On Mon, Nov 25, 2013 at 7:35 PM, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote: > Hi all, > > On Tue, 26 Nov 2013 13:29:46 +1100 Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote: >> >> After merging the block tree, today's linux-next build (arm >> multi_v7_defconfig) produced these warnings: >> >> block/blk-merge.c: In function 'blk_rq_map_sg': >> block/blk-merge.c:133:8: warning: 'bvprv.bv_len' may be used uninitialized in this function [-Wuninitialized] >> block/blk-merge.c:171:23: note: 'bvprv.bv_len' was declared here >> block/blk-merge.c:133:8: warning: 'bvprv.bv_page' may be used uninitialized in this function [-Wuninitialized] >> block/blk-merge.c:171:23: note: 'bvprv.bv_page' was declared here >> block/blk-merge.c:133:8: warning: 'bvprv.bv_offset' may be used uninitialized in this function [-Wuninitialized] >> block/blk-merge.c:171:23: note: 'bvprv.bv_offset' was declared here >> block/blk-merge.c: In function 'blk_bio_map_sg': >> block/blk-merge.c:133:8: warning: 'bvprv.bv_len' may be used uninitialized in this function [-Wuninitialized] >> block/blk-merge.c:233:23: note: 'bvprv.bv_len' was declared here >> block/blk-merge.c:133:8: warning: 'bvprv.bv_offset' may be used uninitialized in this function [-Wuninitialized] >> block/blk-merge.c:233:23: note: 'bvprv.bv_offset' was declared here >> block/blk-merge.c:133:8: warning: 'bvprv.bv_page' may be used uninitialized in this function [-Wuninitialized] >> block/blk-merge.c:233:23: note: 'bvprv.bv_page' was declared here >> block/blk-merge.c: In function 'attempt_merge': >> block/blk-merge.c:108:7: 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:108:7: 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 >> block/blk-merge.c:108:7: 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 >> >> arm has its own definition of BIOVEC_PHYS_MERGEABLE() if that is relevant. > > For an easier test case, the i386 defcongig does this as well. I just noticed that i see this with gcc 4.7.0, but 4.8.1 does not warn. -Olof -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
