linux-kernel - Clang patches for 4.9

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Date:   Sun, 24 Feb 2019 23:13:01 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Clang patches for 4.9

Hi Greg and Sasha,

Attached are three mbox files containing patches that bring the Clang
backports that Nick did in 4.9.139 up to date with what is currently in
4.14 and mainline, as well as fix warnings that are present in the arm64
and x86_64 defconfigs here and in AOSP (cuttlefish_defconfig). All of
these warnings are fixed in 4.14 so there will be no regressions from
upgrading.

They were tested with Arch Linux's GCC 8.2.1 and AOSP's clang-r349610 [1]
and boot tested in QEMU 3.1.0 with our rootfs files [2].

Additionally, for Greg, I have provided a merge resolution for
the Makefile conflict you will get when doing the android-4.9 merge.
You will also get a conflict in arch/arm64/include/asm/arch_gicv3.h,
just check out to MERGE_HEAD as the {read,write}_sysreg_s macros have
the LTO workaround that causes the conflict in the first place. I
tested this resolution by building and booting cuttlefish_defconfig
for arm64 with CONFIG_LTO_CLANG and CONFIG_CFI_CLANG enabled.

[1]: https://android.googlesource.com/platform/prebuilts/clang/host/linux-x86/+/803bf398de492bb70560a2444d24491bc42b84ec/clang-r349610/
[2]: https://github.com/ClangBuiltLinux/continuous-integration/tree/8a288264aa71f59a1725d2946b0a40364aafcad7/images

Please let me know if there are any concerns or objections!
Nathan

Download attachment "core-clang-fixes-4.9.mbox" of type "application/mbox" (14283 bytes)

Download attachment "arm64-clang-warning-fixes-4.9.mbox" of type "application/mbox" (15433 bytes)

Download attachment "x86_64-clang-warning-fixes-4.9.mbox" of type "application/mbox" (20377 bytes)

View attachment "android-4.9-Makefile.diff" of type "text/plain" (4099 bytes)