linux-kernel - Re: [PATCH 15/24] kvm: mmu: Wrap mmu_lock cond

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Message-ID: <4c0d4c30-a95b-7954-d344-fb991270f79a@redhat.com>
Date:   Wed, 27 Jan 2021 21:55:10 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Ben Gardon <bgardon@...gle.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>,
        Peter Xu <peterx@...hat.com>, Peter Shier <pshier@...gle.com>,
        Peter Feiner <pfeiner@...gle.com>,
        Junaid Shahid <junaids@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Yulei Zhang <yulei.kernel@...il.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>
Subject: Re: [PATCH 15/24] kvm: mmu: Wrap mmu_lock cond_resched and needbreak

On 27/01/21 21:08, Ben Gardon wrote:
> I'm not entirely sure I understand this suggestion. Are you suggesting
> we'd have the spinlock and rwlock in a union in struct kvm but then
> use a static define to choose which one is used by other functions? It
> seems like if we're using static defines the union doesn't add value.

Of course you're right.  You'd just place the #ifdef in the struct kvm 
definition.

You can place static inline functions for lock/unlock in 
virt/kvm/mmu_lock.h, in order to avoid a proliferation of #ifdefs.

Paolo