linux-kernel - RE: [PATCH 08/10] ARM: s3c24xx: enable CONFIG_BUG for tct

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Date:	Fri, 10 Aug 2012 15:07:37 +0900
From:	Kukjin Kim <kgene.kim@...sung.com>
To:	'Arnd Bergmann' <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org
Cc:	arm@...nel.org, linux-kernel@...r.kernel.org,
	'Ben Dooks' <ben-linux@...ff.org>
Subject: RE: [PATCH 08/10] ARM: s3c24xx: enable CONFIG_BUG for tct_hammer

Arnd Bergmann wrote:
> 
> Disabling CONFIG_BUG creates an insane amount of build warnings, which
> makes it useless to check for building defconfigs to see if new
> warnings show up.
> 
> Without this patch, building tct_hammer_defconfig results in:
> 
> net/packet/af_packet.c: In function 'tpacket_rcv':
> net/packet/af_packet.c:1889:30: warning: 'hdrlen' may be used
> uninitialized in this function [-Wuninitialized]
> net/core/ethtool.c: In function 'ethtool_get_feature_mask':
> net/core/ethtool.c:213:1: warning: control reaches end of non-void
> function [-Wreturn-type]
> block/cfq-iosched.c: In function 'cfq_async_queue_prio':
> block/cfq-iosched.c:2914:1: warning: control reaches end of non-void
> function [-Wreturn-type]
> mm/bootmem.c: In function 'mark_bootmem':
> mm/bootmem.c:352:1: warning: control reaches end of non-void function [-
> Wreturn-type]
> net/core/dev.c: In function 'skb_warn_bad_offload':
> net/core/dev.c:1904:33: warning: unused variable 'null_features' [-
> Wunused-variable]
> drivers/mtd/chips/cfi_probe.c: In function 'cfi_chip_setup':
> include/linux/mtd/cfi.h:489:3: warning: 'r.x[0]' may be used uninitialized
> in this function [-Wuninitialized]
> include/linux/mtd/map.h:394:11: note: 'r.x[0]' was declared here
> include/linux/mtd/cfi.h:489:3: warning: 'r.x[0]' may be used uninitialized
> in this function [-Wuninitialized]
> (and many more)
> 
> The size of vmlinux increases by 1.78% because of this:
> 
> size obj-arm/vmlinux.nobug
>    text    data     bss     dec     hex filename
>    2108474  116916   55352 2280742  22cd26 obj-arm/vmlinux
> size obj-arm/vmlinux.bug
>    text    data     bss     dec     hex filename
>    2150804  116916   53696 2321416  236c08 obj-arm/vmlinux
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Cc: Kukjin Kim <kgene.kim@...sung.com>

Acked-by: Kukjin Kim <kgene.kim@...sung.com>

BTW, I'm not sure we should still keep the tct_hammer_defconfig because
s3c2410_defconfig is including MACH_TCT_HAMMER, its selection are different
though.

Thanks.

Best regards,
Kgene.
--
Kukjin Kim <kgene.kim@...sung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.


> Cc: Ben Dooks <ben-linux@...ff.org>
> ---
>  arch/arm/configs/tct_hammer_defconfig |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/configs/tct_hammer_defconfig
> b/arch/arm/configs/tct_hammer_defconfig
> index 1d24f84..71277a1 100644
> --- a/arch/arm/configs/tct_hammer_defconfig
> +++ b/arch/arm/configs/tct_hammer_defconfig
> @@ -7,7 +7,7 @@ CONFIG_SYSFS_DEPRECATED_V2=y
>  CONFIG_BLK_DEV_INITRD=y
>  CONFIG_EXPERT=y
>  # CONFIG_KALLSYMS is not set
> -# CONFIG_BUG is not set
> +# CONFIG_BUGVERBOSE is not set
>  # CONFIG_ELF_CORE is not set
>  # CONFIG_SHMEM is not set
>  CONFIG_SLOB=y
> --
> 1.7.10

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