Messages in this thread Patch in this message | | | Date | Wed, 23 Mar 2016 18:50:21 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 2/5] perf core: Set event's default overflow_handler |
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On Mon, Mar 14, 2016 at 09:59:42AM +0000, Wang Nan wrote: > +++ b/arch/arm/kernel/hw_breakpoint.c > @@ -631,7 +631,7 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp) > info->address &= ~alignment_mask; > info->ctrl.len <<= offset; > > - if (!bp->overflow_handler) { > + if (is_default_overflow_handler(bp)) { > /* > * Mismatch breakpoints are required for single-stepping > * breakpoints. > @@ -754,7 +754,7 @@ static void watchpoint_handler(unsigned long addr, unsigned int fsr, > * mismatch breakpoint so we can single-step over the > * watchpoint trigger. > */ > - if (!wp->overflow_handler) > + if (is_default_overflow_handler(wp)) > enable_single_step(wp, instruction_pointer(regs)); > > unlock: > diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c > index b45c95d..4ef5373 100644 > --- a/arch/arm64/kernel/hw_breakpoint.c > +++ b/arch/arm64/kernel/hw_breakpoint.c > @@ -616,7 +616,7 @@ static int breakpoint_handler(unsigned long unused, unsigned int esr, > perf_bp_event(bp, regs); > > /* Do we need to handle the stepping? */ > - if (!bp->overflow_handler) > + if (is_default_overflow_handler(bp)) > step = 1; > unlock: > rcu_read_unlock(); > @@ -712,7 +712,7 @@ static int watchpoint_handler(unsigned long addr, unsigned int esr, > perf_bp_event(wp, regs); > > /* Do we need to handle the stepping? */ > - if (!wp->overflow_handler) > + if (is_default_overflow_handler(wp)) > step = 1; > > unlock:
Will, why does it matter what the overflow handler is for this stuff?
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