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| author | Peter Zijlstra <peterz@infradead.org> | 2015-06-18 10:32:49 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-07-06 12:08:30 (GMT) |
| commit | 57ffc5ca679f499f4704fd9b6a372916f59930ee (patch) | |
| tree | d0cd5624c19e90d3bbbc9462b5ae6bbb1e6a9c81 /arch/x86/lib/usercopy.c | |
| parent | d2d61ed55f8375a10ff606e83e2196880a775fb4 (diff) | |
| download | linux-57ffc5ca679f499f4704fd9b6a372916f59930ee.tar.xz | |
perf: Fix AUX buffer refcounting
Its currently possible to drop the last refcount to the aux buffer
from NMI context, which results in the expected fireworks.
The refcounting needs a bigger overhaul, but to cure the immediate
problem, delay the freeing by using an irq_work.
Reviewed-and-tested-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20150618103249.GK19282@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/lib/usercopy.c')
0 files changed, 0 insertions, 0 deletions