Re: [PATCH] Re: cciss: warning: right shift count >= width of type

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Sun, 2007-08-12 at 07:58 +0100, Al Viro wrote:
> On Sun, Aug 12, 2007 at 03:21:57AM +0200, Rene Herman wrote:
> > @@ -2609,13 +2609,13 @@ static void do_cciss_request(request_queue_t *q)
> >  		} else {
> >  			c->Request.CDBLen = 16;
> >  			c->Request.CDB[1]= 0;
> > -			c->Request.CDB[2]= (start_blk >> 56) & 0xff;	//MSB
> > -			c->Request.CDB[3]= (start_blk >> 48) & 0xff;
> > -			c->Request.CDB[4]= (start_blk >> 40) & 0xff;
> > -			c->Request.CDB[5]= (start_blk >> 32) & 0xff;
> > -			c->Request.CDB[6]= (start_blk >> 24) & 0xff;
> > -			c->Request.CDB[7]= (start_blk >> 16) & 0xff;
> > -			c->Request.CDB[8]= (start_blk >>  8) & 0xff;
> > +			c->Request.CDB[2]= ((u64)start_blk >> 56) & 0xff;	//MSB
> > +			c->Request.CDB[3]= ((u64)start_blk >> 48) & 0xff;
> > +			c->Request.CDB[4]= ((u64)start_blk >> 40) & 0xff;
> > +			c->Request.CDB[5]= ((u64)start_blk >> 32) & 0xff;
> > +			c->Request.CDB[6]= ((u64)start_blk >> 24) & 0xff;
> > +			c->Request.CDB[7]= ((u64)start_blk >> 16) & 0xff;
> > +			c->Request.CDB[8]= ((u64)start_blk >>  8) & 0xff;
> 
> 	put_unaligned(cpu_to_be64(start_blk), &c->Request.CDB[2]);
> 
> which is what's happening here anyway.

Well ... this was debated a while ago ad nauseam:

http://marc.info/?t=117699555300010

The main objection to what you propose is that it forces the u64
coercion even in the 32 bit start_blk case.  The preferred solution as a
result of that debate was simply to us a macro Andrew introduced:

upper_32_bits()

Which will silently replace zero in the non LBD case.  I actually
thought this had already been done.

James


James


-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [SCSI Target Devel]     [Linux SCSI Target Infrastructure]     [Kernel Newbies]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Linux IIO]     [Samba]     [Device Mapper]
  Powered by Linux