kmemcheck: rip it out

Fix up makefiles, remove references, and git rm kmemcheck.

Link: http://lkml.kernel.org/r/20171007030159.22241-4-alexander.levin@verizon.com
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Vegard Nossum <vegardno@ifi.uio.no>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Tim Hansen <devtimhansen@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 2 insertions, 98 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 07ce7449765a..5402e3954659 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -504,7 +504,7 @@ config DEBUG_OBJECTS_ENABLE_DEFAULT
 
 config DEBUG_SLAB
         bool "Debug slab memory allocations"
-        depends on DEBUG_KERNEL && SLAB && !KMEMCHECK
+        depends on DEBUG_KERNEL && SLAB
         help
           Say Y here to have the kernel do limited verification on memory
           allocation as well as poisoning memory on free to catch use of freed
@@ -516,7 +516,7 @@ config DEBUG_SLAB_LEAK
 
 config SLUB_DEBUG_ON
         bool "SLUB debugging on by default"
-        depends on SLUB && SLUB_DEBUG && !KMEMCHECK
+        depends on SLUB && SLUB_DEBUG
         default n
         help
           Boot with debugging on by default. SLUB boots by default with
@@ -730,8 +730,6 @@ config DEBUG_STACKOVERFLOW
 
           If in doubt, say "N".
 
-source "lib/Kconfig.kmemcheck"
-
 source "lib/Kconfig.kasan"
 
 endmenu # "Memory Debugging"
diff --git a/lib/Kconfig.kmemcheck b/lib/Kconfig.kmemcheck
deleted file mode 100644
index 846e039a86b4..000000000000
--- a/lib/Kconfig.kmemcheck
+++ /dev/null
@@ -1,94 +0,0 @@
-config HAVE_ARCH_KMEMCHECK
-        bool
-
-if HAVE_ARCH_KMEMCHECK
-
-menuconfig KMEMCHECK
-        bool "kmemcheck: trap use of uninitialized memory"
-        depends on DEBUG_KERNEL
-        depends on !X86_USE_3DNOW
-        depends on SLUB || SLAB
-        depends on !CC_OPTIMIZE_FOR_SIZE
-        depends on !FUNCTION_TRACER
-        select FRAME_POINTER
-        select STACKTRACE
-        default n
-        help
-          This option enables tracing of dynamically allocated kernel memory
-          to see if memory is used before it has been given an initial value.
-          Be aware that this requires half of your memory for bookkeeping and
-          will insert extra code at *every* read and write to tracked memory
-          thus slow down the kernel code (but user code is unaffected).
-
-          The kernel may be started with kmemcheck=0 or kmemcheck=1 to disable
-          or enable kmemcheck at boot-time. If the kernel is started with
-          kmemcheck=0, the large memory and CPU overhead is not incurred.
-
-choice
-        prompt "kmemcheck: default mode at boot"
-        depends on KMEMCHECK
-        default KMEMCHECK_ONESHOT_BY_DEFAULT
-        help
-          This option controls the default behaviour of kmemcheck when the
-          kernel boots and no kmemcheck= parameter is given.
-
-config KMEMCHECK_DISABLED_BY_DEFAULT
-        bool "disabled"
-        depends on KMEMCHECK
-
-config KMEMCHECK_ENABLED_BY_DEFAULT
-        bool "enabled"
-        depends on KMEMCHECK
-
-config KMEMCHECK_ONESHOT_BY_DEFAULT
-        bool "one-shot"
-        depends on KMEMCHECK
-        help
-          In one-shot mode, only the first error detected is reported before
-          kmemcheck is disabled.
-
-endchoice
-
-config KMEMCHECK_QUEUE_SIZE
-        int "kmemcheck: error queue size"
-        depends on KMEMCHECK
-        default 64
-        help
-          Select the maximum number of errors to store in the queue. Since
-          errors can occur virtually anywhere and in any context, we need a
-          temporary storage area which is guarantueed not to generate any
-          other faults. The queue will be emptied as soon as a tasklet may
-          be scheduled. If the queue is full, new error reports will be
-          lost.
-
-config KMEMCHECK_SHADOW_COPY_SHIFT
-        int "kmemcheck: shadow copy size (5 => 32 bytes, 6 => 64 bytes)"
-        depends on KMEMCHECK
-        range 2 8
-        default 5
-        help
-          Select the number of shadow bytes to save along with each entry of
-          the queue. These bytes indicate what parts of an allocation are
-          initialized, uninitialized, etc. and will be displayed when an
-          error is detected to help the debugging of a particular problem.
-
-config KMEMCHECK_PARTIAL_OK
-        bool "kmemcheck: allow partially uninitialized memory"
-        depends on KMEMCHECK
-        default y
-        help
-          This option works around certain GCC optimizations that produce
-          32-bit reads from 16-bit variables where the upper 16 bits are
-          thrown away afterwards. This may of course also hide some real
-          bugs.
-
-config KMEMCHECK_BITOPS_OK
-        bool "kmemcheck: allow bit-field manipulation"
-        depends on KMEMCHECK
-        default n
-        help
-          This option silences warnings that would be generated for bit-field
-          accesses where not all the bits are initialized at the same time.
-          This may also hide some real bugs.
-
-endif