From: Vasily Gorbik Date: Mon, 27 Jan 2025 14:23:02 +0000 (+0100) Subject: s390/vmem: Fix null-pointer-arithmetic warning in vmem_map_init() X-Git-Tag: v6.14-rc1~36^2~4 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b05d66c882994fb63e8435bf64f262ef44c51874;p=thirdparty%2Flinux.git s390/vmem: Fix null-pointer-arithmetic warning in vmem_map_init() Fixes the following clang warning introduced by commit d7bebcb4a898 ("s390: Optimize __pa/__va when RANDOMIZE_IDENTITY_BASE is off") arch/s390/mm/vmem.c:665:36: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 665 | __set_memory_4k(__va(0), __va(0) + ident_map_size); | ~~~~~~~ ^ Fixes: d7bebcb4a898 ("s390: Optimize __pa/__va when RANDOMIZE_IDENTITY_BASE is off") Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202501270309.HzsVNo3o-lkp@intel.com/ Reviewed-by: Heiko Carstens Signed-off-by: Vasily Gorbik Signed-off-by: Alexander Gordeev --- diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index 7c684c54e7216..8ead999e340b6 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -662,7 +662,7 @@ void __init vmem_map_init(void) if (!static_key_enabled(&cpu_has_bear)) set_memory_x(0, 1); if (debug_pagealloc_enabled()) - __set_memory_4k(__va(0), __va(0) + ident_map_size); + __set_memory_4k(__va(0), absolute_pointer(__va(0)) + ident_map_size); pr_info("Write protected kernel read-only data: %luk\n", (unsigned long)(__end_rodata - _stext) >> 10); }