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[66.187.233.206]) by smtp.gmail.com with ESMTPSA id w1sm8505153qte.36.2019.08.27.08.49.47 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 27 Aug 2019 08:49:48 -0700 (PDT) From: Qian Cai To: akpm@linux-foundation.org Cc: clang-built-linux@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Qian Cai Subject: [PATCH] mm: silence -Woverride-init/initializer-overrides Date: Tue, 27 Aug 2019 11:47:47 -0400 Message-Id: <1566920867-27453-1-git-send-email-cai@lca.pw> X-Mailer: git-send-email 1.8.3.1 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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] INIT_MM_CONTEXT(init_mm) ^~~~~~~~~~~~~~~~~~~~~~~~ ./arch/arm64/include/asm/mmu.h:133:9: note: expanded from macro 'INIT_MM_CONTEXT' .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. https://github.com/ClangBuiltLinux/linux/issues/639 Signed-off-by: Qian Cai --- 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 \