIR}/config-min
+MAKE_CMD = make
+
+# This builds, installs, boots and tests the target.
+TEST_START IF ${TEST} == test
+TEST_TYPE = test
+BUILD_TYPE = ${BOOT_TYPE}
+TEST = ${RUN_TEST}
+BUILD_NOCLEAN = 1
diff --git a/tools/testing/ktest/examples/kvm.conf b/tools/testing/ktest/examples/kvm.conf
new file mode 100644
index 000000000000..831c7c5395f1
--- /dev/null
+++ b/tools/testing/ktest/examples/kvm.conf
@@ -0,0 +1,88 @@
+#
+# This config is an example usage of ktest.pl with a kvm guest
+#
+# The guest is called 'Guest' and this would be something that
+# could be run on the host to test a virtual machine target.
+
+MACHINE = Guest
+
+
+# Use virsh to read the serial console of the guest
+CONSOLE =  virsh console ${MACHINE}
+
+#*************************************#
+# This part is the same as test.conf  #
+#*************************************#
+
+# The include files will set up the type of test to run. Just set TEST to
+# which test you want to run.
+#
+# TESTS = patchcheck, randconfig, boot, test, config-bisect, bisect, min-config
+#
+# See the include/*.conf files that define these tests
+#
+TEST := patchcheck
+
+# Some tests may have more than one test to run. Define MULTI := 1 to run
+# the extra tests.
+MULTI := 0
+
+# In case you want to differentiate which type of system you are testing
+BITS := 64
+
+# REBOOT = none, error, fail, empty
+#  See include/defaults.conf
+REBOOT := empty
+
+
+# The defaults file will set up various settings that can be used by all
+# machine configs.
+INCLUDE include/defaults.conf
+
+
+#*************************************#
+# Now we are different from test.conf #
+#*************************************#
+
+
+# The example here assumes that Guest is running a Fedora release
+# that uses dracut for its initfs. The POST_INSTALL will be executed
+# after the install of the kernel and modules are complete.
+#
+POST_INSTALL = ${SSH} /sbin/dracut -f /boot/initramfs-test.img $KERNEL_VERSION
+
+# Guests sometimes get stuck on reboot. We wait 3 seconds after running
+# the reboot command and then  do a full power-cycle of the guest.
+# This forces the guest to restart.
+#
+POWERCYCLE_AFTER_REBOOT = 3
+
+# We do the same after the halt command, but this time we wait 20 seconds.
+POWEROFF_AFTER_HALT = 20
+
+
+# As the defaults.conf file has a POWER_CYCLE option already defined,
+# and options can not be defined in the same section more than once
+# (all DEFAULTS sections are considered the same). We use the
+# DEFAULTS OVERRIDE to tell ktest.pl to ignore the previous defined
+# options, for the options set in the OVERRIDE section.
+#
+DEFAULTS OVERRIDE
+
+# Instead of using the default POWER_CYCLE option defined in
+# defaults.conf, we use virsh to cycle it. To do so, we destroy
+# the guest, wait 5 seconds, and then start it up again.
+# Crude, but effective.
+#
+POWER_CYCLE = virsh destroy ${MACHINE}; sleep 5; virsh start ${MACHINE}
+
+
+DEFAULTS
+
+# The following files each handle a different test case.
+# Having them included allows you to set up more than one machine and share
+# the same tests.
+INCLUDE include/patchcheck.conf
+INCLUDE include/tests.conf
+INCLUDE include/bisect.conf
+INCLUDE include/min-config.conf
diff --git a/tools/testing/ktest/examples/snowball.conf b/tools/testing/ktest/examples/snowball.conf
new file mode 100644
index 000000000000..a82a3c5bc2b7
--- /dev/null
+++ b/tools/testing/ktest/examples/snowball.conf
@@ -0,0 +1,53 @@
+# This example was used to boot the snowball ARM board.
+# See http://people.redhat.com/srostedt/ktest-embedded-2012/
+
+# PWD is a ktest.pl variable that will result in the process working
+# directory that ktest.pl is executed in.
+
+# THIS_DIR is automatically assigned the PWD of the path that generated
+# the config file. It is best to use this variable when assigning other
+# directory paths within this directory. This allows you to easily
+# move the test cases to other locations or to other machines.
+#
+THIS_DIR := /home/rostedt/work/demo/ktest-embed
