[PATCH] arm64/cache: silence -Woverride-init warnings

[Qian Cai]

The commit 155433cb365e ("arm64: cache: Remove support for ASID-tagged
VIVT I-caches") introduced some compiation warnings from GCC (and
Clang) with -Winitializer-overrides),

arch/arm64/kernel/cpuinfo.c:38:26: warning: initialized field
overwritten [-Woverride-init]
[ICACHE_POLICY_VIPT]  = "VIPT",
                        ^~~~~~
arch/arm64/kernel/cpuinfo.c:38:26: note: (near initialization for
'icache_policy_str[2]')
arch/arm64/kernel/cpuinfo.c:39:26: warning: initialized field
overwritten [-Woverride-init]
[ICACHE_POLICY_PIPT]  = "PIPT",
                        ^~~~~~
arch/arm64/kernel/cpuinfo.c:39:26: note: (near initialization for
'icache_policy_str[3]')
arch/arm64/kernel/cpuinfo.c:40:27: warning: initialized field
overwritten [-Woverride-init]
[ICACHE_POLICY_VPIPT]  = "VPIPT",
                         ^~~~~~~
arch/arm64/kernel/cpuinfo.c:40:27: note: (near initialization for
'icache_policy_str[0]')

because it initializes icache_policy_str[0 ... 3] twice. Since
arm64 developers are keen to keep the style of initializing a static
array with a non-zero pattern first, just disable those warnings for
both GCC and Clang of this file.

Fixes: 155433cb365e ("arm64: cache: Remove support for ASID-tagged VIVT I-caches")
Signed-off-by: Qian Cai <cai@xxxxxx>
---
 arch/arm64/kernel/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 478491f07b4f..397ed5f7be1e 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -11,6 +11,9 @@ CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
 CFLAGS_REMOVE_insn.o = $(CC_FLAGS_FTRACE)
 CFLAGS_REMOVE_return_address.o = $(CC_FLAGS_FTRACE)
 
+CFLAGS_cpuinfo.o += $(call cc-disable-warning, override-init)
+CFLAGS_cpuinfo.o += $(call cc-disable-warning, initializer-overrides)
+
 # Object file lists.
 obj-y			:= debug-monitors.o entry.o irq.o fpsimd.o		\
 			   entry-fpsimd.o process.o ptrace.o setup.o signal.o	\
-- 
2.20.1 (Apple Git-117)