Message-ID: <54380F86.10005@hurleysoftware.com>
Date: Fri, 10 Oct 2014 12:55:34 -0400
From: Peter Hurley <peter@hurleysoftware.com>
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To: Russell King - ARM Linux <linux@arm.linux.org.uk>
CC: Aaro Koskinen <aaro.koskinen@iki.fi>, Johannes Weiner <hannes@cmpxchg.org>,
        linux-kernel@vger.kernel.org, Felipe Balbi <balbi@ti.com>,
        Rabin Vincent <rabin@rab.in>
Subject: Re: [PATCH] arm: Blacklist gcc 4.8.[012] and 4.9.0 with CONFIG_FRAME_POINTER
References: <1412958374-16090-1-git-send-email-peter@hurleysoftware.com> <20141010163613.GO5182@n2100.arm.linux.org.uk>
In-Reply-To: <20141010163613.GO5182@n2100.arm.linux.org.uk>
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Sender: linux-kernel-owner@vger.kernel.org

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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