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Subject[PATCH] kbuild: add machine size to CHEKCFLAGS
Date
By default, sparse assumes a 64bit machine when compiled on x86-64
and 32bit when compiled on anything else.

This can of course create all sort of problems for the other archs, like
issuing false warnings ('shift too big (32) for type unsigned long'), or
worse, failing to emit legitimate warnings.

Fix this by adding the -m32/-m64 flag, depending on CONFIG_64BIT,
to CHECKFLAGS in the main Makefile (and so for all archs).
Also, remove the now unneeded -m32/-m64 in arch specific Makefiles.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
Makefile | 3 +++
arch/alpha/Makefile | 2 +-
arch/arm/Makefile | 2 +-
arch/arm64/Makefile | 2 +-
arch/ia64/Makefile | 2 +-
arch/mips/Makefile | 3 ---
arch/parisc/Makefile | 2 +-
arch/sparc/Makefile | 2 +-
arch/x86/Makefile | 2 +-
9 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/Makefile b/Makefile
index 6c6610913..18379987c 100644
--- a/Makefile
+++ b/Makefile
@@ -881,6 +881,9 @@ endif
# insure the checker run with the right endianness
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)

+# the checker needs the correct machine size
+CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
+
# Default kernel image to build when no specific target is given.
# KBUILD_IMAGE may be overruled on the command line or
# set in the environment
diff --git a/arch/alpha/Makefile b/arch/alpha/Makefile
index 2cc3cc519..c5ec8c09c 100644
--- a/arch/alpha/Makefile
+++ b/arch/alpha/Makefile
@@ -11,7 +11,7 @@
NM := $(NM) -B

LDFLAGS_vmlinux := -static -N #-relax
-CHECKFLAGS += -D__alpha__ -m64
+CHECKFLAGS += -D__alpha__
cflags-y := -pipe -mno-fp-regs -ffixed-8
cflags-y += $(call cc-option, -fno-jump-tables)

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index e4e537f27..f32a5468d 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -135,7 +135,7 @@ endif
KBUILD_CFLAGS +=$(CFLAGS_ABI) $(CFLAGS_ISA) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float -Uarm
KBUILD_AFLAGS +=$(CFLAGS_ABI) $(AFLAGS_ISA) $(arch-y) $(tune-y) -include asm/unified.h -msoft-float

-CHECKFLAGS += -D__arm__ -m32
+CHECKFLAGS += -D__arm__

#Default value
head-y := arch/arm/kernel/head$(MMUEXT).o
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 87f7d2f9f..3c353b471 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -78,7 +78,7 @@ LDFLAGS += -maarch64linux
UTS_MACHINE := aarch64
endif

-CHECKFLAGS += -D__aarch64__ -m64
+CHECKFLAGS += -D__aarch64__

ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/arm64/kernel/module.lds
diff --git a/arch/ia64/Makefile b/arch/ia64/Makefile
index 2dd7f519a..45f59808b 100644
--- a/arch/ia64/Makefile
+++ b/arch/ia64/Makefile
@@ -18,7 +18,7 @@ READELF := $(CROSS_COMPILE)readelf

export AWK

-CHECKFLAGS += -m64 -D__ia64=1 -D__ia64__=1 -D_LP64 -D__LP64__
+CHECKFLAGS += -D__ia64=1 -D__ia64__=1 -D_LP64 -D__LP64__

OBJCOPYFLAGS := --strip-all
LDFLAGS_vmlinux := -static
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 5e9fce076..e2122cca4 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -309,9 +309,6 @@ ifdef CONFIG_MIPS
CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
egrep -vw '__GNUC_(|MINOR_|PATCHLEVEL_)_' | \
sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
-ifdef CONFIG_64BIT
-CHECKFLAGS += -m64
-endif
endif

OBJCOPYFLAGS += --remove-section=.reginfo
diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
index 348ae4779..714284ea6 100644
--- a/arch/parisc/Makefile
+++ b/arch/parisc/Makefile
@@ -28,7 +28,7 @@ export LIBGCC

ifdef CONFIG_64BIT
UTS_MACHINE := parisc64
-CHECKFLAGS += -D__LP64__=1 -m64
+CHECKFLAGS += -D__LP64__=1
CC_ARCHES = hppa64
LD_BFD := elf64-hppa-linux
else # 32-bit
diff --git a/arch/sparc/Makefile b/arch/sparc/Makefile
index edac927e4..966a13d2b 100644
--- a/arch/sparc/Makefile
+++ b/arch/sparc/Makefile
@@ -39,7 +39,7 @@ else
# sparc64
#

-CHECKFLAGS += -D__sparc__ -D__sparc_v9__ -D__arch64__ -m64
+CHECKFLAGS += -D__sparc__ -D__sparc_v9__ -D__arch64__
LDFLAGS := -m elf64_sparc
export BITS := 64
UTS_MACHINE := sparc64
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 60135cbd9..f0a6ea224 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -94,7 +94,7 @@ ifeq ($(CONFIG_X86_32),y)
else
BITS := 64
UTS_MACHINE := x86_64
- CHECKFLAGS += -D__x86_64__ -m64
+ CHECKFLAGS += -D__x86_64__

biarch := -m64
KBUILD_AFLAGS += -m64
--
2.17.0
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