linux-kernel - Re: Crash when memset of shared mapped memory in ARM

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Message-ID: <20111116115435.GI4942@mudshark.cambridge.arm.com>
Date:	Wed, 16 Nov 2011 11:54:35 +0000
From:	Will Deacon <will.deacon@....com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	naveen yadav <yad.naveen@...il.com>, linux-mm <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: Crash when memset of shared mapped memory in ARM

(Replying to Russell so as to lose the -request addresses)

On Wed, Nov 16, 2011 at 08:45:47AM +0000, Russell King - ARM Linux wrote:
> Please do not spam mailing lists -request addresses when you post.  The
> -request addresses are there for you to give the mailing list software
> _instructions_ on what to do with your subscription.  It is not for
> posts to the mailing list.

For what it's worth, I was brave/daft enough to compile and run the testcase
with an -rc1 kernel and Linaro 11.09 filesystem on the quad A9 Versatile
Express:

root@...cing-fool:~# ./yad
mmap: addr 0x20000000
root@...cing-fool:~# ./yad
shm_open: File exists
mmap: addr 0x20000000

Looks like I'm missing the fireworks, despite the weirdy MAP_SHARED |
MAP_FIXED mmap flags.

Will
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