From: "Radim Krčmář" <rkrcmar@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
Nadav Amit <namit@cs.technion.ac.il>,
Gleb Natapov <gleb@kernel.org>
Subject: Re: [PATCH 2/8] KVM: x86: cleanup kvm_apic_match_*()
Date: Mon, 2 Feb 2015 15:30:54 +0100 [thread overview]
Message-ID: <20150202143054.GC19731@potion.redhat.com> (raw)
In-Reply-To: <54CF8993.7060901@redhat.com>
2015-02-02 15:28+0100, Paolo Bonzini:
>
>
> On 02/02/2015 15:26, Radim Krčmář wrote:
> >>> > > + return ((logical_id >> 4) == (mda >> 4))
> >>> > > + && (logical_id & mda & 0xf);
> > was merged as
> >
> > + return ((logical_id >> 4) == (mda >> 4))
> > + && (logical_id & mda & 0xf) != 0;
> >
> > but it has to be parenthesized ('&&' has lower precedence than '!=').
>
> Lower precedence means that the merged version is right (unless my brain
> went bonkers, which I cannot exclude). "!=" has higher precedence and
> thus it is implicitly parenthesized.
>
> In fact the first comparison could have its parentheses removed as well.
Yes, it could be,
logical_id >> 4 == mda >> 4 && (logical_id & mda & 0xf) != 0
I missed the point and thought that you wanted to turn the whole
expression into bool, when it already was one.
next prev parent reply other threads:[~2015-02-02 14:30 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-29 21:48 [PATCH 0/8] KVM: minor APIC fixes and cleanups Radim Krčmář
2015-01-29 21:48 ` [PATCH 1/8] KVM: x86: return bool from kvm_apic_match*() Radim Krčmář
2015-01-29 22:10 ` Joe Perches
2015-01-30 8:50 ` Paolo Bonzini
2015-01-29 21:48 ` [PATCH 2/8] KVM: x86: cleanup kvm_apic_match_*() Radim Krčmář
2015-01-30 8:52 ` Paolo Bonzini
2015-01-30 13:06 ` Radim Krčmář
2015-02-02 14:26 ` Radim Krčmář
2015-02-02 14:28 ` Paolo Bonzini
2015-02-02 14:30 ` Radim Krčmář [this message]
2015-02-02 14:29 ` Radim Krčmář
2015-01-29 21:48 ` [PATCH 3/8] KVM: x86: replace 0 with APIC_DEST_PHYSICAL Radim Krčmář
2015-01-29 21:48 ` [PATCH 4/8] KVM: x86: fix x2apic logical address matching Radim Krčmář
2015-01-29 21:48 ` [PATCH 5/8] KVM: x86: use MDA for interrupt matching Radim Krčmář
2015-01-30 9:03 ` Paolo Bonzini
2015-01-30 13:09 ` Radim Krčmář
2015-01-29 21:48 ` [PATCH 6/8] KVM: x86: allow mixed APIC mode broadcast Radim Krčmář
2015-01-29 21:48 ` [PATCH 7/8] KVM: x86: avoid logical_map when it is invalid Radim Krčmář
2015-01-30 9:19 ` Paolo Bonzini
2015-01-30 14:21 ` Radim Krčmář
2015-01-30 14:21 ` Paolo Bonzini
2015-01-30 9:38 ` Paolo Bonzini
2015-01-30 14:56 ` Radim Krčmář
2015-01-30 15:10 ` Paolo Bonzini
2015-01-30 17:09 ` Radim Krčmář
2015-01-29 21:48 ` [PATCH 8/8] KVM: x86: simplify kvm_apic_map Radim Krčmář
2015-01-30 9:18 ` Paolo Bonzini
2015-01-30 15:14 ` Radim Krčmář
2015-01-30 15:23 ` Paolo Bonzini
2015-01-30 16:57 ` Radim Krčmář
2015-01-30 21:15 ` Paolo Bonzini
2015-01-30 9:22 ` [PATCH 0/8] KVM: minor APIC fixes and cleanups Paolo Bonzini
2015-01-30 15:20 ` Radim Krčmář
2015-01-30 15:24 ` Paolo Bonzini
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