linux-kernel - Re: Clang patches for 4.9

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Date:   Mon, 25 Feb 2019 15:55:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Sasha Levin <sashal@...nel.org>, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: Clang patches for 4.9

On Sun, Feb 24, 2019 at 11:13:01PM -0700, Nathan Chancellor wrote:
> 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].

I've included most of these now, except for the ones already pointed
out.

> 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.

Thanks for the merge resolution, I am guessing it is not going to be the
same now that I did not take all of your Makefile patches :)

greg k-h