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Date: Thu, 6 Mar 2014 11:51:31 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Fernando Luis Vázquez Cao <fernando_b1@....ntt.co.jp> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, Ingo Molnar <mingo@...nel.org>, StevenRostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] sched/clock: prevent tracing recursion in sched_clock_cpu() On Thu, Mar 06, 2014 at 02:25:28PM +0900, Fernando Luis Vázquez Cao wrote: > From: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp> > > 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"). > > Cc: Linus Torvalds <torvalds@...ux-foundation.org> > Cc: Andrew Morton <akpm@...ux-foundation.org> > Cc: Ingo Molnar <mingo@...nel.org> > Cc: Steven Rostedt <rostedt@...dmis.org> > Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp> Thanks! -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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