linux-kernel - Re: [PATCH v2] sparc64: do not clobber personality flags in sys_sparc64

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Message-Id: <20120802.002759.225229908260811459.davem@davemloft.net>
Date:	Thu, 02 Aug 2012 00:27:59 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jkosina@...e.cz
Cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sparc64: do not clobber personality flags in
 sys_sparc64_personality()

From: Jiri Kosina <jkosina@...e.cz>
Date: Thu, 2 Aug 2012 09:12:46 +0200 (CEST)

> From 4f000eda5917ceecb03767962026cc6a390b8216 Mon Sep 17 00:00:00 2001
> From: Jiri Kosina <jkosina@...e.cz>
> Date: Wed, 1 Aug 2012 21:10:51 +0200
> Subject: [PATCH 4/4] sparc64: do not clobber personality flags in sys_sparc64_personality()
> 
> There are multiple errors in how sys_sparc64_personality() handles
> personality flags stored in top three bytes.
> 
> - directly comparing current->personality against PER_LINUX32 doesn't work
>   in cases when any of the personality flags stored in the top three bytes
>   are used.
> - directly forcefully setting personality to PER_LINUX32 or PER_LINUX
>   discards any flags stored in the top three bytes
> 
> Fix the first one by properly using personality() macro to compare only
> PER_MASK bytes.
> Fix the second one by setting only the bits that should be set, instead of
> overwriting the whole value.
> 
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>

Applied, thanks a lot Jiri.
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