+LOG_FILE = ${OUTPUT_DIR}/snowball.log
+CLEAR_LOG = 1
+MAKE_CMD = PATH=/usr/local/gcc-4.5.2-nolibc/arm-unknown-linux-gnueabi/bin:$PATH CROSS_COMPILE=arm-unknown-linux-gnueabi- make ARCH=arm
+ADD_CONFIG = ${THIS_DIR}/addconfig
+
+SCP_TO_TARGET = echo "don't do scp"
+
+TFTPBOOT := /var/lib/tftpboot
+TFTPDEF := ${TFTPBOOT}/snowball-default
+TFTPTEST := ${OUTPUT_DIR}/${BUILD_TARGET}
+
+SWITCH_TO_GOOD = cp ${TFTPDEF} ${TARGET_IMAGE}
+SWITCH_TO_TEST = cp ${TFTPTEST} ${TARGET_IMAGE}
+
+# Define each test with TEST_START
+# The config options below it will override the defaults
+TEST_START SKIP
+TEST_TYPE = boot
+BUILD_TYPE = u8500_defconfig
+BUILD_NOCLEAN = 1
+
+TEST_START
+TEST_TYPE = make_min_config
+OUTPUT_MIN_CONFIG = ${THIS_DIR}/config.newmin
+START_MIN_CONFIG = ${THIS_DIR}/config.orig
+IGNORE_CONFIG = ${THIS_DIR}/config.ignore
+BUILD_NOCLEAN = 1
+
+
+DEFAULTS
+LOCALVERSION = -test
+POWER_CYCLE = echo use the thumb luke; read a
+CONSOLE = cat ${THIS_DIR}/snowball-cat
+REBOOT_TYPE = script
+SSH_USER = root
+BUILD_OPTIONS = -j8 uImage
+BUILD_DIR = ${THIS_DIR}/linux.git
+OUTPUT_DIR = ${THIS_DIR}/snowball-build
+MACHINE = snowball
+TARGET_IMAGE = /var/lib/tftpboot/snowball-image
+BUILD_TARGET = arch/arm/boot/uImage
diff --git a/tools/testing/ktest/examples/test.conf b/tools/testing/ktest/examples/test.conf
new file mode 100644
index 000000000000..b725210efb7f
--- /dev/null
+++ b/tools/testing/ktest/examples/test.conf
@@ -0,0 +1,62 @@
+#
+# Generic config for a machine
+#
+
+# Name your machine (the DNS name, what you ssh to)
+MACHINE = foo
+
+# BOX can be different than foo, if the machine BOX has
+# multiple partitions with different systems installed. For example,
+# you may have a i386 and x86_64 installation on a test box.
+# If this is the case, MACHINE defines the way to connect to the
+# machine, which may be different between which system the machine
+# is booting into. BOX is used for the scripts to reboot and power cycle
+# the machine, where it does not matter which system the machine boots into.
+#
+#BOX := bar
+
+# Define a way to read the console
+CONSOLE = stty -F /dev/ttyS0 115200 parodd; cat /dev/ttyS0
+
+# The include files will set up the type of test to run. Just set TEST to
+# which test you want to run.
+#
+# TESTS = patchcheck, randconfig, boot, test, config-bisect, bisect, min-config
+#
+# See the include/*.conf files that define these tests
+#
+TEST := patchcheck
+
+# Some tests may have more than one test to run. Define MULTI := 1 to run
+# the extra tests.
+MULTI := 0
+
+# In case you want to differentiate which type of system you are testing
+BITS := 64
+
+# REBOOT = none, error, fail, empty
+#  See include/defaults.conf
+REBOOT := empty
+
+# The defaults file will set up various settings that can be used by all
+# machine configs.
+INCLUDE include/defaults.conf
+
+# In case you need to add a patch for a bisect or something
+#PRE_BUILD = patch -p1 < ${THIS_DIR}/fix.patch
+
+# Reset the repo after the build and remove all 'test' modules from the target
+# Notice that DO_POST_BUILD is a variable (defined by ':=') and POST_BUILD
+# is the option (defined by '=')
+
+DO_POST_BUILD := git reset --hard
+POST_BUILD = ${SSH} 'rm -rf /lib/modules/*-test*'; ${DO_POST_BUILD}
+
+# The following files each handle a different test case.
+# Having them included allows you to set up more than one machine and share
+# the same tests.
+INCLUDE include/patchcheck.conf
+INCLUDE include/tests.conf
+INCLUDE include/bisect.conf
+INCLUDE include/min-config.conf
+
diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index 4915408f6a98..292b13ad03f5 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -39,6 +39,7 @@ my %default = (
     "CLEAR_LOG"                 => 0,
     "BISECT_MANUAL"             => 0,
     "BISECT_SKIP"               => 1,
+    "MIN_CONFIG_TYPE"           => "boot",
     "SUCCESS_LINE"              => "login:",
     "DETECT_TRIPLE_FAULT"       => 1,
     "NO_INSTALL"                => 0,
@@ -66,6 +67,7 @@ my %default = (
 
