linux-kernel - Re: can someone explain "inline" once and for all?

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Date:	Fri, 19 Jan 2007 15:01:44 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Robert P. J. Day" <rpjday@...dspring.com>
Cc:	"Linux kernel mailing list" <linux-kernel@...r.kernel.org>
Subject: Re: can someone explain "inline" once and for all?

On 1/19/07, Robert P. J. Day <rpjday@...dspring.com> wrote:
> is there a simple explanation for how to *properly* define inline
> routines in the kernel?  and maybe this can be added to the
> CodingStyle guide (he mused, wistfully).

AFAIK __always_inline is the only reliable way to force inlining where
it matters for correctness (for example, when playing tricks with
__builtin_return_address like we do in the slab).

Anything else is just a hint to the compiler that might be ignored if
the optimizer thinks it knows better.
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