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: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Ingo Molnar <mingo@kernel.org> Acked-by: Michael 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
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@ -228,10 +228,6 @@ KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
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KBUILD_CFLAGS += $(call cc-option,-mno-spe)
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KBUILD_CFLAGS += $(call cc-option,-mspe=no)
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# Enable unit-at-a-time mode when possible. It shrinks the
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# kernel considerably.
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KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
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# FIXME: the module load should be taught about the additional relocs
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# generated by this.
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# revert to pre-gcc-4.4 behaviour of .eh_frame
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@ -130,10 +130,6 @@ else
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KBUILD_CFLAGS += -mno-red-zone
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KBUILD_CFLAGS += -mcmodel=kernel
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# -funit-at-a-time shrinks the kernel .text considerably
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# unfortunately it makes reading oopses harder.
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KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
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endif
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ifdef CONFIG_X86_X32
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@ -26,9 +26,6 @@ cflags-y += $(call cc-option,-mpreferred-stack-boundary=2)
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# an unresolved reference.
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cflags-y += -ffreestanding
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# gcc 4.3.0 needs -funit-at-a-time for extern inline functions.
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KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
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KBUILD_CFLAGS += $(cflags-y)
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else
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@ -50,6 +47,4 @@ ELF_FORMAT := elf64-x86-64
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LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib64
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LINK-y += -m64
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# Do unit-at-a-time unconditionally on x86_64, following the host
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KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
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endif
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