Commit 63fea0af authored by Masahiro Yamada's avatar Masahiro Yamada Committed by Borislav Petkov
Browse files

x86, powerpc: Remove -funit-at-a-time compiler option entirely 



GCC 4.6 manual says:

  -funit-at-a-time
    This option is left for compatibility reasons. -funit-at-a-time has
    no effect, while -fno-unit-at-a-time implies -fno-toplevel-reorder
    and -fno-section-anchors. Enabled by default.

Remove it.

Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Acked-by: default avatarIngo Molnar <mingo@kernel.org>
Acked-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Richard Weinberger <richard@sigma-star.at>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/1541990120-9643-3-git-send-email-yamada.masahiro@socionext.com
parent 829889ac

arch/powerpc/Makefile

+0 −4
Original line number Diff line number Diff line
@@ -228,10 +228,6 @@ KBUILD_CFLAGS += $(call cc-option,-mno-vsx) 
KBUILD_CFLAGS += $(call cc-option,-mno-spe)

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

# generated by this.

# revert to pre-gcc-4.4 behaviour of .eh_frame

arch/x86/Makefile

+0 −4
Original line number Diff line number Diff line
@@ -130,10 +130,6 @@ else 


        KBUILD_CFLAGS += -mno-red-zone

        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



ifdef CONFIG_X86_X32

arch/x86/Makefile.um

+0 −5
Original line number Diff line number Diff line
@@ -26,9 +26,6 @@ cflags-y += $(call cc-option,-mpreferred-stack-boundary=2) 
# an unresolved reference.

cflags-y += -ffreestanding



# gcc 4.3.0 needs -funit-at-a-time for extern inline functions.

KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)



KBUILD_CFLAGS += $(cflags-y)



else
@@ -50,6 +47,4 @@ ELF_FORMAT := elf64-x86-64 
LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib64

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

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