The patch titled
Conditionally check expected_preempt_count in __resched_legal()
has been removed from the -mm tree. Its filename was
conditionally-check-expected_preempt_count-in-__resched_legal.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: Conditionally check expected_preempt_count in __resched_legal()
From: Mark Fasheh <[EMAIL PROTECTED]>
Commit 2d7d253548cffdce80f4e03664686e9ccb1b0ed7 ("fix cond_resched() fix")
introduced an 'expected_preempt_count' parameter to __resched_legal() to
fix a bug where it was returning a false negative when called from
cond_resched_lock() and preemption was enabled.
Unfortunately this broke things for when preemption is disabled.
preempt_count() will always return zero, thus failing the check against any
value of expected_preempt_count not equal to zero. cond_resched_lock() for
example, passes an expected_preempt_count value of 1.
So fix the fix for the cond_resched() fix by skipping the check of
preempt_count() against expected_preempt_count when preemption is disabled.
Credit should go to Sunil Mushran for spotting the bug during testing.
Signed-off-by: Mark Fasheh <[EMAIL PROTECTED]>
Acked-by: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
kernel/sched.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN
kernel/sched.c~conditionally-check-expected_preempt_count-in-__resched_legal
kernel/sched.c
---
a/kernel/sched.c~conditionally-check-expected_preempt_count-in-__resched_legal
+++ a/kernel/sched.c
@@ -4619,8 +4619,10 @@ asmlinkage long sys_sched_yield(void)
static inline int __resched_legal(int expected_preempt_count)
{
+#ifdef CONFIG_PREEMPT
if (unlikely(preempt_count() != expected_preempt_count))
return 0;
+#endif
if (unlikely(system_state != SYSTEM_RUNNING))
return 0;
return 1;
_
Patches currently in -mm which might be from [EMAIL PROTECTED] are
origin.patch
git-ocfs2.patch
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