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* [PATCH] arch: vdso: remove if-conditionals of $(c-gettimeofday-y)
@ 2021-07-31  5:57 Masahiro Yamada
  2021-08-25  3:49 ` Palmer Dabbelt
  0 siblings, 1 reply; 2+ messages in thread
From: Masahiro Yamada @ 2021-07-31  5:57 UTC (permalink / raw)
  To: Andy Lutomirski, Thomas Gleixner, Vincenzo Frascino, linux-kernel
  Cc: Masahiro Yamada, Will Deacon, Thomas Bogendoerfer,
	Palmer Dabbelt, Michael Ellerman, Catalin Marinas,
	Benjamin Herrenschmidt, linux-mips, Paul Mackerras, linux-riscv,
	Albert Ou, linuxppc-dev, Russell King, linux-arm-kernel,
	Paul Walmsley

arm, arm64, mips, powerpc always select GENERIC_GETTIMEOFDAY, hence
$(gettimeofday-y) never becomes empty.

riscv conditionally selects GENERIC_GETTIMEOFDAY when MMU=y && 64BIT=y,
but arch/riscv/kernel/vdso/vgettimeofday.o is built only under that
condition. So, you can always define CFLAGS_vgettimeofday.o

Remove all the meaningless conditionals.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

 arch/arm/vdso/Makefile              |  4 ----
 arch/arm64/kernel/vdso/Makefile     |  5 +----
 arch/arm64/kernel/vdso32/Makefile   |  3 ---
 arch/mips/vdso/Makefile             |  2 --
 arch/powerpc/kernel/vdso32/Makefile | 14 ++++++--------
 arch/powerpc/kernel/vdso64/Makefile | 14 ++++++--------
 arch/riscv/kernel/vdso/Makefile     |  5 +----
 7 files changed, 14 insertions(+), 33 deletions(-)

diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile
index 7c9e395b77f7..d996b57ca19d 100644
--- a/arch/arm/vdso/Makefile
+++ b/arch/arm/vdso/Makefile
@@ -29,11 +29,7 @@ CFLAGS_REMOVE_vdso.o = -pg
 
 # Force -O2 to avoid libgcc dependencies
 CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(GCC_PLUGINS_CFLAGS)
-ifeq ($(c-gettimeofday-y),)
-CFLAGS_vgettimeofday.o = -O2
-else
 CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y)
-endif
 
 # Disable gcov profiling for VDSO code
 GCOV_PROFILE := n
diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
index 945e6bb326e3..5545c28e0e6e 100644
--- a/arch/arm64/kernel/vdso/Makefile
+++ b/arch/arm64/kernel/vdso/Makefile
@@ -37,10 +37,7 @@ OBJECT_FILES_NON_STANDARD	:= y
 KCOV_INSTRUMENT			:= n
 
 CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny -fasynchronous-unwind-tables
-
-ifneq ($(c-gettimeofday-y),)
-  CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
-endif
+CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
 
 # Disable gcov profiling for VDSO code
 GCOV_PROFILE := n
diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
index 3dba0c4f8f42..330111046afc 100644
--- a/arch/arm64/kernel/vdso32/Makefile
+++ b/arch/arm64/kernel/vdso32/Makefile
@@ -133,10 +133,7 @@ hostprogs := $(munge)
 
 c-obj-vdso := note.o
 c-obj-vdso-gettimeofday := vgettimeofday.o
-
-ifneq ($(c-gettimeofday-y),)
 VDSO_CFLAGS_gettimeofday_o += -include $(c-gettimeofday-y)
-endif
 
 VDSO_CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os
 
diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile
index 1b2ea34c3d3b..c409d551972a 100644
--- a/arch/mips/vdso/Makefile
+++ b/arch/mips/vdso/Makefile
@@ -36,7 +36,6 @@ cflags-vdso := $(ccflags-vdso) \
 aflags-vdso := $(ccflags-vdso) \
 	-D__ASSEMBLY__ -Wa,-gdwarf-2
 
-ifneq ($(c-gettimeofday-y),)
 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
 
 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
@@ -44,7 +43,6 @@ CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
 # Note: Needs to be included before than the generic library.
 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
-endif
 
