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| author |   Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-06-03 11:21:20 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2010-06-03 17:03:08 +0200 |
| commit | c6df8d5ab87a246942d138321e1721edbb69f6e1 (patch) | |
| tree | 4fa2965d148c3e7ea456ab889d278d5c16d25d17 /fs/jbd/commit.c | |
| parent | Merge branch 'perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux-2.6 into perf/urgent (diff) | |
| download | linux-dev-c6df8d5ab87a246942d138321e1721edbb69f6e1.tar.xz linux-dev-c6df8d5ab87a246942d138321e1721edbb69f6e1.zip | |
perf: Fix crash in swevents
Frederic reported that because swevents handling doesn't disable IRQs
anymore, we can get a recursion of perf_adjust_period(), once from
overflow handling and once from the tick.
If both call ->disable, we get a double hlist_del_rcu() and trigger
a LIST_POISON2 dereference.
Since we don't actually need to stop/start a swevent to re-programm
the hardware (lack of hardware to program), simply nop out these
callbacks for the swevent pmu.
Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1275557609.27810.35218.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'fs/jbd/commit.c')
0 files changed, 0 insertions, 0 deletions