linux-kernel - Re: [PATCH] powerpc: inline current_stack

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Message-ID: <20160531200519.25fdf12c@kryten>
Date:	Tue, 31 May 2016 20:05:19 +1000
From:	Anton Blanchard <anton@...ba.org>
To:	Christophe Leroy <christophe.leroy@....fr>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Scott Wood <oss@...error.net>, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: inline current_stack_pointer()

Hi,

> current_stack_pointeur() is a single instruction function. it
> It is not worth breaking the execution flow with a bl/blr for a
> single instruction

Check out bfe9a2cfe91a ("powerpc: Reimplement __get_SP() as a function
not a define") to see why we made it a function.

Anton