The patch titled
detect atomic counter underflows
has been removed from the -mm tree. Its filename was
detect-atomic-counter-underflows.patch
This patch was dropped because I got tired of chasing files all around the tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: detect atomic counter underflows
From: Ingo Molnar <mingo@xxxxxxx>
The patch below will detect atomic counter underflows. This has been
test-driven in the -RT patchset for some time. qdisc_destroy() triggered
it sometimes (in a seemingly nonfatal way, during device shutdown) - with
DaveM suggesting that it is most likely a bug in the networking code. So
it would be nice to have this in -mm for some time to validate all atomic
counters on a broader base.
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-x86/atomic_32.h | 5 +++++
1 file changed, 5 insertions(+)
diff -puN include/asm-x86/atomic_32.h~detect-atomic-counter-underflows include/asm-x86/atomic_32.h
--- a/include/asm-x86/atomic_32.h~detect-atomic-counter-underflows
+++ a/include/asm-x86/atomic_32.h
@@ -113,6 +113,11 @@ static inline int atomic_dec_and_test(at
{
unsigned char c;
+ if (!atomic_read(v)) {
+ printk("BUG: atomic counter underflow at:\n");
+ dump_stack();
+ }
+
asm volatile(LOCK_PREFIX "decl %0; sete %1"
: "+m" (v->counter), "=qm" (c)
: : "memory");
_
Patches currently in -mm which might be from mingo@xxxxxxx are
linux-next.patch
x86-remove-init_mm-export-as-planned-for-2626.patch
arch-x86-kernel-setupc-omit-dmi_low_memory_corruption-when-it-is-unneeded.patch
kvmclockc-fix-section-mismatch-warning.patch
mutex-improve-header-comment-to-be-actually-informative-about-the-api.patch
mm-cleanup-to-make-remove_memory-arch-neutral-fix-fix.patch
mm-invoke-oom-killer-from-page-fault.patch
mm-invoke-oom-killer-from-page-fault-fix.patch
detect-atomic-counter-underflows.patch
make-frame_pointer-default=y.patch
mutex-subsystem-synchro-test-module.patch
likely-profiling-disable-ftrace.patch
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