[PATCH v2] powerpc/build: Remove -pipe from compilation flags

[PATCH v2] powerpc/build: Remove -pipe from compilation flags

[Nicholas Piggin]

x86 removed -pipe in commit 437e88ab8f9e2 ("x86/build: Remove -pipe from
KBUILD_CFLAGS") and the newer arm64 and riscv seem to have never used it,
so that seems to be the way the world's going.

Compile performance building defconfig on a POWER10 PowerNV system
was in the noise after 10 builds each. No point in adding options unless
they help something, so remove it.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
This applies after the boot flags series, but easy enough to rebase if
necessary.

Thanks,
Nick

 arch/powerpc/Makefile      | 2 +-
 arch/powerpc/boot/Makefile | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index dca73f673d70..76fc7cc26780 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -166,7 +166,7 @@ asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
 KBUILD_CPPFLAGS	+= -I $(srctree)/arch/$(ARCH) $(asinstr)
 KBUILD_AFLAGS	+= $(AFLAGS-y)
 KBUILD_CFLAGS	+= $(call cc-option,-msoft-float)
-KBUILD_CFLAGS	+= -pipe $(CFLAGS-y)
+KBUILD_CFLAGS	+= $(CFLAGS-y)
 CPP		= $(CC) -E $(KBUILD_CFLAGS)
 
 CHECKFLAGS	+= -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 6f9ef031bfc7..bf8976563e02 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -71,7 +71,7 @@ endif
 BOOTCPPFLAGS	:= -nostdinc $(LINUXINCLUDE)
 BOOTCPPFLAGS	+= -isystem $(shell $(BOOTCC) -print-file-name=include)
 
-BOOTCFLAGS	:= -pipe $(BOOTTARGETFLAGS) \
+BOOTCFLAGS	:= $(BOOTTARGETFLAGS) \
 		   -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 		   -fno-strict-aliasing -O2 \
 		   -msoft-float -mno-altivec -mno-vsx \
@@ -81,7 +81,7 @@ BOOTCFLAGS	:= -pipe $(BOOTTARGETFLAGS) \
 		   $(call cc-option,-mno-spe) $(call cc-option,-mspe=no) \
 		   -fomit-frame-pointer -fno-builtin -fPIC
 
-BOOTAFLAGS	:= -pipe $(BOOTTARGETFLAGS) -D__ASSEMBLY__
+BOOTAFLAGS	:= $(BOOTTARGETFLAGS) -D__ASSEMBLY__
 
 BOOTARFLAGS	:= -crD
 
-- 
2.40.1

Re: [PATCH v2] powerpc/build: Remove -pipe from compilation flags

[Michael Ellerman]

On Tue, 06 Jun 2023 16:48:30 +1000, Nicholas Piggin wrote:
> x86 removed -pipe in commit 437e88ab8f9e2 ("x86/build: Remove -pipe from
> KBUILD_CFLAGS") and the newer arm64 and riscv seem to have never used it,
> so that seems to be the way the world's going.
> 
> Compile performance building defconfig on a POWER10 PowerNV system
> was in the noise after 10 builds each. No point in adding options unless
> they help something, so remove it.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/build: Remove -pipe from compilation flags
      https://git.kernel.org/powerpc/c/f5df87b855fd835ff0f4928575adbf4f5302bb40

cheers