From mboxrd@z Thu Jan 1 00:00:00 1970 From: fengguang.wu@intel.com (kbuild test robot) Date: Fri, 14 Oct 2016 20:51:25 +0800 Subject: [arm-soc:to-build 7/7] include/asm-generic/memory_model.h:33:53: warning: 'buddy' may be used uninitialized in this function Message-ID: <201610142018.XeOegRBH%fengguang.wu@intel.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org tree: https://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git to-build head: 3f5089cbac8f9e64f3f0b37fae0f15ac542c8d4a commit: 3f5089cbac8f9e64f3f0b37fae0f15ac542c8d4a [7/7] Revert "Disable "maybe-uninitialized" warning globally" config: ia64-tiger_defconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 6.2.0 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 git checkout 3f5089cbac8f9e64f3f0b37fae0f15ac542c8d4a # save the attached .config to linux build tree make.cross ARCH=ia64 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/ia64/include/asm/page.h:110:0, from arch/ia64/include/asm/ptrace.h:45, from arch/ia64/include/asm/processor.h:19, from arch/ia64/include/asm/thread_info.h:11, from include/linux/thread_info.h:69, from include/asm-generic/preempt.h:4, from ./arch/ia64/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/mm.h:9, from mm/page_alloc.c:18: mm/page_alloc.c: In function '__free_pages_ok': >> include/asm-generic/memory_model.h:33:53: warning: 'buddy' may be used uninitialized in this function [-Wmaybe-uninitialized] #define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ ^ mm/page_alloc.c:788:15: note: 'buddy' was declared here struct page *buddy; ^~~~~ In file included from arch/ia64/include/asm/page.h:110:0, from arch/ia64/include/asm/ptrace.h:45, from arch/ia64/include/asm/processor.h:19, from arch/ia64/include/asm/thread_info.h:11, from include/linux/thread_info.h:69, from include/asm-generic/preempt.h:4, from ./arch/ia64/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/mm.h:9, from mm/page_alloc.c:18: mm/page_alloc.c: In function 'free_pcppages_bulk': >> include/asm-generic/memory_model.h:33:53: warning: 'buddy' may be used uninitialized in this function [-Wmaybe-uninitialized] #define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ ^ mm/page_alloc.c:788:15: note: 'buddy' was declared here struct page *buddy; ^~~~~ vim +/buddy +33 include/asm-generic/memory_model.h a117e66e KAMEZAWA Hiroyuki 2006-03-27 17 #define arch_pfn_to_nid(pfn) pfn_to_nid(pfn) a117e66e KAMEZAWA Hiroyuki 2006-03-27 18 #endif a117e66e KAMEZAWA Hiroyuki 2006-03-27 19 a117e66e KAMEZAWA Hiroyuki 2006-03-27 20 #ifndef arch_local_page_offset a117e66e KAMEZAWA Hiroyuki 2006-03-27 21 #define arch_local_page_offset(pfn, nid) \ a117e66e KAMEZAWA Hiroyuki 2006-03-27 22 ((pfn) - NODE_DATA(nid)->node_start_pfn) a117e66e KAMEZAWA Hiroyuki 2006-03-27 23 #endif a117e66e KAMEZAWA Hiroyuki 2006-03-27 24 a117e66e KAMEZAWA Hiroyuki 2006-03-27 25 #endif /* CONFIG_DISCONTIGMEM */ a117e66e KAMEZAWA Hiroyuki 2006-03-27 26 a117e66e KAMEZAWA Hiroyuki 2006-03-27 27 /* a117e66e KAMEZAWA Hiroyuki 2006-03-27 28 * supports 3 memory models. a117e66e KAMEZAWA Hiroyuki 2006-03-27 29 */ a117e66e KAMEZAWA Hiroyuki 2006-03-27 30 #if defined(CONFIG_FLATMEM) a117e66e KAMEZAWA Hiroyuki 2006-03-27 31 67de6482 Andy Whitcroft 2006-06-23 32 #define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET)) 67de6482 Andy Whitcroft 2006-06-23 @33 #define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ a117e66e KAMEZAWA Hiroyuki 2006-03-27 34 ARCH_PFN_OFFSET) a117e66e KAMEZAWA Hiroyuki 2006-03-27 35 #elif defined(CONFIG_DISCONTIGMEM) a117e66e KAMEZAWA Hiroyuki 2006-03-27 36 67de6482 Andy Whitcroft 2006-06-23 37 #define __pfn_to_page(pfn) \ 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 }) :::::: The code at line 33 was first introduced by commit :::::: 67de648211fa041fe08a0c25241a4980bbb90698 [PATCH] squash duplicate page_to_pfn and pfn_to_page :::::: TO: Andy Whitcroft :::::: CC: Linus Torvalds --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation -------------- next part -------------- A non-text attachment was scrubbed... Name: .config.gz Type: application/gzip Size: 16068 bytes Desc: not available URL: