Hi Ming, [auto build test WARNING on linus/master] [also build test WARNING on v4.10-rc8] [cannot apply to next-20170216] [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/Ming-Lei/md-cleanup-on-direct-access-to-bvec-table/20170216-210357 config: powerpc-cell_defconfig (attached as .config) compiler: powerpc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705 reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=powerpc 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 >>): In file included from arch/powerpc/include/asm/page.h:331:0, from arch/powerpc/include/asm/thread_info.h:34, from include/linux/thread_info.h:25, from include/asm-generic/preempt.h:4, from ./arch/powerpc/include/generated/asm/preempt.h:1, from include/linux/preempt.h:59, from include/linux/spinlock.h:50, from include/linux/mmzone.h:7, from include/linux/gfp.h:5, from include/linux/slab.h:14, from drivers/md/raid1.c:34: drivers/md/raid1.c: In function 'raid1d': >> include/asm-generic/memory_model.h:54:52: warning: 'sbio_pages$' may be used uninitialized in this function [-Wmaybe-uninitialized] #define __page_to_pfn(page) (unsigned long)((page) - vmemmap) ^ drivers/md/raid1.c:2008:42: note: 'sbio_pages$' was declared here struct page *pbio_pages[RESYNC_PAGES], *sbio_pages[RESYNC_PAGES]; ^~~~~~~~~~ drivers/md/raid1.c:2075:9: warning: 'page_len$' may be used uninitialized in this function [-Wmaybe-uninitialized] if (memcmp(page_address(p), ^~~~~~~~~~~~~~~~~~~~~~~ page_address(s), ~~~~~~~~~~~~~~~~ page_len[j])) ~~~~~~~~~~~~ drivers/md/raid1.c:2007:6: note: 'page_len$' was declared here int page_len[RESYNC_PAGES]; ^~~~~~~~ In file included from arch/powerpc/include/asm/page.h:331:0, from arch/powerpc/include/asm/thread_info.h:34, from include/linux/thread_info.h:25, from include/asm-generic/preempt.h:4, from ./arch/powerpc/include/generated/asm/preempt.h:1, from include/linux/preempt.h:59, from include/linux/spinlock.h:50, from include/linux/mmzone.h:7, from include/linux/gfp.h:5, from include/linux/slab.h:14, from drivers/md/raid1.c:34: >> include/asm-generic/memory_model.h:54:52: warning: 'pbio_pages$' may be used uninitialized in this function [-Wmaybe-uninitialized] #define __page_to_pfn(page) (unsigned long)((page) - vmemmap) ^ drivers/md/raid1.c:2008:15: note: 'pbio_pages$' was declared here struct page *pbio_pages[RESYNC_PAGES], *sbio_pages[RESYNC_PAGES]; ^~~~~~~~~~ drivers/md/raid1.c:1978:8: warning: 'pages$' may be used uninitialized in this function [-Wmaybe-uninitialized] if (r1_sync_page_io(rdev, sect, s, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ pages[idx], ~~~~~~~~~~~ READ) != 0) ~~~~~ drivers/md/raid1.c:1872:15: note: 'pages$' was declared here struct page *pages[RESYNC_PAGES]; ^~~~~ vim +54 include/asm-generic/memory_model.h a117e66e KAMEZAWA Hiroyuki 2006-03-27 38 ({ unsigned long __pfn = (pfn); \ c5d71243 Rafael J. Wysocki 2008-11-08 39 unsigned long __nid = arch_pfn_to_nid(__pfn); \ a117e66e KAMEZAWA Hiroyuki 2006-03-27 40 NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\ a117e66e KAMEZAWA Hiroyuki 2006-03-27 41 }) a117e66e KAMEZAWA Hiroyuki 2006-03-27 42 67de6482 Andy Whitcroft 2006-06-23 43 #define __page_to_pfn(pg) \ aa462abe Ian Campbell 2011-08-17 44 ({ const struct page *__pg = (pg); \ a0140c1d KAMEZAWA Hiroyuki 2006-03-27 45 struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg)); \ a0140c1d KAMEZAWA Hiroyuki 2006-03-27 46 (unsigned long)(__pg - __pgdat->node_mem_map) + \ a0140c1d KAMEZAWA Hiroyuki 2006-03-27 47 __pgdat->node_start_pfn; \ a117e66e KAMEZAWA Hiroyuki 2006-03-27 48 }) a117e66e KAMEZAWA Hiroyuki 2006-03-27 49 8f6aac41 Christoph Lameter 2007-10-16 50 #elif defined(CONFIG_SPARSEMEM_VMEMMAP) 8f6aac41 Christoph Lameter 2007-10-16 51 af901ca1 André Goddard Rosa 2009-11-14 52 /* memmap is virtually contiguous. */ 8f6aac41 Christoph Lameter 2007-10-16 53 #define __pfn_to_page(pfn) (vmemmap + (pfn)) 32272a26 Martin Schwidefsky 2008-12-25 @54 #define __page_to_pfn(page) (unsigned long)((page) - vmemmap) 8f6aac41 Christoph Lameter 2007-10-16 55 a117e66e KAMEZAWA Hiroyuki 2006-03-27 56 #elif defined(CONFIG_SPARSEMEM) a117e66e KAMEZAWA Hiroyuki 2006-03-27 57 /* 1a49123b Zhang Yanfei 2013-10-03 58 * Note: section's mem_map is encoded to reflect its start_pfn. a117e66e KAMEZAWA Hiroyuki 2006-03-27 59 * section[i].section_mem_map == mem_map's address - start_pfn; a117e66e KAMEZAWA Hiroyuki 2006-03-27 60 */ 67de6482 Andy Whitcroft 2006-06-23 61 #define __page_to_pfn(pg) \ aa462abe Ian Campbell 2011-08-17 62 ({ const struct page *__pg = (pg); \ :::::: The code at line 54 was first introduced by commit :::::: 32272a26974d2027384fd4010cd1780fca425d94 [S390] __page_to_pfn warnings :::::: TO: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> :::::: CC: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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