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[AUTOSEL,for,3.18,047/101] arm64: pass endianness info to sparse

Message ID 20180409003505.164715-47-alexander.levin@microsoft.com (mailing list archive)
State New, archived
Headers show

Commit Message

Sasha Levin April 9, 2018, 12:35 a.m. UTC 
From: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>

[ Upstream commit bcde519e8c325f3cc1fcf443eb6466e6bb3a3aca ]

ARM64 depends on the macro __AARCH64EB__ being defined or not
to correctly select or define endian-specific macros, structures
or pieces of code.

This macro is predefined by the compiler but sparse knows nothing
about it and thus may pre-process files differently from what
gcc would.

Fix this by passing '-D__AARCH64EL__' or '-D__AARCH64EB__' to
sparse depending of the endianness of the kernel, like defined
by GCC.

Note: In most case it won't change anything since most arm64 use
      little-endian (but an allyesconfig would use big-endian!).

CC: Catalin Marinas <catalin.marinas@arm.com>
CC: Will Deacon <will.deacon@arm.com>
CC: linux-arm-kernel@lists.infradead.org
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 arch/arm64/Makefile | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 3e2f6590666a..203d87177172 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -24,10 +24,12 @@  KBUILD_CFLAGS	+= $(call cc-option, -mpc-relative-literal-loads)
 
 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
 KBUILD_CPPFLAGS	+= -mbig-endian
+CHECKFLAGS	+= -D__AARCH64EB__
 AS		+= -EB
 LD		+= -EB
 else
 KBUILD_CPPFLAGS	+= -mlittle-endian
+CHECKFLAGS	+= -D__AARCH64EL__
 AS		+= -EL
 LD		+= -EL
 endif