linux-kernel - Re: [PATCH 1/2] WorkStruct: Add assign_bits() to give an atomic-bitops safe assignment

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Date:	Wed, 13 Dec 2006 10:03:43 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Russell King <rmk+lkml@....linux.org.uk>
Cc:	David Howells <dhowells@...hat.com>, torvalds@...l.org,
	akpm@...l.org, davem@...emloft.com, matthew@....cx,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 1/2] WorkStruct: Add assign_bits() to give an atomic-bitops safe assignment

Russell King writes:

> Why can't we just use atomic_t for this?

On 64-bit platforms, atomic_t tends to be 4 bytes, whereas bitops work
on arrays of unsigned long, i.e. multiples of 8 bytes.  We could
use atomic_long_t for this, however.

Paul.
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