From: Tejun Heo <htejun@gmail.com>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: Carlos.Pardo@siliconimage.com, linux-ide@vger.kernel.org
Subject: Re: [PATCH 5/6] sata_sil: convert sil_port[] to u16 from unsigned long
Date: Sun, 05 Mar 2006 16:48:29 +0900 [thread overview]
Message-ID: <440A97CD.30404@gmail.com> (raw)
In-Reply-To: <440A969A.5090503@pobox.com>
Jeff Garzik wrote:
> Tejun Heo wrote:
>
>> unsigned long is way too big for sil_port[] offsets (currently the
>> table is 256 bytes on 64bit machines). Convert sil_port[] to u16.
>>
>> Signed-off-by: Tejun Heo <htejun@gmail.com>
>
>
> NAK. This just forces the compiler to promote these from u16 to machine
> int (i.e. unsigned long) at addition time. Table size is a very trivial
> matter.
>
Wouldn't that be cheaper than extra cache lines? I'm pretty sure it
would be on x86/64.
--
tejun
next prev parent reply other threads:[~2006-03-05 7:48 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-05 7:03 [PATCHSET] sata_sil misc updates Tejun Heo
2006-03-05 7:03 ` [PATCH 5/6] sata_sil: convert sil_port[] to u16 from unsigned long Tejun Heo
2006-03-05 7:43 ` Jeff Garzik
2006-03-05 7:48 ` Tejun Heo [this message]
2006-03-05 15:50 ` Jeff Garzik
2006-03-05 7:03 ` [PATCH 3/6] sata_sil: use kzalloc Tejun Heo
2006-03-05 7:03 ` [PATCH 4/6] sata_sil: replace register address constants with sil_port[] entry Tejun Heo
2006-03-05 7:03 ` [PATCH 6/6] sata_sil: cosmetic flag/constant changes Tejun Heo
2006-03-05 7:03 ` [PATCH 2/6] sata_sil: kill bogus PCI ID 0x1095/0x0240 Tejun Heo
2006-03-05 7:41 ` Jeff Garzik
2006-03-05 7:51 ` Tejun Heo
2006-03-05 7:03 ` [PATCH 1/6] sata_sil: replace sil_3112_m15w board id with sil_3112 Tejun Heo
2006-03-05 7:40 ` Jeff Garzik
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