[PATCH] mm: silence -Woverride-init/initializer-overrides

From: Qian Cai
Date: Tue Aug 27 2019 - 11:49:52 EST

When compiling a kernel with W=1, there are several of those warnings
due to arm64 override a field by purpose. Just disable those warnings
for both GCC and Clang of this file, so it will help dig "gems" hidden
in the W=1 warnings by reducing some noises.

mm/init-mm.c:39:2: warning: initializer overrides prior initialization
of this subobject [-Winitializer-overrides]
./arch/arm64/include/asm/mmu.h:133:9: note: expanded from macro
.pgd = init_pg_dir,
mm/init-mm.c:30:10: note: previous initialization is here
.pgd = swapper_pg_dir,

Note: there is a side project trying to support explicitly allowing
specific initializer overrides in Clang, but there is no guarantee it
will happen or not.


Signed-off-by: Qian Cai <cai@xxxxxx>
mm/Makefile | 3 +++
1 file changed, 3 insertions(+)

diff --git a/mm/Makefile b/mm/Makefile
index d0b295c3b764..5a30b8ecdc55 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -21,6 +21,9 @@ KCOV_INSTRUMENT_memcontrol.o := n
KCOV_INSTRUMENT_mmzone.o := n
KCOV_INSTRUMENT_vmstat.o := n

+CFLAGS_init-mm.o += $(call cc-disable-warning, override-init)
+CFLAGS_init-mm.o += $(call cc-disable-warning, initializer-overrides)
mmu-y := nommu.o
mmu-$(CONFIG_MMU) := highmem.o memory.o mincore.o \
mlock.o mmap.o mmu_gather.o mprotect.o mremap.o \