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

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Message-ID: <CALF0-+Wwf3gOWtZFrEwkQ4HUEZ-zagVSSN3QbZEYT4RhCGYoaA@mail.gmail.com>
Date:	Sun, 7 Oct 2012 19:34:02 -0300
From:	Ezequiel Garcia <elezegarcia@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, Tim Bird <tim.bird@...sony.com>,
	mmarek@...e.cz, sam@...nborg.org, rientjes@...gle.com
Subject: Re: [PATCH v2] Makefile: Add option to disable gcc automatic inlining

On Sun, Oct 7, 2012 at 7:21 PM, Andi Kleen <andi@...stfloor.org> wrote:
> Ezequiel Garcia <elezegarcia@...il.com> 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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