Kernel test robot reported: ''' mm/kasan/report.c:637 kasan_non_canonical_hook() warn: unsigned 'addr' is never less than zero. ''' The KASAN_SHADOW_OFFSET is 0 on loongarch64. To fix it,check the KASAN_SHADOW_OFFSET before do comparison. Signed-off-by: Haibo Li <haibo.li@xxxxxxxxxxxx> Reported-by: kernel test robot <lkp@xxxxxxxxx> Closes: https://lore.kernel.org/oe-kbuild-all/ 202311270743.3oTCwYPd-lkp@xxxxxxxxx/ --- mm/kasan/report.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/kasan/report.c b/mm/kasan/report.c index e77facb62900..dafec2df0268 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -634,10 +634,10 @@ void kasan_non_canonical_hook(unsigned long addr) { unsigned long orig_addr; const char *bug_type; - +#if KASAN_SHADOW_OFFSET > 0 if (addr < KASAN_SHADOW_OFFSET) return; - +#endif orig_addr = (addr - KASAN_SHADOW_OFFSET) << KASAN_SHADOW_SCALE_SHIFT; /* * For faults near the shadow address for NULL, we can be fairly certain -- 2.18.0
