Messages in this thread | | | Date | Thu, 2 Jan 2020 03:51:46 +0800 | From | kbuild test robot <> | Subject | arch/x86/include/asm/string_32.h:182:25: warning: 'val' may be used uninitialized in this function |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 738d2902773e30939a982c8df7a7f94293659810 commit: 6c3edaf9fd6a3be7fb5bc6931897c24cd3848f84 tracing: Introduce trace event injection date: 4 weeks ago config: i386-randconfig-a003-20200102 (attached as .config) compiler: gcc-6 (Debian 6.3.0-18+deb9u1) 6.3.0 20170516 reproduce: git checkout 6c3edaf9fd6a3be7fb5bc6931897c24cd3848f84 # save the attached .config to linux build tree make ARCH=i386
If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@intel.com>
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/x86/include/asm/string.h:3:0, from include/linux/string.h:20, from arch/x86/include/asm/page_32.h:35, from arch/x86/include/asm/page.h:14, from arch/x86/include/asm/thread_info.h:12, from include/linux/thread_info.h:38, from arch/x86/include/asm/preempt.h:7, from include/linux/preempt.h:78, from include/linux/spinlock.h:51, from include/linux/seqlock.h:36, from include/linux/time.h:6, from include/linux/stat.h:19, from include/linux/module.h:10, from kernel/trace/trace_events_inject.c:8: kernel/trace/trace_events_inject.c: In function 'event_inject_write': >> arch/x86/include/asm/string_32.h:182:25: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized] #define memcpy(t, f, n) __builtin_memcpy(t, f, n) ^~~~~~~~~~~~~~~~ kernel/trace/trace_events_inject.c:200:6: note: 'val' was declared here u64 val; ^~~ -- In file included from arch/x86/include/asm/string.h:3:0, from include/linux/string.h:20, from arch/x86/include/asm/page_32.h:35, from arch/x86/include/asm/page.h:14, from arch/x86/include/asm/thread_info.h:12, from include/linux/thread_info.h:38, from arch/x86/include/asm/preempt.h:7, from include/linux/preempt.h:78, from include/linux/spinlock.h:51, from include/linux/seqlock.h:36, from include/linux/time.h:6, from include/linux/stat.h:19, from include/linux/module.h:10, from kernel//trace/trace_events_inject.c:8: kernel//trace/trace_events_inject.c: In function 'event_inject_write': >> arch/x86/include/asm/string_32.h:182:25: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized] #define memcpy(t, f, n) __builtin_memcpy(t, f, n) ^~~~~~~~~~~~~~~~ kernel//trace/trace_events_inject.c:200:6: note: 'val' was declared here u64 val; ^~~
vim +/val +182 arch/x86/include/asm/string_32.h
^1da177e4c3f41 include/asm-i386/string.h Linus Torvalds 2005-04-16 177 ^1da177e4c3f41 include/asm-i386/string.h Linus Torvalds 2005-04-16 178 /* ^1da177e4c3f41 include/asm-i386/string.h Linus Torvalds 2005-04-16 179 * No 3D Now! ^1da177e4c3f41 include/asm-i386/string.h Linus Torvalds 2005-04-16 180 */ ^1da177e4c3f41 include/asm-i386/string.h Linus Torvalds 2005-04-16 181 ff60fab71bb3b4 arch/x86/include/asm/string_32.h Arjan van de Ven 2009-09-28 @182 #define memcpy(t, f, n) __builtin_memcpy(t, f, n) ^1da177e4c3f41 include/asm-i386/string.h Linus Torvalds 2005-04-16 183
:::::: The code at line 182 was first introduced by commit :::::: ff60fab71bb3b4fdbf8caf57ff3739ffd0887396 x86: Use __builtin_memset and __builtin_memcpy for memset/memcpy
:::::: TO: Arjan van de Ven <arjan@infradead.org> :::::: CC: H. Peter Anvin <hpa@zytor.com>
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