linux-kernel - Re: [PATCH 2/4] msm: scm: Fix improper register assignment

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Date:	Tue, 01 Mar 2011 19:02:27 -0500 (EST)
From:	Nicolas Pitre <nico@...xnic.net>
To:	Saravana Kannan <skannan@...eaurora.org>
Cc:	Will Deacon <will.deacon@....com>,
	David Brown <davidb@...eaurora.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-arm-msm@...r.kernel.org, Stephen Boyd <sboyd@...eaurora.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/4] msm: scm: Fix improper register assignment

On Tue, 1 Mar 2011, Saravana Kannan wrote:

> On 03/01/2011 02:37 AM, Will Deacon wrote:
> > Perhaps a more robust fix would be to remove the register int
> > declarations and handle the parameter marshalling in the same asm block
> > that contains the smc?
> 
> I was thinking the same, but the opposing idea I heard was that not doing it
> inside the asm block would allow GCC to be make better use of the registers.

Indeed.  And a significant body of code out there does rely on this gcc 
feature, so it has to minimally work.

> Didn't have a strong opinion either way, so we went with the implementation
> that was sent out.

ACK.


Nicolas
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