linux-kernel - Re: [PATCH] arm: Blacklist gcc 4.8.[012] and 4.9.0 with CONFIG_FRAME

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Date:	Fri, 10 Oct 2014 12:55:34 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Aaro Koskinen <aaro.koskinen@....fi>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, Felipe Balbi <balbi@...com>,
	Rabin Vincent <rabin@....in>
Subject: Re: [PATCH] arm: Blacklist gcc 4.8.[012] and 4.9.0 with CONFIG_FRAME_POINTER

On 10/10/2014 12:36 PM, Russell King - ARM Linux wrote:
> On Fri, Oct 10, 2014 at 12:26:14PM -0400, Peter Hurley wrote:
>> gcc versions 4.8.[012] and 4.9.0 generates code that prematurely
>> adjusts the stack pointer such that still-to-be-referenced locals
>> are below the stack pointer, which allows them to be overwritten
>> by interrupts.
> 
> I would much rather do this in asm-offsets.c, along side the other ARM
> specific buggy compiler test(s).  I'm presently putting together such
> a patch.
> 
> The information in the thread on linux-omap says only GCC 4.8.1 and
> GCC 4.8.2.  Where do you get the other versions from?

The gcc PR linked in the commit message; see the "Known to fail" field.

Regards,
Peter Hurley
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