6 files changed, 176 insertions, 189 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 0796c1a090c0..95de3102bc87 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -211,7 +211,7 @@ config SLUB_DEBUG_ON
 config SLUB_STATS
         default n
         bool "Enable SLUB performance statistics"
-        depends on SLUB
+        depends on SLUB && SLUB_DEBUG && SYSFS
         help
           SLUB statistics are useful to debug SLUBs allocation behavior in
           order find ways to optimize the allocator. This should never be
@@ -265,16 +265,6 @@ config DEBUG_MUTEXES
          This feature allows mutex semantics violations to be detected and
          reported.
 
-config DEBUG_SEMAPHORE
-        bool "Semaphore debugging"
-        depends on DEBUG_KERNEL
-        depends on ALPHA || FRV
-        default n
-        help
-          If you say Y here then semaphore processing will issue lots of
-          verbose debugging messages.  If you suspect a semaphore problem or a
-          kernel hacker asks for this option then say Y.  Otherwise say N.
-
 config DEBUG_LOCK_ALLOC
         bool "Lock debugging: detect incorrect freeing of live locks"
         depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
@@ -593,7 +583,7 @@ config LATENCYTOP
           to find out which userspace is blocking on what kernel operations.
 
 config PROVIDE_OHCI1394_DMA_INIT
-        bool "Provide code for enabling DMA over FireWire early on boot"
+        bool "Remote debugging over FireWire early on boot"
         depends on PCI && X86
         help
           If you want to debug problems which hang or crash the kernel early
@@ -621,4 +611,17 @@ config PROVIDE_OHCI1394_DMA_INIT
 
           See Documentation/debugging-via-ohci1394.txt for more information.
 
+config FIREWIRE_OHCI_REMOTE_DMA
+        bool "Remote debugging over FireWire with firewire-ohci"
+        depends on FIREWIRE_OHCI
+        help
+          This option lets you use the FireWire bus for remote debugging
+          with help of the firewire-ohci driver. It enables unfiltered
+          remote DMA in firewire-ohci.
+          See Documentation/debugging-via-ohci1394.txt for more information.
+
+          If unsure, say N.
+
 source "samples/Kconfig"
+
+source "lib/Kconfig.kgdb"
diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
new file mode 100644
index 000000000000..f2e01ac5ab09
--- /dev/null
+++ b/lib/Kconfig.kgdb
@@ -0,0 +1,58 @@
+
+menuconfig KGDB
+        bool "KGDB: kernel debugging with remote gdb"
+        select FRAME_POINTER
+        depends on HAVE_ARCH_KGDB
+        depends on DEBUG_KERNEL && EXPERIMENTAL
+        help
+          If you say Y here, it will be possible to remotely debug the
+          kernel using gdb.  Documentation of kernel debugger is available
+          at http://kgdb.sourceforge.net as well as in DocBook form
+          in Documentation/DocBook/.  If unsure, say N.
+
+config HAVE_ARCH_KGDB_SHADOW_INFO
+        bool
+
+config HAVE_ARCH_KGDB
+        bool
+
+config KGDB_SERIAL_CONSOLE
+        tristate "KGDB: use kgdb over the serial console"
+        depends on KGDB
+        select CONSOLE_POLL
+        select MAGIC_SYSRQ
+        default y
+        help
+          Share a serial console with kgdb. Sysrq-g must be used
+          to break in initially.
+
+config KGDB_TESTS
+        bool "KGDB: internal test suite"
+        depends on KGDB
+        default n
+        help
+          This is a kgdb I/O module specifically designed to test
+          kgdb's internal functions.  This kgdb I/O module is
+          intended to for the development of new kgdb stubs
+          as well as regression testing the kgdb internals.
+          See the drivers/misc/kgdbts.c for the details about
+          the tests.  The most basic of this I/O module is to boot
+          a kernel boot arguments "kgdbwait kgdbts=V1F100"
+
+config KGDB_TESTS_ON_BOOT
+        bool "KGDB: Run tests on boot"
+        depends on KGDB_TESTS
+        default n
+        help
+          Run the kgdb tests on boot up automatically without the need
+          to pass in a kernel parameter
+
+config KGDB_TESTS_BOOT_STRING
+        string "KGDB: which internal kgdb tests to run"
+        depends on KGDB_TESTS_ON_BOOT
+        default "V1F100"
+        help
+          This is the command string to send the kgdb test suite on
+          boot.  See the drivers/misc/kgdbts.c for detailed
+          information about other strings you could use beyond the
+          default of V1F100.
diff --git a/lib/Makefile b/lib/Makefile
index 4d059d469554..4d7649c326f6 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -29,7 +29,6 @@ obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o
 obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o
 lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
 lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o
-lib-$(CONFIG_SEMAPHORE_SLEEPERS) += semaphore-sleepers.o
 lib-$(CONFIG_GENERIC_FIND_NEXT_BIT) += find_next_bit.o
 obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o
 obj-$(CONFIG_LOCK_KERNEL) += kernel_lock.o
diff --git a/lib/kernel_lock.c b/lib/kernel_lock.c
index 812dbf00844b..fbc11a336bc5 100644
--- a/lib/kernel_lock.c
+++ b/lib/kernel_lock.c
@@ -8,6 +8,7 @@
 #include <linux/smp_lock.h>
 #include <linux/module.h>
 #include <linux/kallsyms.h>
+#include <asm/semaphore.h>
 