 my $ktest_config;
 my $version;
+my $have_version = 0;
 my $machine;
 my $ssh_user;
 my $tmpdir;
@@ -106,6 +108,8 @@ my $minconfig;
 my $start_minconfig;
 my $start_minconfig_defined;
 my $output_minconfig;
+my $minconfig_type;
+my $use_output_minconfig;
 my $ignore_config;
 my $ignore_errors;
 my $addconfig;
@@ -205,6 +209,8 @@ my %option_map = (
     "MIN_CONFIG"                => \$minconfig,
     "OUTPUT_MIN_CONFIG"         => \$output_minconfig,
     "START_MIN_CONFIG"          => \$start_minconfig,
+    "MIN_CONFIG_TYPE"           => \$minconfig_type,
+    "USE_OUTPUT_MIN_CONFIG"     => \$use_output_minconfig,
     "IGNORE_CONFIG"             => \$ignore_config,
     "TEST"                      => \$run_test,
     "ADD_CONFIG"                => \$addconfig,
@@ -1702,10 +1708,12 @@ sub install {
 
 sub get_version {
     # get the release name
+    return if ($have_version);
     doprint "$make kernelrelease ... ";
     $version = `$make kernelrelease | tail -1`;
     chomp($version);
     doprint "$version\n";
+    $have_version = 1;
 }
 
 sub start_monitor_and_boot {
@@ -1828,6 +1836,9 @@ sub build {
     my $save_no_reboot = $no_reboot;
     $no_reboot = 1;
 
+    # Calculate a new version from here.
+    $have_version = 0;
+
     if (defined($pre_build)) {
         my $ret = run_command $pre_build;
         if (!$ret && defined($pre_build_die) &&
@@ -1887,6 +1898,9 @@ sub build {
     undef $redirect;
 
     if (defined($post_build)) {
+        # Because a post build may change the kernel version
+        # do it now.
+        get_version;
         my $ret = run_command $post_build;
         if (!$ret && defined($post_build_die) &&
             $post_build_die) {
@@ -3119,6 +3133,12 @@ sub test_this_config {
 sub make_min_config {
     my ($i) = @_;
 
