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    Subject[PATCH 4.9 44/92] arm64: remove no-op -p linker flag
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    (commit 1a381d4a0a9a0f999a13faaba22bf6b3fc80dcb9 upstream)

    Linking the ARM64 defconfig kernel with LLVM lld fails with the error:

    ld.lld: error: unknown argument: -p
    Makefile:1015: recipe for target 'vmlinux' failed

    Without this flag, the ARM64 defconfig kernel successfully links with
    lld and boots on Dragonboard 410c.

    After digging through binutils source and changelogs, it turns out that
    -p is only relevant to ancient binutils installations targeting 32-bit
    ARM. binutils accepts -p for AArch64 too, but it's always been
    undocumented and silently ignored. A comment in
    ld/emultempl/aarch64elf.em explains that it's "Only here for backwards
    compatibility".

    Since this flag is a no-op on ARM64, we can safely drop it.

    Acked-by: Will Deacon <will.deacon@arm.com>
    Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
    Signed-off-by: Greg Hackmann <ghackmann@google.com>
    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/arm64/Makefile | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
    index 92110c2c6c59..ee94597773fa 100644
    --- a/arch/arm64/Makefile
    +++ b/arch/arm64/Makefile
    @@ -10,7 +10,7 @@
    #
    # Copyright (C) 1995-2001 by Russell King

    -LDFLAGS_vmlinux :=-p --no-undefined -X
    +LDFLAGS_vmlinux :=--no-undefined -X
    CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
    GZFLAGS :=-9

    --
    2.17.1


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