linux-kernel - Re: [RFC PATCH 3/5] asm-generic/bitops/atomic.h: Rewrite using atomic_fetch

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Message-ID: <20180216141829.GK25235@hirez.programming.kicks-ass.net>
Date:   Fri, 16 Feb 2018 15:18:29 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Will Deacon <will.deacon@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        mingo@...nel.org
Subject: Re: [RFC PATCH 3/5] asm-generic/bitops/atomic.h: Rewrite using
 atomic_fetch_*

On Fri, Feb 16, 2018 at 11:35:20AM +0100, Peter Zijlstra wrote:

> #define BIT_U32_MASK(nr)	(1UL << ((nr) % 32))
> #define BIT_U32_WORD(nr)	(((nr) / 32) ^ (4 * __BIG_ENDIAN__))

s/4 *//

it's already a 4 byte offset.