linux-kernel - Re: [PATCH v4 3/3] x86/kvm: Expose AMD Core Perf Extension flag to guests

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Date:   Sat, 3 Feb 2018 04:03:02 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Janakarajan Natarajan <Janakarajan.Natarajan@....com>
Cc:     kbuild-all@...org, kvm@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krcmar <rkrcmar@...hat.com>,
        Len Brown <len.brown@...el.com>, Kyle Huey <me@...ehuey.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Borislav Petkov <bp@...e.de>,
        Grzegorz Andrejczuk <grzegorz.andrejczuk@...el.com>,
        Kan Liang <Kan.liang@...el.com>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>
Subject: Re: [PATCH v4 3/3] x86/kvm: Expose AMD Core Perf Extension flag to
 guests

Hi Janakarajan,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/x86/core]
[also build test WARNING on v4.15]
[cannot apply to kvm/linux-next next-20180202]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Janakarajan-Natarajan/Support-Perf-Extensions-on-AMD-KVM-guests/20180202-231344
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> arch/x86/kvm/cpuid.c:58:6: sparse: symbol 'perf_ext_supported' was not declared. Should it be

Please review and possibly fold the followup patch.

---
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