+    my $type = $minconfig_type;
+    if ($type ne "boot" && $type ne "test") {
+        fail "Invalid MIN_CONFIG_TYPE '$minconfig_type'\n" .
+            " make_min_config works only with 'boot' and 'test'\n" and return;
+    }
+
     if (!defined($output_minconfig)) {
         fail "OUTPUT_MIN_CONFIG not defined" and return;
     }
@@ -3128,8 +3148,15 @@ sub make_min_config {
     # that instead.
     if (-f $output_minconfig && !$start_minconfig_defined) {
         print "$output_minconfig exists\n";
-        if (read_yn " Use it as minconfig?") {
+        if (!defined($use_output_minconfig)) {
+            if (read_yn " Use it as minconfig?") {
+                $start_minconfig = $output_minconfig;
+            }
+        } elsif ($use_output_minconfig > 0) {
+            doprint "Using $output_minconfig as MIN_CONFIG\n";
             $start_minconfig = $output_minconfig;
+        } else {
+            doprint "Set to still use MIN_CONFIG as starting point\n";
         }
     }
 
@@ -3278,6 +3305,11 @@ sub make_min_config {
         build "oldconfig" or $failed = 1;
         if (!$failed) {
                 start_monitor_and_boot or $failed = 1;
+
+                if ($type eq "test" && !$failed) {
+                    do_run_test or $failed = 1;
+                }
+
                 end_monitor;
         }
 
@@ -3474,6 +3506,8 @@ for (my $i = 1; $i <= $opt{"NUM_TESTS"}; $i++) {
     $no_reboot = 1;
     $reboot_success = 0;
 
+    $have_version = 0;
+
     $iteration = $i;
 
     my $makecmd = set_test_option("MAKE_CMD", $i);
diff --git a/tools/testing/ktest/sample.conf b/tools/testing/ktest/sample.conf
index b682456afda8..cf362b3d1ec9 100644
--- a/tools/testing/ktest/sample.conf
+++ b/tools/testing/ktest/sample.conf
@@ -158,7 +158,7 @@
 #
 # TEST_START IF (DEFINED ALL_TESTS || ${MYTEST} == boottest) && ${MACHINE} == gandalf
 #
-# Notice the use of paranthesis. Without any paranthesis the above would be
+# Notice the use of parentheses. Without any parentheses the above would be
 # processed the same as:
 #
 # TEST_START IF DEFINED ALL_TESTS || (${MYTEST} == boottest && ${MACHINE} == gandalf)
@@ -1105,10 +1105,26 @@
 #   and will not be tested again in later runs.
 #   (optional)
 #
+#  MIN_CONFIG_TYPE can be either 'boot' or 'test'. With 'boot' it will
+#   test if the created config can just boot the machine. If this is
+#   set to 'test', then the TEST option must be defined and the created
+#   config will not only boot the target, but also make sure that the
+#   config lets the test succeed. This is useful to make sure the final
+#   config that is generated allows network activity (ssh).
+#   (optional)
+#
+#  USE_OUTPUT_MIN_CONFIG set this to 1 if you do not want to be prompted
+#   about using the OUTPUT_MIN_CONFIG as the MIN_CONFIG as the starting
+#   point. Set it to 0 if you want to always just use the given MIN_CONFIG.
+#   If it is not defined, it will prompt you to pick which config
+#   to start with (MIN_CONFIG or OUTPUT_MIN_CONFIG).
+#
 # Example:
 #
 #  TEST_TYPE = make_min_config
 #  OUTPUT_MIN_CONFIG = /path/to/config-new-min
 #  START_MIN_CONFIG = /path/to/config-min
 #  IGNORE_CONFIG = /path/to/config-tested
+#  MIN_CONFIG_TYPE = test
+#  TEST = ssh ${USER}@${MACHINE} echo hi
 #
diff --git a/tools/usb/ffs-test.c b/tools/usb/ffs-test.c
index 4b107b5e623f..8674b9ec14f6 100644
--- a/tools/usb/ffs-test.c
+++ b/tools/usb/ffs-test.c
@@ -297,7 +297,7 @@ static void *start_thread_helper(void *arg)
 
