linux-kernel - Re: [PATCH] selftests: kvm: Fix a compile error in selftests/kvm/rseq

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Date:   Wed, 21 Sep 2022 16:29:42 -0700
From:   David Matlack <dmatlack@...gle.com>
To:     JinrongLiang <ljr.kernel@...il.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Liam Merwick <liam.merwick@...cle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Jinrong Liang <cloudliang@...cent.com>,
        kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] selftests: kvm: Fix a compile error in selftests/kvm/rseq_test.c

On Fri, Sep 16, 2022 at 3:03 AM JinrongLiang <ljr.kernel@...il.com> wrote:
>
>
>
> On 2022/9/8 00:54, Liam Merwick wrote:
> > On 07/09/2022 17:01, Sean Christopherson wrote:
> >> On Tue, Aug 02, 2022, Jinrong Liang wrote:
> >>> From: Jinrong Liang <cloudliang@...cent.com>
> >>>
> >>> The following warning appears when executing:
> >>>     make -C tools/testing/selftests/kvm
> >>>
> >>> rseq_test.c: In function ‘main’:
> >>> rseq_test.c:237:33: warning: implicit declaration of function
> >>> ‘gettid’; did you mean ‘getgid’? [-Wimplicit-function-declaration]
> >>>            (void *)(unsigned long)gettid());
> >>>                                   ^~~~~~
> >>>                                   getgid
> >>> /usr/bin/ld: /tmp/ccr5mMko.o: in function `main':
> >>> ../kvm/tools/testing/selftests/kvm/rseq_test.c:237: undefined
> >>> reference to `gettid'
> >>> collect2: error: ld returned 1 exit status
> >>> make: *** [../lib.mk:173:
> >>> ../kvm/tools/testing/selftests/kvm/rseq_test] Error 1
> >>>
> >>> Use the more compatible syscall(SYS_gettid) instead of gettid() to
> >>> fix it.
> >>> More subsequent reuse may cause it to be wrapped in a lib file.
> >>>
> >>> Signed-off-by: Jinrong Liang <cloudliang@...cent.com>
> >>> ---
> >>
> >> Reviewed-by: Sean Christopherson <seanjc@...gle.com>
> >>
> >
> > Can a 'Cc: stable@...r.kernel.org' be added also as e923b0537d28 got
> > backported to v5.15.58
> >
> > Reviewed-by: Liam Merwick <liam.merwick@...cle.com>
> >
> >
> >>
> >> Paolo, do you want to grab this for 6.0?  It doesn't look like we're
> >> going to have
> >> a more elegant solution anytime soon...
> >
> Ping?

+1, please grab this. Every new branch I create (for new development
and to review upstream code) I have to remember to cherry-pick this
patch in because I use Clang.