linux-kernel - Re: [PATCH] kvm: svm: fix unsigned compare less than zero comparison

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Date:   Mon, 19 Sep 2016 12:06:05 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Colin King <colin.king@...onical.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kvm: svm: fix unsigned compare less than zero comparison

On Mon, Sep 19, 2016 at 07:11:59AM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> vm_data->avic_vm_id is a u32, so the check for a error
> return (less than zero) such as -EAGAIN from
> avic_get_next_vm_id currently has no effect whatsoever.
> Fix this by using a temporary int for the comparison
> and assign vm_data->avic_vm_id to this. I used an explicit
> u32 cast in the assignment to show why vm_data->avic_vm_id
> cannot be used in the assign/compare steps.
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Acked-by: Joerg Roedel <jroedel@...e.de>