linux-kernel - Re: [PATCH v2] powerpc: fix personality handling in ppc64

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Message-ID: <alpine.LNX.2.00.1209061039180.23459@pobox.suse.cz>
Date:	Thu, 6 Sep 2012 10:46:19 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Andreas Schwab <schwab@...ux-m68k.org>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] powerpc: fix personality handling in
 ppc64_personality()

On Thu, 6 Sep 2012, Benjamin Herrenschmidt wrote:

> > actually commit 7256a5d2da56 seems to contain the correct PER_LINUX 
> > handling, so seems like you picked the right one :)
> > 
> 
> Odd, they looked different around the use of PER_MASK when I looked but

The original patch had

	personality &= ~PER_LINUX | PER_LINUX32;

Which is bogus, exactly because ~PER_LINUX is -1.

I then used

	personality = (personality & ~PER_MASK) | PER_LINUX32;

which is correct and perhaps a little bit more descriptive, and that is 
what you have merged, so all is fine.

> I was tired & jet lagged, so I might have just had a brain fail...

Probably just missed that the first patch used PER_LINUX and the second 
one PER_MASK, or whatever.

Anyway, thanks.

-- 
Jiri Kosina
SUSE Labs
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