linux-kernel - Re: [PATCH v2] arm64: Restrict ARM64_BTI

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Message-Id: <162619029187.3095121.267075671742631551.b4-ty@kernel.org>
Date:   Tue, 13 Jul 2021 19:08:56 +0100
From:   Will Deacon <will@...nel.org>
To:     Nathan Chancellor <nathan@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>,
        clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] arm64: Restrict ARM64_BTI_KERNEL to clang 12.0.0 and newer

On Mon, 12 Jul 2021 14:46:37 -0700, Nathan Chancellor wrote:
> Commit 97fed779f2a6 ("arm64: bti: Provide Kconfig for kernel mode BTI")
> disabled CONFIG_ARM64_BTI_KERNEL when CONFIG_GCOV_KERNEL was enabled and
> compiling with clang because of warnings that were seen with
> allmodconfig because LLVM was not emitting PAC/BTI instructions for
> compiler generated functions:
> 
> warning: some functions compiled with BTI and some compiled without BTI
> warning: not setting BTI in feature flags
> 
> [...]

Thanks Nathan for turning this around so quickly. The new commit message
is much better.

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64: Restrict ARM64_BTI_KERNEL to clang 12.0.0 and newer
      https://git.kernel.org/arm64/c/8cdd23c23c3d

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev