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

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Date:	Thu, 28 Jan 2016 09:53:49 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Alexander Potapenko <glider@...gle.com>
Cc:	adech.fo@...il.com, cl@...ux.com, dvyukov@...gle.com,
	akpm@...ux-foundation.org, ryabinin.a.a@...il.com,
	kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v1 4/8] arch, ftrace: For KASAN put hard/soft IRQ
 entries into separate sections

On Wed, 27 Jan 2016 19:25:09 +0100
Alexander Potapenko <glider@...gle.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