CHROMIUM: arm64: Disable asm-operand-width warning for clang
clang raises 'asm-operand-widths' warnings in inline assembly code when
the size of an operand is < 64 bits and the operand width is unspecified.
Most warnings are raised in macros, i.e. the datatype of the operand may
vary. Most of these warnings are fixed in upstream, however we consider it
isn't worth the effort/risk to backport all the necessary changes. On
future CrOS kernels >= v4.13 the warning should be re-enabled.
Change-Id: Ie44748344853f5a394879718ad5d6f610f3c396a
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 13a64c9..ab22981 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -77,6 +77,10 @@
TEXT_OFFSET := 0x00080000
endif
+ifeq ($(cc-name),clang)
+KBUILD_CFLAGS += $(call cc-disable-warning, asm-operand-widths)
+endif
+
# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
# in 32-bit arithmetic
KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \