From: "David S. Miller" <davem@redhat.com>
To: Andrew Morton <akpm@osdl.org>
Cc: paulus@samba.org, viro@parcelfarce.linux.theplanet.co.uk,
olof@austin.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: Alignment of bitmaps for ext2_set_bit et al.
Date: Thu, 19 Aug 2004 07:42:55 -0700 [thread overview]
Message-ID: <20040819074255.00e27060.davem@redhat.com> (raw)
In-Reply-To: <20040819042234.75020cbc.akpm@osdl.org>
On Thu, 19 Aug 2004 04:22:34 -0700
Andrew Morton <akpm@osdl.org> wrote:
> Paul Mackerras <paulus@samba.org> wrote:
> >
> > What can we assume about the alignment of the bitmap pointer passed to
> > the ext2_{set,clear}_bit_atomic functions? Can we assume that they
> > will be aligned to an long boundary (8 bytes on 64-bit)?
>
> For ext2 and ext3 it's safe to assume that they are 1024-byte aligned.
>
> But it's possible that other filesystems are using these (awfully named)
> functions.
FWIW, I've been using 4-byte word atomics for those routines
on sparc64 and have never gotten an unaligned trap for it yet.
next prev parent reply other threads:[~2004-08-19 14:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-19 11:16 Alignment of bitmaps for ext2_set_bit et al Paul Mackerras
2004-08-19 11:22 ` Andrew Morton
2004-08-19 14:42 ` David S. Miller [this message]
2004-08-19 20:39 ` Olof Johansson
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