 /*
  * The 'big kernel semaphore'
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index acca4901046c..b80c21100d78 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -8,6 +8,7 @@
  */
 #include <linux/module.h>
 #include <linux/scatterlist.h>
+#include <linux/highmem.h>
 
 /**
  * sg_next - return the next scatterlist entry in a list
@@ -292,3 +293,104 @@ int sg_alloc_table(struct sg_table *table, unsigned int nents, gfp_t gfp_mask)
         return ret;
 }
 EXPORT_SYMBOL(sg_alloc_table);
+
+/**
+ * sg_copy_buffer - Copy data between a linear buffer and an SG list
+ * @sgl:                 The SG list
+ * @nents:               Number of SG entries
+ * @buf:                 Where to copy from
+ * @buflen:              The number of bytes to copy
+ * @to_buffer:           transfer direction (non zero == from an sg list to a
+ *                       buffer, 0 == from a buffer to an sg list
+ *
+ * Returns the number of copied bytes.
+ *
+ **/
+static size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents,
+                             void *buf, size_t buflen, int to_buffer)
+{
+        struct scatterlist *sg;
+        size_t buf_off = 0;
+        int i;
+
+        WARN_ON(!irqs_disabled());
+
+        for_each_sg(sgl, sg, nents, i) {
+                struct page *page;
+                int n = 0;
+                unsigned int sg_off = sg->offset;
+                unsigned int sg_copy = sg->length;
+
+                if (sg_copy > buflen)
+                        sg_copy = buflen;
+                buflen -= sg_copy;
+
+                while (sg_copy > 0) {
+                        unsigned int page_copy;
+                        void *p;
+
+                        page_copy = PAGE_SIZE - sg_off;
+                        if (page_copy > sg_copy)
+                                page_copy = sg_copy;
+
+                        page = nth_page(sg_page(sg), n);
+                        p = kmap_atomic(page, KM_BIO_SRC_IRQ);
+
+                        if (to_buffer)
+                                memcpy(buf + buf_off, p + sg_off, page_copy);
+                        else {
+                                memcpy(p + sg_off, buf + buf_off, page_copy);
+                                flush_kernel_dcache_page(page);
+                        }
+
+                        kunmap_atomic(p, KM_BIO_SRC_IRQ);
+
+                        buf_off += page_copy;
+                        sg_off += page_copy;
+                        if (sg_off == PAGE_SIZE) {
+                                sg_off = 0;
+                                n++;
+                        }
+                        sg_copy -= page_copy;
+                }
+
+                if (!buflen)
+                        break;
+        }
+
+        return buf_off;
+}
+
+/**
+ * sg_copy_from_buffer - Copy from a linear buffer to an SG list
+ * @sgl:                 The SG list
+ * @nents:               Number of SG entries
+ * @buf:                 Where to copy from
+ * @buflen:              The number of bytes to copy
+ *
+ * Returns the number of copied bytes.
+ *
+ **/
+size_t sg_copy_from_buffer(struct scatterlist *sgl, unsigned int nents,
+                           void *buf, size_t buflen)
+{
+        return sg_copy_buffer(sgl, nents, buf, buflen, 0);
+}
+EXPORT_SYMBOL(sg_copy_from_buffer);
+
+/**
+ * sg_copy_to_buffer - Copy from an SG list to a linear buffer
+ * @sgl:                 The SG list
+ * @nents:               Number of SG entries
+ * @buf:                 Where to copy to
+ * @buflen:              The number of bytes to copy
+ *
+ * Returns the number of copied bytes.
+ *
+ **/
+size_t sg_copy_to_buffer(struct scatterlist *sgl, unsigned int nents,
+                         void *buf, size_t buflen)
+{
+        return sg_copy_buffer(sgl, nents, buf, buflen, 1);
+}
+EXPORT_SYMBOL(sg_copy_to_buffer);
diff --git a/lib/semaphore-sleepers.c b/lib/semaphore-sleepers.c
deleted file mode 100644
index 0198782cdacb..000000000000
--- a/lib/semaphore-sleepers.c
+++ /dev/null
@@ -1,176 +0,0 @@
-/*
- * i386 and x86-64 semaphore implementation.
- *
- * (C) Copyright 1999 Linus Torvalds
- *
- * Portions Copyright 1999 Red Hat, Inc.
- *
- *      This program is free software; you can redistribute it and/or
- *      modify it under the terms of the GNU General Public License
- *      as published by the Free Software Foundation; either version
- *      2 of the License, or (at your option) any later version.
- *
- * rw semaphores implemented November 1999 by Benjamin LaHaise <bcrl@kvack.org>
- */
-#include <linux/sched.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <asm/semaphore.h>
-
-/*
- * Semaphores are implemented using a two-way counter:
- * The "count" variable is decremented for each process
- * that tries to acquire the semaphore, while the "sleeping"
- * variable is a count of such acquires.
- *
- * Notably, the inline "up()" and "down()" functions can
- * efficiently test if they need to do any extra work (up
