linux-kernel - Re: [PATCH v6 1/2] arm64: adjust el0_sync so that a function can be called

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Message-ID: <20140530182037.GH22895@arm.com>
Date:	Fri, 30 May 2014 19:20:37 +0100
From:	Will Deacon <will.deacon@....com>
To:	Larry Bassel <larry.bassel@...aro.org>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"khilman@...aro.org" <khilman@...aro.org>
Subject: Re: [PATCH v6 1/2] arm64: adjust el0_sync so that a function can be
 called

On Thu, May 29, 2014 at 10:45:03PM +0100, Larry Bassel wrote:
> To implement the context tracker properly on arm64,
> a function call needs to be made after debugging and
> interrupts are turned on, but before the lr is changed
> to point to ret_to_user(). If the function call
> is made after the lr is changed the function will not
> return to the correct place.
> 
> For similar reasons, defer the setting of x0 so that
> it doesn't need to be saved around the function call
> (save far_el1 in x26 temporarily instead).

  Acked-by: Will Deacon <will.deacon@....com>

Thanks guys!

Will
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