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23 October 2021, 00:29:24 UTC
Revision 96b3d28bf4b00f62fc8386ff5d487d1830793a3d authored by Fernando Luis Vazquez Cao on 06 March 2014, 05:25:28 UTC, committed by Ingo Molnar on 11 March 2014, 10:33:48 UTC 
sched/clock: Prevent tracing recursion in sched_clock_cpu()
 
Prevent tracing of preempt_disable/enable() in sched_clock_cpu().
When CONFIG_DEBUG_PREEMPT is enabled, preempt_disable/enable() are
traced and this causes trace_clock() users (and probably others) to
go into an infinite recursion. Systems with a stable sched_clock()
are not affected.

This problem is similar to that fixed by upstream commit 95ef1e52922
("KVM guest: prevent tracing recursion with kvmclock").

Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1394083528.4524.3.camel@nexus
Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent 177c53d
History
Tip revision: 96b3d28bf4b00f62fc8386ff5d487d1830793a3d authored by Fernando Luis Vazquez Cao on 06 March 2014, 05:25:28 UTC
sched/clock: Prevent tracing recursion in sched_clock_cpu()
Tip revision: 96b3d28
File Mode Size
kvm
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