From: Keir Fraser <keir@xen.org>
To: Jan Beulich <JBeulich@suse.com>, xen-devel <xen-devel@lists.xen.org>
Cc: joe.jin@oracle.com
Subject: Re: [PATCH, v2] x86: fix off-by-one in nr_irqs_gsi calculation
Date: Fri, 27 Jul 2012 09:01:26 +0100 [thread overview]
Message-ID: <CC380966.46C71%keir@xen.org> (raw)
In-Reply-To: <501253AF0200007800090D7F@nat28.tlf.novell.com>
On 27/07/2012 07:39, "Jan Beulich" <JBeulich@suse.com> wrote:
> highest_gsi() returns the last valid GSI, not a count.
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
> ---
> v2: Retain the (debatable) use of max() here.
>
> --- a/xen/arch/x86/io_apic.c
> +++ b/xen/arch/x86/io_apic.c
> @@ -2531,7 +2531,7 @@ void __init init_ioapic_mappings(void)
> }
> }
>
> - nr_irqs_gsi = max(nr_irqs_gsi, highest_gsi());
> + nr_irqs_gsi = max(nr_irqs_gsi, highest_gsi() + 1);
>
> if ( max_gsi_irqs == 0 )
> max_gsi_irqs = nr_irqs ? nr_irqs / 8 : PAGE_SIZE;
>
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
next prev parent reply other threads:[~2012-07-27 8:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-27 6:39 [PATCH, v2] x86: fix off-by-one in nr_irqs_gsi calculation Jan Beulich
2012-07-27 6:44 ` Joe Jin
2012-07-27 8:01 ` Keir Fraser [this message]
2012-07-30 7:53 ` Jan Beulich
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