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Re: [PATCH v1 4/8] arch, ftrace: For KASAN put hard/soft IRQ entries into separate sections

From	Steven Rostedt <rostedt@goodmis.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH v1 4/8] arch, ftrace: For KASAN put hard/soft IRQ entries into separate sections
Date	2016-01-28 16:00 +0100
Message-ID	<qVWdd-4Sp-51@gated-at.bofh.it> (permalink)
References	<qVD0R-7IE-5@gated-at.bofh.it> <qVD0R-7IE-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, 27 Jan 2016 19:25:09 +0100
Alexander Potapenko <glider@google.com> wrote:

> --- a/include/linux/ftrace.h
> +++ b/include/linux/ftrace.h
> @@ -762,6 +762,26 @@ struct ftrace_graph_ret {
>  typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
>  typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
>  
> +#if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
> +/*
> + * We want to know which function is an entrypoint of a hardirq.
> + */
> +#define __irq_entry		 __attribute__((__section__(".irqentry.text")))
> +#define __softirq_entry  \
> +	__attribute__((__section__(".softirqentry.text")))
> +
> +/* Limits of hardirq entrypoints */
> +extern char __irqentry_text_start[];
> +extern char __irqentry_text_end[];
> +/* Limits of softirq entrypoints */
> +extern char __softirqentry_text_start[];
> +extern char __softirqentry_text_end[];
> +
> +#else
> +#define __irq_entry
> +#define __softirq_entry
> +#endif
> +
>  #ifdef CONFIG_FUNCTION_GRAPH_TRACER
>  
>  /* for init task */

Since this is no longer just used for function tracing, perhaps the
code should be moved to include/linux/irq.h or something.

-- Steve

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Re: [PATCH v1 4/8] arch, ftrace: For KASAN put hard/soft IRQ  entries into separate sections Steven Rostedt <rostedt@goodmis.org> - 2016-01-28 16:00 +0100
  Re: [PATCH v1 4/8] arch, ftrace: For KASAN put hard/soft IRQ entries  into separate sections Alexander Potapenko <glider@google.com> - 2016-01-29 12:40 +0100
    Re: [PATCH v1 4/8] arch, ftrace: For KASAN put hard/soft IRQ entries  into separate sections Alexander Potapenko <glider@google.com> - 2016-01-29 13:00 +0100
      Re: [PATCH v1 4/8] arch, ftrace: For KASAN put hard/soft IRQ  entries into separate sections Steven Rostedt <rostedt@goodmis.org> - 2016-01-29 15:50 +0100

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