linux-kernel - Re: [PATCH] ARM: tegra: add basic SecureOS support

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Message-ID: <20130610091012.GR18614@n2100.arm.linux.org.uk>
Date:	Mon, 10 Jun 2013 10:10:12 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Alexandre Courbot <gnurou@...il.com>
Cc:	Dave Martin <Dave.Martin@....com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Chris Johnson <CJohnson@...dia.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Karan Jhavar <kjhavar@...dia.com>,
	Matthew Longnecker <MLongnecker@...dia.com>,
	Alexandre Courbot <acourbot@...dia.com>,
	Joseph Lo <josephl@...dia.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: tegra: add basic SecureOS support

On Mon, Jun 10, 2013 at 04:47:22PM +0900, Alexandre Courbot wrote:
> One could remove the naked attribute and put there registers into the
> clobber list, but then the function will be inlined and we will have
> to ensure the parameters end up in the right register (and having a
> function that cannot be inlined is convenient in that respect). So as
> far as I can tell, having the function naked and saving the registers
> ourselves seems to be the most convenient way around this.

If you use such a large clobber list, you risk the compiler barfing on
you that it's run out of registers.
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