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a69fe1a2c9
linux-next has been reporting gazillion warnings for ARC build and I finally decided to take a bite: http://kisskb.ellerman.id.au/kisskb/buildresult/12638735/ Most of the them are due to -Wmaybe-uninitialized | ../kernel/sysctl.c: In function '__do_proc_doulongvec_minmax': | ../kernel/sysctl.c:1928:12: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized] | ret = tmp - *buf; | ^ | ../kernel/sysctl.c:2342:29: note: 'p' was declared here | char *kbuf = NULL, *p; | ^ | ... | ... Cursory look at code seemed fine and a definite gcc false positive in say kernel/sysctl.c Mystery was why only for ARC (and not with ARM linaro toolchain based off same gcc 4.8). Turns out that -O3 (default for ARC) triggers these and if I enable -O3 for ARM kernel build, I see the same splat. I initially wanted to disable this only for gcc 4.8, but Arnd reported it is seen even on gcc 6.0 for ARM with -O3. Thus better to disable this independent of gcc version. Cc: Claudiu Zissulescu <Claudiu.Zissulescu@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Michal Marek <mmarek@suse.cz> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: linux-kbuild@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Vineet Gupta <vgupta@synopsys.com> |
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