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arm64: Disable asm-operand-width warning for clang

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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.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>

nc: I trimmed the original commit message since I'm not a part of CrOS
    and can't speak on their behalf.

    To fix these warnings, it requires a fairly intrusive backport of
    the sysreg conversion that Mark Rutland did in 4.9. I think
    disabling the warning is smarter, similar to commit d41d0fe374
    ("turn off -Wattribute-alias") in this tree.

Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matthias Kaehlcke 2017-04-21 16:00:56 -07:00 • committed by Greg Kroah-Hartman
parent c695cffc9f
commit 2b92e27f26
1 changed files with 4 additions and 0 deletions
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4
arch/arm64/Makefile
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@ -56,6 +56,10 @@ else
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" $$(( \