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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-06-03 05:21:20 -0400
committerIngo Molnar <mingo@elte.hu>2010-06-03 11:03:08 -0400
commitc6df8d5ab87a246942d138321e1721edbb69f6e1 (patch)
tree4fa2965d148c3e7ea456ab889d278d5c16d25d17 /kernel/res_counter.c
parentda3fd1a0010ccc9fe6fd5ae2b9e85e1aacc03e4d (diff)
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 'kernel/res_counter.c')
0 files changed, 0 insertions, 0 deletions