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Merge branch 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 build updates from Ingo Molnar:

 - Resolve LLVM build bug by removing redundant GNU specific flag

 - Remove obsolete -funit-at-a-time and -fno-unit-at-a-time use from x86
   PowerPC and UM.

   The UML change was seen and acked by UML maintainer Richard
   Weinberger.

* 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/um/vdso: Drop implicit common-page-size linker flag
  x86, powerpc: Remove -funit-at-a-time compiler option entirely
  x86/um: Remove -fno-unit-at-a-time workaround for pre-4.0 GCC
This commit is contained in:
Linus Torvalds 2018-12-26 16:57:27 -08:00
parent 9a126e788a e4f752dda0
commit 6e54df001a
4 changed files with 1 additions and 18 deletions
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4
arch/powerpc/Makefile
View File

@ -228,10 +228,6 @@ KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
KBUILD_CFLAGS += $(call cc-option,-mno-spe) KBUILD_CFLAGS += $(call cc-option,-mno-spe)
KBUILD_CFLAGS += $(call cc-option,-mspe=no) KBUILD_CFLAGS += $(call cc-option,-mspe=no)
# Enable unit-at-a-time mode when possible. It shrinks the
# kernel considerably.
KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
# FIXME: the module load should be taught about the additional relocs # FIXME: the module load should be taught about the additional relocs
# generated by this. # generated by this.
# revert to pre-gcc-4.4 behaviour of .eh_frame # revert to pre-gcc-4.4 behaviour of .eh_frame

4
arch/x86/Makefile
View File

@ -130,10 +130,6 @@ else
KBUILD_CFLAGS += -mno-red-zone KBUILD_CFLAGS += -mno-red-zone
KBUILD_CFLAGS += -mcmodel=kernel KBUILD_CFLAGS += -mcmodel=kernel
# -funit-at-a-time shrinks the kernel .text considerably
# unfortunately it makes reading oopses harder.
KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
endif endif
ifdef CONFIG_X86_X32 ifdef CONFIG_X86_X32

9
arch/x86/Makefile.um
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@ -26,13 +26,6 @@ cflags-y += $(call cc-option,-mpreferred-stack-boundary=2)
# an unresolved reference. # an unresolved reference.
cflags-y += -ffreestanding cflags-y += -ffreestanding
# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
# a lot more stack due to the lack of sharing of stacklots. Also, gcc
# 4.3.0 needs -funit-at-a-time for extern inline functions.
KBUILD_CFLAGS += $(shell if [ $(cc-version) -lt 0400 ] ; then \
echo $(call cc-option,-fno-unit-at-a-time); \
else echo $(call cc-option,-funit-at-a-time); fi ;)
KBUILD_CFLAGS += $(cflags-y) KBUILD_CFLAGS += $(cflags-y)
else else
@ -54,6 +47,4 @@ ELF_FORMAT := elf64-x86-64
LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib64 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib64
LINK-y += -m64 LINK-y += -m64
# Do unit-at-a-time unconditionally on x86_64, following the host
KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
endif endif

2
arch/x86/um/vdso/Makefile
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@ -26,7 +26,7 @@ targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y)
CPPFLAGS_vdso.lds += -P -C CPPFLAGS_vdso.lds += -P -C
VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \ VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
-Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 -Wl,-z,max-page-size=4096
$(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so $(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so