linux-kernel - Re: [PATCH] KVM: x86: fix cocci warnings

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Message-ID: <20211115204905.GQ174703@worktop.programming.kicks-ass.net>
Date:   Mon, 15 Nov 2021 21:49:05 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Vihas Mak <makvihas@...il.com>, seanjc@...gle.com,
        vkuznets@...hat.com, wanpengli@...cent.com, jmattson@...gle.com,
        joro@...tes.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: fix cocci warnings

On Mon, Nov 15, 2021 at 06:06:08PM +0100, Paolo Bonzini wrote:
> On 11/15/21 12:43, Peter Zijlstra wrote:
> > On Sun, Nov 14, 2021 at 10:13:12PM +0530, Vihas Mak wrote:
> > > change 0 to false and 1 to true to fix following cocci warnings:
> > > 
> > >          arch/x86/kvm/mmu/mmu.c:1485:9-10: WARNING: return of 0/1 in function 'kvm_set_pte_rmapp' with return type bool
> > >          arch/x86/kvm/mmu/mmu.c:1636:10-11: WARNING: return of 0/1 in function 'kvm_test_age_rmapp' with return type bool
> > 
> > That script should be deleted, it's absolute garbage.
> > 
> 
> Only a Sith deals in absolutes.

Is that a star-wars thingy?

In C 0 is a valid way to spell false, equally, any non-0 value is a
valid way to spell true. Why would this rate a warn?

In fact, when casting _Bool to integer, you get 0 and 1. When looking at
the memory content of the _Bool variable, you'll get 0 and 1. But we're
not allowed to write 0 and 1?