kvm.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Paolo Bonzini <pbonzini@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Vihas Mak <makvihas@gmail.com>,
	seanjc@google.com, vkuznets@redhat.com, wanpengli@tencent.com,
	jmattson@google.com, joro@8bytes.org, tglx@linutronix.de,
	mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
	x86@kernel.org, hpa@zytor.com, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] KVM: x86: fix cocci warnings
Date: Tue, 16 Nov 2021 08:38:34 +0100	[thread overview]
Message-ID: <ce66f713-3d5f-cf3f-8813-d25ee1d2cec7@redhat.com> (raw)
In-Reply-To: <20211115204905.GQ174703@worktop.programming.kicks-ass.net>

On 11/15/21 21:49, Peter Zijlstra wrote:
> 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?

Yes, it is.  "If you're not with me, then you're my enemy!" "Only a Sith 
deals in absolutes". :)

> 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?

Because often 0 means success (if -errno means failure).  So if you 
write false/true consistently for bool and 0 only for int, it's one less 
thing that one can get wrong.  At least that's the rationale.

Paolo

> 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?
> 


      reply	other threads:[~2021-11-16  7:38 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-14 16:43 [PATCH] KVM: x86: fix cocci warnings Vihas Mak
2021-11-15  9:59 ` Vitaly Kuznetsov
2021-11-15 11:33   ` Vihas Mak
2021-11-16  9:50   ` Paolo Bonzini
2021-11-16 18:16     ` Nick Desaulniers
2021-11-15 11:43 ` Peter Zijlstra
2021-11-15 17:06   ` Paolo Bonzini
2021-11-15 20:49     ` Peter Zijlstra
2021-11-16  7:38       ` Paolo Bonzini [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=ce66f713-3d5f-cf3f-8813-d25ee1d2cec7@redhat.com \
    --to=pbonzini@redhat.com \
    --cc=bp@alien8.de \
    --cc=dave.hansen@linux.intel.com \
    --cc=hpa@zytor.com \
    --cc=jmattson@google.com \
    --cc=joro@8bytes.org \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=makvihas@gmail.com \
    --cc=mingo@redhat.com \
    --cc=peterz@infradead.org \
    --cc=seanjc@google.com \
    --cc=tglx@linutronix.de \
    --cc=vkuznets@redhat.com \
    --cc=wanpengli@tencent.com \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).