linux-kernel - Re: [PATCH] kvm: x86: mmu: Add cast to negated bitmasks in update_permission

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Date:   Wed, 20 Jun 2018 10:02:15 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Matthias Kaehlcke <mka@...omium.org>, Joe Perches <joe@...ches.com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>, rkrcmar@...hat.com,
        Thomas Gleixner <tglx@...utronix.de>, hpa@...or.com,
        x86@...nel.org, kvm@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: Re: [PATCH] kvm: x86: mmu: Add cast to negated bitmasks in
 update_permission_bitmask()

On 20/06/2018 01:45, Matthias Kaehlcke wrote:
> 
> v4.16 with an x86 allyesconfig and a few drivers disabled since they
> don't build with clang (yet):
> 
> 16 occurrences of -Wconstant-conversion, including the ones fixed by
> this patch. Certainly no need for an endless churn of patches, and
> given the limited number it also doesn't seem likely that new
> instances will be added on a regular base.

Thanks for providing numbers!  The next question is: how many of these
16 occurrences are actual bugs?  This is what measures the usefulness of
the warning.

Paolo