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Message-Id: <20221211024647.2614394-1-masahiroy@kernel.org>
Date: Sun, 11 Dec 2022 11:46:47 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: linux-kbuild@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Masahiro Yamada <masahiroy@...nel.org>,
Palmer Dabbelt <palmer@...osinc.com>,
Albert Ou <aou@...s.berkeley.edu>,
Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Nicolas Schier <nicolas@...sle.eu>,
Palmer Dabbelt <palmer@...belt.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Thomas Gleixner <tglx@...utronix.de>,
Tom Rix <trix@...hat.com>, linux-riscv@...ts.infradead.org,
llvm@...ts.linux.dev, x86@...nel.org
Subject: [PATCH] kbuild: add test-{ge,gt,le,lt} macros
GNU Make 4.4 introduced $(intcmp ...), which is useful to compare two
integers without forking a new process.
Add test-{ge,gt,le,lt} macros, which work more efficiently with GNU
Make >= 4.4. For older Make versions, they fall back to the 'test'
shell command.
The first two parameters to $(intcmp ...) must not be empty. To avoid
the syntax error, I appended '0' to them. Fortunately, '00' is treated
as '0'. This is needed because CONFIG options may expand to an empty
string when the kernel configuration is not included.
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Acked-by: Palmer Dabbelt <palmer@...osinc.com> # RISC-V
---
Changes in v3:
- Use $(intcmp ...) instead of playing with $(sort ...)
Makefile | 2 +-
arch/riscv/Makefile | 2 +-
arch/x86/Makefile | 2 +-
scripts/Kbuild.include | 16 ++++++++++++++++
scripts/Makefile.compiler | 4 ++--
5 files changed, 21 insertions(+), 5 deletions(-)
diff --git a/Makefile b/Makefile
index fbd9ff4a61e7..8801cac4d3d5 100644
--- a/Makefile
+++ b/Makefile
@@ -993,7 +993,7 @@ KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
# Check for frame size exceeding threshold during prolog/epilog insertion
# when using lld < 13.0.0.
ifneq ($(CONFIG_FRAME_WARN),0)
-ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
+ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y)
KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
endif
endif
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 0d13b597cb55..faf2c2177094 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -37,7 +37,7 @@ else
endif
ifeq ($(CONFIG_LD_IS_LLD),y)
-ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0)
+ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 150000),y)
KBUILD_CFLAGS += -mno-relax
KBUILD_AFLAGS += -mno-relax
ifndef CONFIG_AS_IS_LLVM
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 415a5d138de4..e72c7a49cd59 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -211,7 +211,7 @@ endif
KBUILD_LDFLAGS += -m elf_$(UTS_MACHINE)
ifdef CONFIG_LTO_CLANG
-ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
+ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y)
KBUILD_LDFLAGS += -plugin-opt=-stack-alignment=$(if $(CONFIG_X86_32),4,8)
endif
endif
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index cbe28744637b..5019bc1e38e4 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -11,6 +11,22 @@ space := $(empty) $(empty)
space_escape := _-_SPACE_-_
pound := \#
+###
+# Comparison macros.
+# Usage: $(call test-lt, $(CONFIG_LLD_VERSION), 150000)
+#
+# Use $(intcmp ...) if supported. (Make >= 4.4)
+# Otherwise, fall back to the 'test' shell command.
+ifeq ($(intcmp 1,0,,,y),y)
+test-le = $(intcmp $(strip $1)0, $(strip $2)0,y,y,)
+test-lt = $(intcmp $(strip $1)0, $(strip $2)0,y,,)
+else
+test-le = $(shell test $(strip $1)0 -le $(strip $2)0 && echo y)
+test-lt = $(shell test $(strip $1)0 -lt $(strip $2)0 && echo y)
+endif
+test-ge = $(call test-le, $2, $1)
+test-gt = $(call test-lt, $2, $1)
+
###
# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
dot-target = $(dir $@).$(notdir $@)
diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
index 20d353dcabfb..3d8adfd34af1 100644
--- a/scripts/Makefile.compiler
+++ b/scripts/Makefile.compiler
@@ -63,11 +63,11 @@ cc-disable-warning = $(call try-run,\
# gcc-min-version
# Usage: cflags-$(call gcc-min-version, 70100) += -foo
-gcc-min-version = $(shell [ $(CONFIG_GCC_VERSION)0 -ge $(1)0 ] && echo y)
+gcc-min-version = $(call test-ge, $(CONFIG_GCC_VERSION), $1)
# clang-min-version
# Usage: cflags-$(call clang-min-version, 110000) += -foo
-clang-min-version = $(shell [ $(CONFIG_CLANG_VERSION)0 -ge $(1)0 ] && echo y)
+clang-min-version = $(call test-ge, $(CONFIG_CLANG_VERSION), $1)
# ld-option
# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
--
2.34.1
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