From: Andi Kleen <ak@muc.de>
To: "David S. Miller" <davem@redhat.com>
Cc: ak@muc.de, akpm@digeo.com, linux-kernel@vger.kernel.org,
anton@samba.org, schwidefsky@de.ibm.com, davidm@hpl.hp.com,
matthew@wil.cx, ralf@linux-mips.org, rth@redhat.com
Subject: Re: Reduce struct page by 8 bytes on 64bit
Date: Wed, 16 Apr 2003 16:43:12 +0200 [thread overview]
Message-ID: <20030416144312.GA2327@averell> (raw)
In-Reply-To: <20030416.072638.65480350.davem@redhat.com>
On Wed, Apr 16, 2003 at 04:26:38PM +0200, David S. Miller wrote:
> From: Andi Kleen <ak@muc.de>
> Date: Wed, 16 Apr 2003 16:07:15 +0200
>
> How so? Of course I could write an generic set_bit32, but the question
> is if these bit operations would be still atomic on SMP and not conflict with
> fields occuping the same 8 byte slot. I remember you flaming someone
> some time ago because he used set_bit in an atomic fashion on a type smaller
> than unsigned long for example.
>
> It's OK if you align the pointer to 8 bytes, and subsequently the bit
> offset as appropriate. :-)
On sparc64. But is that true too for all other 64bit architectures supported?
e.g. How about PA-RISC? (always seems to do things differently)
-Andi
next prev parent reply other threads:[~2003-04-16 14:31 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-15 11:24 Reduce struct page by 8 bytes on 64bit Andi Kleen
2003-04-16 12:45 ` David S. Miller
2003-04-16 13:22 ` Jakub Jelinek
2003-04-16 14:07 ` Andi Kleen
2003-04-16 14:26 ` David S. Miller
2003-04-16 14:43 ` Andi Kleen [this message]
2003-04-16 14:38 ` David S. Miller
2003-04-16 14:58 ` Andi Kleen
2003-04-16 14:58 ` David S. Miller
2003-04-16 14:55 ` Matthew Wilcox
2003-04-16 15:04 ` Andi Kleen
2003-04-16 15:00 ` David S. Miller
2003-04-16 15:11 ` Matthew Wilcox
2003-04-16 20:35 ` Andrew Morton
2003-04-16 21:26 ` Matthew Wilcox
2003-04-16 21:43 ` Andrew Morton
2003-04-16 21:40 ` David S. Miller
2003-04-17 15:20 ` Andi Kleen
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