linux-kernel - Re: SNB PCI root information

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Date:	Wed, 20 Jun 2012 13:11:26 -0400
From:	Ulrich Drepper <drepper@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, jbarnes@...tuousgeek.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	lenb@...nel.org, x86@...nel.org, linux-pci@...r.kernel.org
Subject: Re: SNB PCI root information

On Tue, Jun 19, 2012 at 2:20 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> If the BIOS provide wrong _PXM, that BIOS really should be fixed at first.

Let's go there when we see BIOSes with the information...

In the meantime I tested the patch.  It needs the small modification
below (iinterdiff-generated).  The problem is the pci= parameter
handling uses ',' to separate parameters and therefore the second PCI
root information, separated by a comma, is interpreted as a new pci=
parameter.  The patch below changes the separator to ';'.  With that I
get the correct information after boot up.


Signed-off-by: Ulrich Drepper <drepper@...il.com>

diff -u b/Documentation/kernel-parameters.txt
b/Documentation/kernel-parameters.txt
--- b/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2192,7 +2192,7 @@
 		realloc		same as realloc=on
 		busnum_node=
 				Format:
-				<bus>:<node>[, ...]
+				<bus>:<node>[;...]
 				Specifies node for bus
 		noari		do not use PCIe ARI.
 		pcie_scan_all	Scan all possible PCIe devices.  Otherwise we
diff -u b/arch/x86/pci/common.c b/arch/x86/pci/common.c
--- b/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -509,7 +509,7 @@
 		}
 		set_mp_bus_to_node(bus, node);
 		p += count;
-		if (*p != ',')
+		if (*p != ';')
 			break;
 		p++;
 	}
--
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