From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: [PATCH] ata: Clean up hard coded array size calculation. Date: Wed, 11 Nov 2009 18:10:13 -0500 Message-ID: <4AFB4455.3040407@pobox.com> References: <1257708657-1232-1-git-send-email-tfransosi@gmail.com> <4AF8F363.3010806@rtr.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from srv5.dvmed.net ([207.36.208.214]:54418 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759529AbZKKXKR (ORCPT ); Wed, 11 Nov 2009 18:10:17 -0500 In-Reply-To: <4AF8F363.3010806@rtr.ca> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Mark Lord Cc: Thiago Farina , mlord@pobox.com, linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org On 11/10/2009 12:00 AM, Mark Lord wrote: > Thiago Farina wrote: >> Use ARRAY_SIZE macro of kernel api instead. >> >> Signed-off-by: Thiago Farina >> --- >> drivers/ata/sata_mv.c | 2 +- >> 1 files changed, 1 insertions(+), 1 deletions(-) >> >> diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c >> index 6f5093b..a8a7be0 100644 >> --- a/drivers/ata/sata_mv.c >> +++ b/drivers/ata/sata_mv.c >> @@ -2217,7 +2217,7 @@ static unsigned int mv_qc_issue_fis(struct >> ata_queued_cmd *qc) >> int err = 0; >> >> ata_tf_to_fis(&qc->tf, link->pmp, 1, (void *)fis); >> - err = mv_send_fis(ap, fis, sizeof(fis) / sizeof(fis[0])); >> + err = mv_send_fis(ap, fis, ARRAY_SIZE(fis)); >> if (err) >> return err; >> > .. > > What's the point of this ? > > There is no "hardcoded array size" there to begin with, > and using that silly macro obscures the actual calculation. > > So now, instead of being able to verify correctness at a glance, > I have to go off and research some silly macro and verify that > it does the right thing. It is a standard cleanup for all kernel code, and it does make the code more readable to the casual reader / quick skimmer. Jeff