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Message-Id: <20100727161819.cf6feab1.akpm@linux-foundation.org> Date: Tue, 27 Jul 2010 16:18:19 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: monstr@...str.eu Cc: rostedt@...dmis.org, linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...e.hu, linux-arch@...r.kernel.org Subject: Re: [PATCH] asm-generic: Use raw_local_irq_save/restore instead local_irq_save/restore On Mon, 26 Jul 2010 10:49:50 +0200 Michal Simek <monstr@...str.eu> wrote: > start/stop_critical_timing function for preemptirqsoff, preemptoff > and irqsoff tracers contains atomic_inc and atomic_dec operations. > > Atomic operations used local_irq_save/restore macros to ensure > atomic access but they are traced by the same function which is causing > recursion problem. > > The reason is when these tracers are turn ON then local_irq_save/restore > macros are changed in include/linux/irqflags.h to call trace_hardirqs_on/off > which call start/stop_critical_timing. > > Microblaze was affected because use generic atomic implementation. Seems that this will also affect blackfin, mn10300 and score. I guess they aren't supporting tracing yet? > Signed-off-by: Michal Simek <monstr@...str.eu> > Acked-by: Steven Rostedt <rostedt@...dmis.org> > Signed-off-by: Andrew Morton <akpm@...ux-foundation.org> hm, I wonder how my signoff got there. Doesn't matter. -- 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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