linux-kernel - Re: my handy-dandy, "coding style" script

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Date:	Fri, 22 Dec 2006 00:29:52 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Joe Perches <joe@...ches.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	akpm@...l.org
Subject: Re: my handy-dandy, "coding style" script


On Dec 21 2006 14:53, Joe Perches wrote:
>On Thu, 2006-12-21 at 21:52 +0100, Jan Engelhardt wrote:
>> http://lkml.org/lkml/2006/9/30/208
>
>@@ -1302,7 +1302,7 @@ static int acpi_battery_add(struct acpi_
> 		battery->init_state = 1;
> 	}
> 
>-	(void)sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
>+	sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
>
>These casts can eliminate "return value unused" warnings.

But only when functions are tagged __must_check, and sprintf is not. 
cmpxchg is one where (void) is 'needed', __as I wrote__ in a cxgb3 
comment.

After applying this patch, there are no additional warnings:

00:19 ichi:/erk/kernel/linux-2.6.20-rc1 > make drivers/acpi/sbs.o
  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  CC [M]  drivers/acpi/sbs.o
00:21 ichi:/erk/kernel/linux-2.6.20-rc1 > grep MUST .config
CONFIG_ENABLE_MUST_CHECK=y

akpm, please include.

---

Remove some unnecessary (void) casts.

Signed-off-by: Jan Engelhardt <jengelh@....de>

Index: linux-2.6.20-rc1/drivers/acpi/sbs.c
===================================================================
--- linux-2.6.20-rc1.orig/drivers/acpi/sbs.c
+++ linux-2.6.20-rc1/drivers/acpi/sbs.c
@@ -1160,14 +1160,14 @@ acpi_battery_write_alarm(struct file *fi
 	if (result) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 				  "acpi_battery_set_alarm() failed\n"));
-		(void)acpi_battery_set_alarm(battery, old_alarm);
+		acpi_battery_set_alarm(battery, old_alarm);
 		goto end;
 	}
 	result = acpi_battery_get_alarm(battery);
 	if (result) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 				  "acpi_battery_get_alarm() failed\n"));
-		(void)acpi_battery_set_alarm(battery, old_alarm);
+		acpi_battery_set_alarm(battery, old_alarm);
 		goto end;
 	}
 
@@ -1302,7 +1302,7 @@ static int acpi_battery_add(struct acpi_
 		battery->init_state = 1;
 	}
 
-	(void)sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
+	sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
 
 	result = acpi_sbs_generic_add_fs(&battery->battery_entry,
 					 acpi_battery_dir,
@@ -1485,7 +1485,7 @@ static int acpi_sbs_update_run(struct ac
 		}
 
 		if (old_battery_present != new_battery_present) {
-			(void)sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
+			sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
 			result = acpi_sbs_generate_event(sbs->device,
 							 ACPI_SBS_BATTERY_NOTIFY_STATUS,
 							 new_battery_present,
@@ -1498,7 +1498,7 @@ static int acpi_sbs_update_run(struct ac
 			}
 		}
 		if (old_remaining_capacity != battery->state.remaining_capacity) {
-			(void)sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
+			sprintf(dir_name, ACPI_BATTERY_DIR_NAME, id);
 			result = acpi_sbs_generate_event(sbs->device,
 							 ACPI_SBS_BATTERY_NOTIFY_STATUS,
 							 new_battery_present,


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