linux-kernel - Re: [PATCH v3] arm64: vdso32: drop -no-integrated-as flag

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Message-ID: <161894584244.46595.3366888884991252865@swboyd.mtv.corp.google.com>
Date:   Tue, 20 Apr 2021 12:10:42 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Will Deacon <will@...nel.org>
Cc:     vincenzo.frascino@....com,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH v3] arm64: vdso32: drop -no-integrated-as flag

Quoting Nick Desaulniers (2021-04-20 10:44:25)
> Clang can assemble these files just fine; this is a relic from the top
> level Makefile conditionally adding this. We no longer need --prefix,
> --gcc-toolchain, or -Qunused-arguments flags either with this change, so
> remove those too.
> 
> To test building:
> $ ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- \
>   CROSS_COMPILE_COMPAT=arm-linux-gnueabi- make LLVM=1 LLVM_IAS=1 \
>   defconfig arch/arm64/kernel/vdso32/
> 
> Suggested-by: Nathan Chancellor <nathan@...nel.org>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Reviewed-by: Nathan Chancellor <nathan@...nel.org>
> Reviewed-by: Vincenzo Frascino <vincenzo.frascino@....com>
> ---

It boots for me and compat vDSO seems to work properly per
tools/testing/selftests/vDSO/, userspace programs aren't crashing right
and left, must be good:

Tested-by: Stephen Boyd <swboyd@...omium.org>