linux-kernel - Re: [PATCH v3] bitops: Fix shift overflow in GENMASK macros

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Message-ID: <20141104132731.GO3337@twins.programming.kicks-ass.net>
Date:	Tue, 4 Nov 2014 14:27:31 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Maxime COQUELIN <maxime.coquelin@...com>
Cc:	gong.chen@...ux.intel.com, Ingo Molnar <mingo@...nel.org>,
	" Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, tytso@....edu,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel@...inux.com, eric.paire@...com
Subject: Re: [PATCH v3] bitops: Fix shift overflow in GENMASK macros

On Tue, Nov 04, 2014 at 11:58:17AM +0100, Maxime COQUELIN wrote:
> On some 32 bits architectures, including x86, GENMASK(31, 0) returns 0
> instead of the expected ~0UL.
> 
> This is the same on some 64 bits architectures with GENMASK_ULL(63, 0).
> 
> This is due to an overflow in the shift operand, 1 << 32 for GENMASK,
> 1 << 64 for GENMASK_ULL.
> 
> Fixes: 10ef6b0dffe404bcc54e94cb2ca1a5b18445a66b
> Cc: <stable@...r.kernel.org> #v3.13+
> Reported-by: Eric Paire <eric.paire@...com>
> Suggested-by: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Maxime Coquelin <maxime.coquelin@...com>


There doesn't appear to be a clear maintainer for this file, so I'll try
and stick in in tip.

Thanks!

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