                 ret = t->in(t, t->buf, t->buf_size);
                 if (ret > 0) {
-                        ret = t->out(t, t->buf, t->buf_size);
+                        ret = t->out(t, t->buf, ret);
                         name = out_name;
                         op = "write";
                 } else {
diff --git a/tools/usb/testusb.c b/tools/usb/testusb.c
index 6e0f56701e44..82d7c590c026 100644
--- a/tools/usb/testusb.c
+++ b/tools/usb/testusb.c
@@ -358,6 +358,7 @@ static const char *usbfs_dir_find(void)
 {
         static char usbfs_path_0[] = "/dev/usb/devices";
         static char usbfs_path_1[] = "/proc/bus/usb/devices";
+        static char udev_usb_path[] = "/dev/bus/usb";
 
         static char *const usbfs_paths[] = {
                 usbfs_path_0, usbfs_path_1
@@ -376,6 +377,10 @@ static const char *usbfs_dir_find(void)
                 }
         } while (++it != end);
 
+        /* real device-nodes managed by udev */
+        if (access(udev_usb_path, F_OK) == 0)
+                return udev_usb_path;
+
         return NULL;
 }
 
diff --git a/tools/virtio/linux/virtio.h b/tools/virtio/linux/virtio.h
index 7579f19e61e0..81847dd08bd0 100644
--- a/tools/virtio/linux/virtio.h
+++ b/tools/virtio/linux/virtio.h
@@ -203,6 +203,7 @@ void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
 void virtqueue_disable_cb(struct virtqueue *vq);
 
 bool virtqueue_enable_cb(struct virtqueue *vq);
+bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
 
 void *virtqueue_detach_unused_buf(struct virtqueue *vq);
 struct virtqueue *vring_new_virtqueue(unsigned int num,
diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index 6bf95f995364..e626fa553c5a 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -144,7 +144,8 @@ static void wait_for_interrupt(struct vdev_info *dev)
                 }
 }
 
-static void run_test(struct vdev_info *dev, struct vq_info *vq, int bufs)
+static void run_test(struct vdev_info *dev, struct vq_info *vq,
+                     bool delayed, int bufs)
 {
         struct scatterlist sl;
         long started = 0, completed = 0;
@@ -183,8 +184,12 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq, int bufs)
                 assert(started <= bufs);
                 if (completed == bufs)
                         break;
-                if (virtqueue_enable_cb(vq->vq)) {
-                        wait_for_interrupt(dev);
+                if (delayed) {
+                        if (virtqueue_enable_cb_delayed(vq->vq))
+                                wait_for_interrupt(dev);
+                } else {
+                        if (virtqueue_enable_cb(vq->vq))
+                                wait_for_interrupt(dev);
                 }
         }
         test = 0;
@@ -216,6 +221,14 @@ const struct option longopts[] = {
                 .val = 'i',
         },
         {
+                .name = "delayed-interrupt",
+                .val = 'D',
+        },
+        {
+                .name = "no-delayed-interrupt",
+                .val = 'd',
+        },
+        {
         }
 };
 
@@ -224,6 +237,7 @@ static void help()
         fprintf(stderr, "Usage: virtio_test [--help]"
                 " [--no-indirect]"
                 " [--no-event-idx]"
+                " [--delayed-interrupt]"
                 "\n");
 }
 
@@ -233,6 +247,7 @@ int main(int argc, char **argv)
         unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
                 (1ULL << VIRTIO_RING_F_EVENT_IDX);
         int o;
+        bool delayed = false;
 
         for (;;) {
                 o = getopt_long(argc, argv, optstring, longopts, NULL);
@@ -251,6 +266,9 @@ int main(int argc, char **argv)
                 case 'i':
                         features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
                         break;
+                case 'D':
+                        delayed = true;
+                        break;
                 default:
                         assert(0);
                         break;
@@ -260,6 +278,6 @@ int main(int argc, char **argv)
 done:
         vdev_info_init(&dev, features);
         vq_info_add(&dev, 256);
-        run_test(&dev, &dev.vqs[0], 0x100000);
+        run_test(&dev, &dev.vqs[0], delayed, 0x100000);
         return 0;
 }