Re: [PATCH v2] Makefile: Add option to disable gcc automatic inlining

[Ezequiel Garcia]

On Sun, Oct 7, 2012 at 7:21 PM, Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:
> Ezequiel Garcia <elezegarcia@xxxxxxxxx> writes:
>
>> The new option is CONFIG_CC_DISABLE_AUTO_INLINE and it's
>> located at:
>>   * Kernel hacking
>>     * Disable gcc automatic inlining
>
> You don't state anywhere why you want that?
>

This is important -if not necessary- to trace memory allocations with
ftrace kmem
events. Allocations are traced through _RET_IP_ macro, which in turn
only works accurately if gcc don't inline.

Without this patch you will trace callsites like kstrdup, instead of the real
caller.

Perhaps I should explain this better in the commit message?

Thanks for reviewing,

    Ezequiel
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