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

[Alexander Potapenko]

Agreed. Once I receive more comments I will make a new patch set and
include this change as well.

On Thu, Jan 28, 2016 at 3:53 PM, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> On Wed, 27 Jan 2016 19:25:09 +0100
> Alexander Potapenko <glider@xxxxxxxxxx> 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
>



-- 
Alexander Potapenko
Software Engineer

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