linux-kernel - Re: [PATCH 2.6.27-rc1] sparc64: FUTEX_OP

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Date:	Wed, 30 Jul 2008 15:40:17 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mikpe@...uu.se
Cc:	linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH 2.6.27-rc1] sparc64: FUTEX_OP_ANDN fix

From: Mikael Pettersson <mikpe@...uu.se>
Date: Thu, 31 Jul 2008 00:14:58 +0200 (MEST)

> Correct sparc64's implementation of FUTEX_OP_ANDN to do a
> bitwise negate of the oparg parameter before applying the
> AND operation. All other archs that support FUTEX_OP_ANDN
> either negate oparg explicitly (frv, ia64, mips, sh, x86),
> or do so indirectly by using an and-not instruction (powerpc).
> Since sparc64 has and-not, I chose to use that solution.
> 
> I've not found any use of FUTEX_OP_ANDN in glibc so the
> impact of this bug is probably minor. But other user-space
> components may try to use it so it should still get fixed.
> 
> Signed-off-by: Mikael Pettersson <mikpe@...uu.se>

Thanks a lot for this fix, I'll apply it!
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