From: "David S. Miller" <davem@redhat.com>
To: Paul Mackerras <paulus@samba.org>
Cc: akpm@osdl.org, olof@austin.ibm.com, anton@samba.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] PPC64 Better little-endian bitops
Date: Fri, 20 Aug 2004 09:58:39 -0700 [thread overview]
Message-ID: <20040820095839.4dc12d67.davem@redhat.com> (raw)
In-Reply-To: <16677.41654.992265.563552@cargo.ozlabs.ibm.com>
On Fri, 20 Aug 2004 17:05:26 +1000
Paul Mackerras <paulus@samba.org> wrote:
> Below patch reuses the big-endian bitops for the little endian ones, and
> moves the ext2_{set,clear}_bit_atomic functions to be truly atomic
> instead of lock based.
>
> This requires that the bitmaps passed to the ext2_* bitop functions
> are 8-byte aligned. I have been assured that they will be 512-byte or
> 1024-byte aligned, and sparc and ppc32 also impose an alignment
> requirement on the bitmap.
Nice. I noticed this trick before in the s390 headers.
I'll do this on sparc64 too...
prev parent reply other threads:[~2004-08-20 17:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-20 7:05 Paul Mackerras
2004-08-20 16:58 ` David S. Miller [this message]
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