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

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Message-ID: <YxjAZOGF9uSE2+AT@google.com>
Date:   Wed, 7 Sep 2022 16:01:40 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Jinrong Liang <ljr.kernel@...il.com>
Cc:     Paolo Bonzini <pbonzini@...hat.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@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests: kvm: Fix a compile error in
 selftests/kvm/rseq_test.c

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>


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...