On Tue, 2015-04-07 at 10:07 +0200, leroy christophe wrote: > Le 21/03/2015 00:52, Scott Wood a écrit : > > On Fri, Dec 05, 2014 at 12:20:20PM +0100, LEROY Christophe wrote: > >> include/linux/mm.h: In function 'is_vmalloc_addr': > >> include/linux/mm.h:367:14: warning: comparison between signed and unsigned > >> integer expressions [-Wsign-compare] > >> return addr >= VMALLOC_START && addr < VMALLOC_END; > >> ^ > >> > >> Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr> > >> --- > >> arch/powerpc/include/asm/pgtable-ppc32.h | 2 +- > >> 1 file changed, 1 insertion(+), 1 deletion(-) > > That warning doesn't appear to be enabled. What config are you seeing > > this with? > I'm used to adding EXTRA_CFLAGS=-Wextra when checking my own drivers, > as it helps finding additional bugs.
It also produces a lot of noise, which is why Linux doesn't enable it. E.g. it enables useless "unused parameter" warnings all over the place. > When doing that, the only warnings I get outside of my own code are this > one, and the other one in my proposed patch identified "powerpc32: fix > warning from include/asm-generic/termios-base.h" > > I though it would be worth fixing those two warnings in order to get a > perfectly clean code. In general I don't think we should clutter up the code with suppression for warnings we don't enable, but in this case we do end up with a value that would be negative if considered as signed. Instead of changing VMALLOC_OFFSET, though, I'd address it where the problem is actually introduced -- which is casting high_memory to (long) rather than (unsigned long) or (uintptr_t). -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