- * needs to do something only if count was negative before
- * the increment operation.
- *
- * "sleeping" and the contention routine ordering is protected
- * by the spinlock in the semaphore's waitqueue head.
- *
- * Note that these functions are only called when there is
- * contention on the lock, and as such all this is the
- * "non-critical" part of the whole semaphore business. The
- * critical part is the inline stuff in <asm/semaphore.h>
- * where we want to avoid any extra jumps and calls.
- */
-
-/*
- * Logic:
- *  - only on a boundary condition do we need to care. When we go
- *    from a negative count to a non-negative, we wake people up.
- *  - when we go from a non-negative count to a negative do we
- *    (a) synchronize with the "sleeper" count and (b) make sure
- *    that we're on the wakeup list before we synchronize so that
- *    we cannot lose wakeup events.
- */
-
-void __up(struct semaphore *sem)
-{
-        wake_up(&sem->wait);
-}
-
-void __sched __down(struct semaphore *sem)
-{
-        struct task_struct *tsk = current;
-        DECLARE_WAITQUEUE(wait, tsk);
-        unsigned long flags;
-
-        tsk->state = TASK_UNINTERRUPTIBLE;
-        spin_lock_irqsave(&sem->wait.lock, flags);
-        add_wait_queue_exclusive_locked(&sem->wait, &wait);
-
-        sem->sleepers++;
-        for (;;) {
-                int sleepers = sem->sleepers;
-
-                /*
-                 * Add "everybody else" into it. They aren't
-                 * playing, because we own the spinlock in
-                 * the wait_queue_head.
-                 */
-                if (!atomic_add_negative(sleepers - 1, &sem->count)) {
-                        sem->sleepers = 0;
-                        break;
-                }
-                sem->sleepers = 1;      /* us - see -1 above */
-                spin_unlock_irqrestore(&sem->wait.lock, flags);
-
-                schedule();
-
-                spin_lock_irqsave(&sem->wait.lock, flags);
-                tsk->state = TASK_UNINTERRUPTIBLE;
-        }
-        remove_wait_queue_locked(&sem->wait, &wait);
-        wake_up_locked(&sem->wait);
-        spin_unlock_irqrestore(&sem->wait.lock, flags);
-        tsk->state = TASK_RUNNING;
-}
-
-int __sched __down_interruptible(struct semaphore *sem)
-{
-        int retval = 0;
-        struct task_struct *tsk = current;
-        DECLARE_WAITQUEUE(wait, tsk);
-        unsigned long flags;
-
-        tsk->state = TASK_INTERRUPTIBLE;
-        spin_lock_irqsave(&sem->wait.lock, flags);
-        add_wait_queue_exclusive_locked(&sem->wait, &wait);
-
-        sem->sleepers++;
-        for (;;) {
-                int sleepers = sem->sleepers;
-
-                /*
-                 * With signals pending, this turns into
-                 * the trylock failure case - we won't be
-                 * sleeping, and we* can't get the lock as
-                 * it has contention. Just correct the count
-                 * and exit.
-                 */
-                if (signal_pending(current)) {
-                        retval = -EINTR;
-                        sem->sleepers = 0;
-                        atomic_add(sleepers, &sem->count);
-                        break;
-                }
-
-                /*
-                 * Add "everybody else" into it. They aren't
-                 * playing, because we own the spinlock in
-                 * wait_queue_head. The "-1" is because we're
-                 * still hoping to get the semaphore.
-                 */
-                if (!atomic_add_negative(sleepers - 1, &sem->count)) {
-                        sem->sleepers = 0;
-                        break;
-                }
-                sem->sleepers = 1;      /* us - see -1 above */
-                spin_unlock_irqrestore(&sem->wait.lock, flags);
-
-                schedule();
-
-                spin_lock_irqsave(&sem->wait.lock, flags);
-                tsk->state = TASK_INTERRUPTIBLE;
-        }
-        remove_wait_queue_locked(&sem->wait, &wait);
-        wake_up_locked(&sem->wait);
-        spin_unlock_irqrestore(&sem->wait.lock, flags);
-
-        tsk->state = TASK_RUNNING;
-        return retval;
-}
-
-/*
- * Trylock failed - make sure we correct for
- * having decremented the count.
- *
- * We could have done the trylock with a
- * single "cmpxchg" without failure cases,
- * but then it wouldn't work on a 386.
- */
-int __down_trylock(struct semaphore *sem)
-{
-        int sleepers;
-        unsigned long flags;
-
-        spin_lock_irqsave(&sem->wait.lock, flags);
-        sleepers = sem->sleepers + 1;
-        sem->sleepers = 0;
-
-        /*
-         * Add "everybody else" and us into it. They aren't
-         * playing, because we own the spinlock in the
-         * wait_queue_head.
-         */
-        if (!atomic_add_negative(sleepers, &sem->count)) {
-                wake_up_locked(&sem->wait);
-        }
-
-        spin_unlock_irqrestore(&sem->wait.lock, flags);
-        return 1;
-}