Hi NeilBrown, [auto build test WARNING on next-20170330] [cannot apply to md/master md/for-next block/for-next linus/master v4.9-rc8 v4.9-rc7 v4.9-rc6 v4.11-rc5] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/NeilBrown/Simplify-bio-splitting-and-related-code/20170406-045741 config: x86_64-randconfig-x007-201714 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/md/raid5.c: In function 'raid5_make_request': >> drivers/md/raid5.c:5554:6: warning: 'split' may be used uninitialized in this function [-Wmaybe-uninitialized] if (!bi) ^ vim +/split +5554 drivers/md/raid5.c 828cbe98 Shaohua Li 2015-09-02 5538 /* ret == -EAGAIN, fallback */ 3bddb7f8 Song Liu 2016-11-18 5539 /* 3bddb7f8 Song Liu 2016-11-18 5540 * if r5l_handle_flush_request() didn't clear REQ_PREFLUSH, 3bddb7f8 Song Liu 2016-11-18 5541 * we need to flush journal device 3bddb7f8 Song Liu 2016-11-18 5542 */ 3bddb7f8 Song Liu 2016-11-18 5543 do_flush = bi->bi_opf & REQ_PREFLUSH; 828cbe98 Shaohua Li 2015-09-02 5544 } e5dcdd80 NeilBrown 2005-09-09 5545 9ffc8f7c Eric Mei 2015-03-18 5546 /* 9ffc8f7c Eric Mei 2015-03-18 5547 * If array is degraded, better not do chunk aligned read because 9ffc8f7c Eric Mei 2015-03-18 5548 * later we might have to read it again in order to reconstruct 9ffc8f7c Eric Mei 2015-03-18 5549 * data on failed drives. 9ffc8f7c Eric Mei 2015-03-18 5550 */ 9ffc8f7c Eric Mei 2015-03-18 5551 if (rw == READ && mddev->degraded == 0 && 7ef6b12a Ming Lin 2015-05-06 5552 mddev->reshape_position == MaxSector) { 7ef6b12a Ming Lin 2015-05-06 5553 bi = chunk_aligned_read(mddev, bi); 7ef6b12a Ming Lin 2015-05-06 @5554 if (!bi) 5a7bbad2 Christoph Hellwig 2011-09-12 5555 return; 7ef6b12a Ming Lin 2015-05-06 5556 } 52488615 Raz Ben-Jehuda(caro 2006-12-10 5557) 796a5cf0 Mike Christie 2016-06-05 5558 if (unlikely(bio_op(bi) == REQ_OP_DISCARD)) { 620125f2 Shaohua Li 2012-10-11 5559 make_discard_request(mddev, bi); 620125f2 Shaohua Li 2012-10-11 5560 return; 620125f2 Shaohua Li 2012-10-11 5561 } 620125f2 Shaohua Li 2012-10-11 5562 :::::: The code at line 5554 was first introduced by commit :::::: 7ef6b12a1966f273afb750e19e1e8129bea48fec md/raid5: split bio for chunk_aligned_read :::::: TO: Ming Lin <ming.l@xxxxxxxxxxxxxxx> :::::: CC: Jens Axboe <axboe@xxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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