LLD patches for x86_64

From: Nathan Chancellor <natechancellor@gmail.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Sasha Levin <sashal@kernel.org>
Cc: stable@vger.kernel.org, Alistair Strachan <astrachan@google.com>,
	Sami Tolvanen <samitolvanen@google.com>,
	Nick Desaulniers <ndesaulniers@google.com>
Subject: LLD patches for x86_64
Date: Wed, 10 Apr 2019 20:51:43 -0700	[thread overview]
Message-ID: <20190411035143.GA14196@archlinux-i9> (raw)

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Hi Greg and Sasha,

Please apply the following mbox files to their respective trees. They
contain upstream patches that allow a tip of tree LLD to link an x86
kernel image as well as a patch to avoid using $(LD) to check for
the location of binutils, which won't always be accurate when linking
with LLD. This was tested with both the upstream defconfig and Android's
x86_64_cuttlefish_defconfig in their respective trees (building/linking
with both Clang/LLD and GCC/ld.bfd then booting in QEMU).

For 5.0, a simple cherry-pick of commit ad15006cc784 ("kbuild: clang:
choose GCC_TOOLCHAIN_DIR not on LD") will do.

Greg, the merge into kernel/common will result in two conflicts:

* Makefile:
    Make the diff match upstream commit
        ad15006cc784 ("kbuild: clang: choose GCC_TOOLCHAIN_DIR not on LD")

* arch/x86/entry/vdso/Makefile:
    Take the right hand side, effectively replacing common commit
        35b779802c2e ("x86: vdso: Fix leaky vdso linker with CC=clang.")
    with the proper upstream commit
        379d98ddf413 ("x86: vdso: Use $LD instead of $CC to link")

Also, while you are at it, would you mind picking up upstream commit
5f074f3e192f ("lib/string.c: implement a basic bcmp")? It is cc'd for
stable but it's worth mentioning now so we can stop carrying it out of
tree :)

Let me know if there are any issues, comments, or concerns,
Nathan

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