linux-kernel - Re: [Xen-devel] Re: [PATCH] Modpost section mismatch fix

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Date:	Fri, 8 Jul 2011 01:18:51 +0530
From:	Raghavendra D Prabhu <rprabhu@...hang.net>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	xen-devel@...ts.xensource.com, jeremy.fitzhardinge@...rix.com,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, Ian Campbell <ijc@...lion.org.uk>
Subject: Re: [Xen-devel] Re: [PATCH] Modpost section mismatch fix

* On Thu, Jul 07, 2011 at 12:24:54PM -0400, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
>> Tested it. Works now.
>
>Ok, Stuck Tested-by on the patch. Hopefully Linus hasn't pulled it yet.
Ok.
>
>> Reviewed-by: Raghavendra Prabhu <rprabhu@...hang.net>

>> Also,
>> The condition for acpi_gsi_to_irq can be removed since it always returns zero.
>
>The function might in the future return something that is non-zero
>and we should guard for it. Also you make 'irq' be unsigned which is not
>good as the IRQ 0 is a valid value - and with making it unsigned if it is
>set to -1 (the -1 is the invalid IRQ value) the check for 'irq != gsi'
>will be true and and we will pass in -1 casted to unsigned. That is a
>large value and not the right thing we want to pass to xen_register_gsi.

My rationale for the unsigned part was that acpi_gsi_to_irq always
assigns a positive value (>= 0) to the irq passed (as unsigned
argument). But even otherwise that shouldn't make much of difference I guess.

Also,
I had sent another change (oneline) for the file
arch/x86/xen/platform-pci-unplug.c for check_platform_magic, looks like that has not gone into
the pull request for Linus.
>
>
>> ============================================
>>  diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
>>  index f567965..3faa55b 100644
>>  --- a/arch/x86/pci/xen.c
>>  +++ b/arch/x86/pci/xen.c
>>  @@ -405,7 +405,7 @@ static __init void xen_setup_acpi_sci(void)
>>          int rc;
>>          int trigger, polarity;
>>          int gsi = acpi_sci_override_gsi;
>>  -       int irq = -1;
>>  +       unsigned int irq = 0u;
>>          int gsi_override = -1;

>>          if (!gsi)
>>  @@ -435,11 +435,10 @@ static __init void xen_setup_acpi_sci(void)
>>           * setup as we had setup IRQ 20 for it).
>>           */
>>          /* Check whether the GSI != IRQ */
>>  -       if (acpi_gsi_to_irq(gsi, &irq) == 0) {
>>  -               if (irq >= 0 && irq != gsi)
>>  -                       /* Bugger, we MUST have that IRQ. */
>>  -                       gsi_override = irq;
>>  -       }
>>  +       acpi_gsi_to_irq(gsi, &irq);
>>  +       if (irq != gsi)
>>  +               /* Bugger, we MUST have that IRQ. */
>>  +               gsi_override = irq;

>>          gsi = xen_register_gsi(gsi, gsi_override, trigger, polarity);
>>          printk(KERN_INFO "xen: acpi sci %d\n", gsi);


>> --------------------------
>> Raghavendra Prabhu
>> GPG Id : 0xD72BE977
>> Fingerprint: B93F EBCB 8E05 7039 CD3C A4B8 A616 DCA1 D72B E977
>> www: wnohang.net
>
>
>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@...ts.xensource.com
>> http://lists.xensource.com/xen-devel
>
--------------------------
Raghavendra Prabhu
GPG Id : 0xD72BE977
Fingerprint: B93F EBCB 8E05 7039 CD3C A4B8 A616 DCA1 D72B E977
www: wnohang.net

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