linux-kernel - [PATCH 1/2] riscv: pass endianness info to sparse

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Date:   Thu,  9 Nov 2017 06:53:53 +0100
From:   Luc Van Oostenryck <luc.vanoostenryck@...il.com>
To:     Palmer Dabbelt <palmer@...ive.com>
Cc:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Albert Ou <albert@...ive.com>, patches@...ups.riscv.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] riscv: pass endianness info to sparse

RISC-V is little-endian only but sparse assumes the same
endianness as the building machine.
This is problematic for code which expect __BYTE_ORDER__ being
correctly predefined by the compiler which sparse can then
pre-process differently from what gcc would, depending on the
building machine endianness.

To avoid any possible problem, fix this by letting sparse know
about the architecture endianness.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@...il.com>
---
 arch/riscv/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 6719dd30e..206484dde 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -16,6 +16,8 @@ KBUILD_CFLAGS_MODULE += -fPIC

 KBUILD_DEFCONFIG = defconfig

+CHECKFLAGS += -mlittle-endian
+
 export BITS
 ifeq ($(CONFIG_ARCH_RV64I),y)
 	BITS := 64
-- 
2.14.0