Re: [RESEND PATCH v2 1/4] PCI: Ignore resource_alignment if PCI_PROBE_ONLY was set\\

From: Yongji Xie
Date: Tue Jun 21 2016 - 00:47:08 EST

On 2016/6/21 9:43, Bjorn Helgaas wrote:

On Thu, Jun 02, 2016 at 01:46:48PM +0800, Yongji Xie wrote:
The resource_alignment will releases memory resources allocated
by firmware so that kernel can reassign new resources later on.
But this will cause the problem that no resources can be
allocated by kernel if PCI_PROBE_ONLY was set, e.g. on pSeries
platform because PCI_PROBE_ONLY force kernel to use firmware
setup and not to reassign any resources.

To solve this problem, this patch ignores resource_alignment
if PCI_PROBE_ONLY was set.

Signed-off-by: Yongji Xie <xyjxie@xxxxxxxxxxxxxxxxxx>
drivers/pci/pci.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index c8b4dbd..a259394 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4761,6 +4761,12 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev)
p = resource_alignment_param;
while (*p) {
+ if (pci_has_flag(PCI_PROBE_ONLY)) {
+ printk(KERN_ERR "PCI: Ignore resource_alignment parameter: %s with PCI_PROBE_ONLY set\n",
+ p);
+ *p = 0;
+ break;
Wouldn't it be simpler to make pci_set_resource_alignment_param() fail
if PCI_PROBE_ONLY is set?

I add the check here because I want to print some logs so that users
could know the reason why resource_alignment doesn't work when
they add this parameter.


+ }
count = 0;
if (sscanf(p, "%d%n", &align_order, &count) == 1 &&
p[count] == '@') {

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