 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
 
diff --git a/arch/powerpc/kernel/vdso32/Makefile b/arch/powerpc/kernel/vdso32/Makefile
index 7d9a6fee0e3d..2386abc6fa58 100644
--- a/arch/powerpc/kernel/vdso32/Makefile
+++ b/arch/powerpc/kernel/vdso32/Makefile
@@ -7,14 +7,12 @@ include $(srctree)/lib/vdso/Makefile
 
 obj-vdso32 = sigtramp.o gettimeofday.o datapage.o cacheflush.o note.o getcpu.o
 
-ifneq ($(c-gettimeofday-y),)
-  CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
-  CFLAGS_vgettimeofday.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
-  CFLAGS_vgettimeofday.o += $(call cc-option, -fno-stack-protector)
-  CFLAGS_vgettimeofday.o += -DDISABLE_BRANCH_PROFILING
-  CFLAGS_vgettimeofday.o += -ffreestanding -fasynchronous-unwind-tables
-  CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
-endif
+CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
+CFLAGS_vgettimeofday.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
+CFLAGS_vgettimeofday.o += $(call cc-option, -fno-stack-protector)
+CFLAGS_vgettimeofday.o += -DDISABLE_BRANCH_PROFILING
+CFLAGS_vgettimeofday.o += -ffreestanding -fasynchronous-unwind-tables
+CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
 
 # Build rules
 
diff --git a/arch/powerpc/kernel/vdso64/Makefile b/arch/powerpc/kernel/vdso64/Makefile
index 2813e3f98db6..cdf748ebdcde 100644
--- a/arch/powerpc/kernel/vdso64/Makefile
+++ b/arch/powerpc/kernel/vdso64/Makefile
@@ -6,14 +6,12 @@ include $(srctree)/lib/vdso/Makefile
 
 obj-vdso64 = sigtramp.o gettimeofday.o datapage.o cacheflush.o note.o getcpu.o
 
-ifneq ($(c-gettimeofday-y),)
-  CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
-  CFLAGS_vgettimeofday.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
-  CFLAGS_vgettimeofday.o += $(call cc-option, -fno-stack-protector)
-  CFLAGS_vgettimeofday.o += -DDISABLE_BRANCH_PROFILING
-  CFLAGS_vgettimeofday.o += -ffreestanding -fasynchronous-unwind-tables
-  CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
-endif
+CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
+CFLAGS_vgettimeofday.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
+CFLAGS_vgettimeofday.o += $(call cc-option, -fno-stack-protector)
+CFLAGS_vgettimeofday.o += -DDISABLE_BRANCH_PROFILING
+CFLAGS_vgettimeofday.o += -ffreestanding -fasynchronous-unwind-tables
+CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
 
 # Build rules
 
diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
index 24d936c147cd..7653767a6100 100644
--- a/arch/riscv/kernel/vdso/Makefile
+++ b/arch/riscv/kernel/vdso/Makefile
@@ -17,10 +17,7 @@ vdso-syms += flush_icache
 obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o
 
 ccflags-y := -fno-stack-protector
-
-ifneq ($(c-gettimeofday-y),)
-  CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y)
-endif
+CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y)
 
 # Build rules
 targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-syms.S
-- 
2.27.0


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH] arch: vdso: remove if-conditionals of $(c-gettimeofday-y)
  2021-07-31  5:57 [PATCH] arch: vdso: remove if-conditionals of $(c-gettimeofday-y) Masahiro Yamada
@ 2021-08-25  3:49 ` Palmer Dabbelt
  0 siblings, 0 replies; 2+ messages in thread
From: Palmer Dabbelt @ 2021-08-25  3:49 UTC (permalink / raw)
  To: masahiroy
  Cc: luto, tglx, vincenzo.frascino, linux-kernel, masahiroy, will,
	tsbogend, mpe, catalin.marinas, benh, linux-mips, paulus,
	linux-riscv, aou, linuxppc-dev, linux, linux-arm-kernel,
	Paul Walmsley

On Fri, 30 Jul 2021 22:57:33 PDT (-0700), masahiroy@kernel.org wrote:
> arm, arm64, mips, powerpc always select GENERIC_GETTIMEOFDAY, hence
> $(gettimeofday-y) never becomes empty.
>
> riscv conditionally selects GENERIC_GETTIMEOFDAY when MMU=y && 64BIT=y,
> but arch/riscv/kernel/vdso/vgettimeofday.o is built only under that
> condition. So, you can always define CFLAGS_vgettimeofday.o
>
> Remove all the meaningless conditionals.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---
>
>  arch/riscv/kernel/vdso/Makefile     |  5 +----

Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2021-07-31  5:57 [PATCH] arch: vdso: remove if-conditionals of $(c-gettimeofday-y) Masahiro Yamada
2021-08-25  3:49 ` Palmer Dabbelt

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