linux-kernel - Re: [PATCH -next] KVM: x86: remove set but not used variable 'called'

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Date:   Fri, 22 Nov 2019 06:58:51 -0500
From:   Nitesh Narayan Lal <nitesh@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Mao Wenan <maowenan@...wei.com>, pbonzini@...hat.com,
        rkrcmar@...hat.com, sean.j.christopherson@...el.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH -next] KVM: x86: remove set but not used variable 'called'


On 11/19/19 8:25 AM, Vitaly Kuznetsov wrote:
> Dan Carpenter <dan.carpenter@...cle.com> writes:
>
>> On Tue, Nov 19, 2019 at 01:28:32PM +0100, Vitaly Kuznetsov wrote:
>>> Dan Carpenter <dan.carpenter@...cle.com> writes:
>>>
>>>> On Tue, Nov 19, 2019 at 12:58:54PM +0100, Vitaly Kuznetsov wrote:
>>>>> Mao Wenan <maowenan@...wei.com> writes:
>>>>>
>>>>>> Fixes gcc '-Wunused-but-set-variable' warning:
>>>>>>
>>>>>> arch/x86/kvm/x86.c: In function kvm_make_scan_ioapic_request_mask:
>>>>>> arch/x86/kvm/x86.c:7911:7: warning: variable called set but not
>>>>>> used [-Wunused-but-set-variable]
>>>>>>
>>>>>> It is not used since commit 7ee30bc132c6 ("KVM: x86: deliver KVM
>>>>>> IOAPIC scan request to target vCPUs")
>>>>> Better expressed as 
>>>>>
>>>>> Fixes: 7ee30bc132c6 ("KVM: x86: deliver KVM IOAPIC scan request to target vCPUs")
>>>>>
>>>> There is sort of a debate about this whether the Fixes tag should be
>>>> used if it's only a cleanup.
>>>>
>>> I have to admit I'm involved in doing backporting sometimes and I really
>>> appreciate Fixes: tags. Just so you know on which side of the debate I
>>> am :-)
>> But we're not going to backport this hopefully?
>>
> In case we're speaking about stable@ kernels, 7ee30bc132c6 doesn't look
> like a good candidate (to me) but who knows, it may get pulled in
> because of some code dependency or some other 'autosel magic'. And
> that's when 'Fixes:' tags become handy.

Anything I can improve upon? If required I can send fixes on top of it.
For the build error, I didn't trigger it because I didn't compile with
appropriate flags.
I will make a note for myself for next time.

Thanks, Mao for sending the fix.

>
-- 
Nitesh



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