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author | Peter Zijlstra <peterz@infradead.org> | 2015-09-28 17:57:39 +0200 |
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committer | Ingo Molnar <mingo@kernel.org> | 2015-10-06 17:08:17 +0200 |
commit | 1dc0fffc48af94513e621f95dff730ed4f7317ec (patch) | |
tree | 602dbd67f0565830ea99196d71e7f47b17d849e3 /include/linux/preempt.h | |
parent | 3d8f74dd4ca1da8a1a464bbafcf679e40c2fc10f (diff) | |
download | linux-stable-1dc0fffc48af94513e621f95dff730ed4f7317ec.tar.gz linux-stable-1dc0fffc48af94513e621f95dff730ed4f7317ec.tar.bz2 linux-stable-1dc0fffc48af94513e621f95dff730ed4f7317ec.zip |
sched/core: Robustify preemption leak checks
When we warn about a preempt_count leak; reset the preempt_count to
the known good value such that the problem does not ripple forward.
This is most important on x86 which has a per cpu preempt_count that is
not saved/restored (after this series). So if you schedule with an
invalid (!2*PREEMPT_DISABLE_OFFSET) preempt_count the next task is
messed up too.
Enforcing this invariant limits the borkage to just the one task.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/preempt.h')
0 files changed, 0 insertions, 0 deletions