linux-kernel - [PATCH 2/5] scsi: aacraid: Use vsprintf %phNX extension

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Message-Id: <e628558ecaea44a8f1a99dc19213346fb1ee3b18.1630003183.git.joe@perches.com>
Date:   Thu, 26 Aug 2021 11:43:02 -0700
From:   Joe Perches <joe@...ches.com>
To:     Adaptec OEM Raid Solutions <aacraid@...rosemi.com>
Cc:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] scsi: aacraid: Use vsprintf %phNX extension

Reduce object size by using the %phNX extension to format a sysfs output
buffer with identical output.

compiled x86-64 defconfig w/ aacraid and gcc 10.3.0

$ size drivers/scsi/aacraid/linit.o*
   text	   data	    bss	    dec	    hex	filename
  18616	   4056	      0	  22672	   5890	drivers/scsi/aacraid/linit.o.new
  18951	   4056	      0	  23007	   59df	drivers/scsi/aacraid/linit.o.old

Signed-off-by: Joe Perches <joe@...ches.com>
---
 drivers/scsi/aacraid/linit.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index 3168915adaa75..165e6e10f07b9 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -587,12 +587,7 @@ static ssize_t aac_show_unique_id(struct device *dev,
 	if (sdev_channel(sdev) == CONTAINER_CHANNEL)
 		memcpy(sn, aac->fsa_dev[sdev_id(sdev)].identifier, sizeof(sn));
 
-	return snprintf(buf, 16 * 2 + 2,
-		"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X\n",
-		sn[0], sn[1], sn[2], sn[3],
-		sn[4], sn[5], sn[6], sn[7],
-		sn[8], sn[9], sn[10], sn[11],
-		sn[12], sn[13], sn[14], sn[15]);
+	return snprintf(buf, 16 * 2 + 2, "%16phNX\n", sn);
 }
 
 static struct device_attribute aac_unique_id_attr = {
-- 
2.30.0