Messages in this thread | | | Subject | Re: [PATCH 1/1] drivers/scsi/tmscsim.c: replace shift loop by ilog2 | From | Joe Perches <> | Date | Wed, 21 May 2014 18:03:52 -0700 |
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On Wed, 2014-05-21 at 17:28 -0700, Guenter Roeck wrote: > On Tue, May 20, 2014 at 10:06:42AM -0700, Joe Perches wrote: > > On Tue, 2014-05-20 at 18:48 +0200, Fabian Frederick wrote: > > > Cc: Kurt Garloff <garloff@suse.de> > > > Cc: Andrew Morton <akpm@linux-foundation.org> > > > Signed-off-by: Fabian Frederick <fabf@skynet.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>? > > > Maybe I am missing something. Why not just use fls() ?
fls strains Andrew Morton's brain.
https://lkml.org/lkml/2014/5/19/771
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