linux-kernel - Re: [PATCH v3 08/15] arm64: kvm: Split hyp/switch.c to VHE/nVHE

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Date:   Thu, 25 Jun 2020 09:16:03 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     David Brazdil <dbrazdil@...gle.com>, Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, android-kvm@...gle.com
Subject: Re: [PATCH v3 08/15] arm64: kvm: Split hyp/switch.c to VHE/nVHE

On 2020-06-25 06:03, kernel test robot wrote:
> Hi David,
> 
> Thank you for the patch! Perhaps something to improve:
> 
> [auto build test WARNING on linus/master]
> [also build test WARNING on v5.8-rc2 next-20200624]
> [cannot apply to kvmarm/next arm64/for-next/core 
> arm-perf/for-next/perf]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use  as documented in
> https://git-scm.com/docs/git-format-patch]
> 
> url:
> https://github.com/0day-ci/linux/commits/David-Brazdil/Split-off-nVHE-hyp-code/20200618-203230
> base:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> 1b5044021070efa3259f3e9548dc35d1eb6aa844
> config: arm64-randconfig-r021-20200624 (attached as .config)
> compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project
> 8911a35180c6777188fefe0954a2451a2b91deaf)
> reproduce (this is a W=1 build):
>         wget
> https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross
> -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install arm64 cross compiling tool for clang build
>         # apt-get install binutils-aarch64-linux-gnu
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 
> ARCH=arm64
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
>>> arch/arm64/kvm/hyp/nvhe/switch.c:244:28: warning: no previous 
>>> prototype for function 'hyp_panic' [-Wmissing-prototypes]
>    void __hyp_text __noreturn hyp_panic(struct kvm_cpu_context 
> *host_ctxt)

I really wish we could turn these warnings off. They don't add much.
Or is there an annotation we could stick on the function (something
like __called_from_asm_please_leave_me_alone springs to mind...)?

         M.
-- 
Jazz is not dead. It just smells funny...