linux-kernel - Re: [PATCH 1/1] drivers/scsi/tmscsim.c: replace shift loop by ilog2

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Message-ID: <1400605602.26709.11.camel@joe-AO725>
Date:	Tue, 20 May 2014 10:06:42 -0700
From:	Joe Perches <joe@...ches.com>
To:	Fabian Frederick <fabf@...net.be>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Kurt Garloff <garloff@...e.de>,
	akpm <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/1] drivers/scsi/tmscsim.c: replace shift loop by ilog2

On Tue, 2014-05-20 at 18:48 +0200, Fabian Frederick wrote:
> Cc: Kurt Garloff <garloff@...e.de>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Fabian Frederick <fabf@...net.be>
> ---
>  drivers/scsi/tmscsim.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/tmscsim.c b/drivers/scsi/tmscsim.c
[]
> @@ -1611,7 +1611,7 @@ dc390_Reselect( struct dc390_acb* pACB )
>        printk (KERN_ERR "DC390: Reselection must select host adapter: %02x!\n", lun);
>      else
>        lun ^= 1 << pACB->pScsiHost->this_id; /* Mask AdapterID */
> -    id = 0; while (lun >>= 1) id++;
> +    id = ilog2(lun);
>      /* Get LUN */
>      lun = DC390_read8 (ScsiFifo);
>      if (!(lun & IDENTIFY_BASE)) printk (KERN_ERR "DC390: Resel: Expect identify message!\n");

Hey Fabian.

You've submitted several of these now.

Have you gone through all of these to make sure
that the ilog2(<foo>) uses are always using a
non-zero <foo>?

If so, that should be mentioned in the changelog.

These should probably add #include <linux/log2.h>

It would have been nicer to use a patch series
and a cover letter so I could make this reply to
to cover letter.

Please take the time to setup and use git send-email
instead of sylpheed.


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