linux-kernel - Re: [PATCH] block: Silence spurious compiler warnings

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Message-Id: <20131128115020.8233b3447754df43eb36a325@canb.auug.org.au>
Date:	Thu, 28 Nov 2013 11:50:20 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Kent Overstreet <kmo@...erainc.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Olof Johansson <olof@...om.net>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] block: Silence spurious compiler warnings

Hi Kent,

On Tue, 26 Nov 2013 16:39:49 -0800 Kent Overstreet <kmo@...erainc.com> wrote:
>
> From 46e7081430f5f483906f496733a23f8e9d898879 Mon Sep 17 00:00:00 2001
> From: Kent Overstreet <kmo@...erainc.com>
> Date: Tue, 26 Nov 2013 16:36:49 -0800
> Subject: [PATCH] block: Silence spurious compiler warnings
> 
> Signed-off-by: Kent Overstreet <kmo@...erainc.com>

Unfortunately, that did not work :-(

I am till getting these warnings into today's linux-next after merging
the block tree (arm multi_v7_defconfig, gcc 4.6):

block/blk-merge.c: In function 'blk_rq_map_sg':
block/blk-merge.c:135:8: warning: 'bvprv.bv_page' may be used uninitialized in this function [-Wuninitialized]
block/blk-merge.c:173:23: note: 'bvprv.bv_page' was declared here
block/blk-merge.c:135:8: warning: 'bvprv.bv_len' may be used uninitialized in this function [-Wuninitialized]
block/blk-merge.c:173:23: note: 'bvprv.bv_len' was declared here
block/blk-merge.c:135:8: warning: 'bvprv.bv_offset' may be used uninitialized in this function [-Wuninitialized]
block/blk-merge.c:173:23: note: 'bvprv.bv_offset' was declared here
block/blk-merge.c: In function 'blk_bio_map_sg':
block/blk-merge.c:135:8: warning: 'bvprv.bv_offset' may be used uninitialized in this function [-Wuninitialized]
block/blk-merge.c:237:23: note: 'bvprv.bv_offset' was declared here
block/blk-merge.c:135:8: warning: 'bvprv.bv_len' may be used uninitialized in this function [-Wuninitialized]
block/blk-merge.c:237:23: note: 'bvprv.bv_len' was declared here
block/blk-merge.c:135:8: warning: 'bvprv.bv_page' may be used uninitialized in this function [-Wuninitialized]
block/blk-merge.c:237:23: note: 'bvprv.bv_page' was declared here
block/blk-merge.c: In function 'attempt_merge':
block/blk-merge.c:110:7: warning: 'end_bv.bv_offset' may be used uninitialized in this function [-Wuninitialized]
block/blk-merge.c:89:17: note: 'end_bv.bv_offset' was declared here
block/blk-merge.c:110:7: warning: 'end_bv.bv_len' may be used uninitialized in this function [-Wuninitialized]
block/blk-merge.c:89:17: note: 'end_bv.bv_len' was declared here
block/blk-merge.c:110:7: warning: 'end_bv.bv_page' may be used uninitialized in this function [-Wuninitialized]
block/blk-merge.c:89:17: note: 'end_bv.bv_page' was declared here

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

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