linux-kernel - Re: [PATCH 1/5] KVM: change API for requests to match bit operations

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Date:   Fri, 17 Feb 2017 10:52:53 +0100
From:   Cornelia Huck <cornelia.huck@...ibm.com>
To:     Andrew Jones <drjones@...hat.com>
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        James Hogan <james.hogan@...tec.com>,
        Paul Mackerras <paulus@...abs.org>,
        Christoffer Dall <christoffer.dall@...aro.org>
Subject: Re: [PATCH 1/5] KVM: change API for requests to match bit
 operations

On Fri, 17 Feb 2017 10:49:35 +0100
Andrew Jones <drjones@...hat.com> wrote:

> On Fri, Feb 17, 2017 at 10:30:14AM +0100, Cornelia Huck wrote:
> > On Thu, 16 Feb 2017 17:04:45 +0100
> > Radim Krčmář <rkrcmar@...hat.com> wrote:
> > > +static inline void kvm_request_set(unsigned req, struct kvm_vcpu *vcpu)
> > 
> > Should we make req unsigned long as well, so that it matches the bit
> > api even more?
> 
> The bitops API is inconsistent among architectures; some are int, some
> are unsigned int, some are unsigned long, and x86 is long. If we want
> to be consistent with something, then, IMO, we should be consistent with
> asm-generic/bitops, which is int, but actually unsigned makes more sense
> to me...

Inconsistent interfaces are great :/

Having (any) unsigned value makes the most sense to me as well.