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Message-ID: <alpine.LFD.2.11.1407181652080.3647@knanqh.ubzr> Date: Fri, 18 Jul 2014 16:55:42 -0400 (EDT) From: Nicolas Pitre <nicolas.pitre@...aro.org> To: Steven Rostedt <rostedt@...dmis.org> cc: Ingo Molnar <mingo@...hat.com>, Daniel Lezcano <daniel.lezcano@...aro.org>, Russell King - ARM Linux <linux@....linux.org.uk>, Catalin Marinas <catalin.marinas@....com>, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linaro-kernel@...ts.linaro.org Subject: Re: [PATCH 2/4] ARM: add IPI tracepoints On Fri, 18 Jul 2014, Steven Rostedt wrote: > On Fri, 18 Jul 2014 01:18:53 -0400 > Nicolas Pitre <nicolas.pitre@...aro.org> wrote: > > > > -#ifdef CONFIG_IRQ_WORK > > -void arch_irq_work_raise(void) > > -{ > > - if (is_smp()) > > - smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK); > > -} > > +static const char *ipi_types[NR_IPI] > > +#ifdef CONFIG_TRACING > > +__tracepoint_string > > #endif > > Oh, this is ugly. I should probably add a define when !CONFIG_TRACING > is set. Something like: > > #ifdef CONFIG_TRACING > ... > #else > # define __tracepoint_string > #endif > > Such that users of __tracepoint_string don't need to add ugly ifdefs in > the code. > > If you want to add that to ftrace_event.h to this series, I'll ack it. Here's the patch I have at the head of the series now, with the above ugliness changed to an unconditional __tracepoint_string attribute. From: Nicolas Pitre <nicolas.pitre@...aro.org> Date: Fri, 18 Jul 2014 16:34:39 -0400 Subject: [PATCH] trace: don't refer __tracepoint_string to an undefined linker section When CONFIG_TRACING is not set, the linker script doesn't specify any __tracepoint_str section. Let those __tracepoint_string marked strings live in the default rodata section in that case. Signed-off-by: Nicolas Pitre <nico@...aro.org> diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h index cff3106ffe..d6346607e4 100644 --- a/include/linux/ftrace_event.h +++ b/include/linux/ftrace_event.h @@ -606,7 +606,11 @@ do { \ static const char *___tp_str __tracepoint_string = str; \ ___tp_str; \ }) +#ifdef CONFIG_TRACING #define __tracepoint_string __attribute__((section("__tracepoint_str"))) +#else +#define __tracepoint_string +#endif #ifdef CONFIG_PERF_EVENTS struct perf_event; -- 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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