On 5/30/07, Akemi Yagi <amyagi@xxxxxxxxx> wrote:
On 5/30/07, Feizhou <feizhou@xxxxxxxxxxxx> wrote:
> Dan Halbert wrote:
> > Feizhou wrote:
> > I searched for the commit id in the Redhat bugzilla, and found it for
> > RHEL5: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=238709. That
> > bug says the fix has been backported and is in RHEL5 kernel
> > 2.6.18-18.el5. But I don't see anything about backporting to RHEL4.
>
> I see. So forget RAM >= 4GB on Centos 4 on AMD AM2. Hmmph.
Well, not really. There seems to be a test kernel (2.6.9-42.EL) with
this bug fix at:
http://people.redhat.com/coldwell/kernel/bugs/223238/
Therefore, upstream may be working on backporting for RHEL4
(hopefully). Note also that the official patched version for CentOS 5
will not be available for a while either. The 2.6.18-18.el5 kernel
might be for RHEL 5.1.
Because the patch is available now, another option is to rebuild the
kernel by applying it. Certainly not for everyone but if the fix is
needed right now, this is the olny option.
Akemi
The patch file for this bug did not work on the CentOS source file as
such. I have recreated it for CentOS 5.0 x86_64 (see below) and was
able to rebuild kernels. It you ever decided to do the same, here's
the modified patch, pci-gart.c :
--- 2.6-git.orig/arch/x86_64/kernel/pci-gart.c
+++ 2.6-git/arch/x86_64/kernel/pci-gart.c
@@ -523,6 +523,10 @@
gatt = (void *)__get_free_pages(GFP_KERNEL, get_order(gatt_size));
if (!gatt)
panic("Cannot allocate GATT table");
+ if (change_page_attr_addr((unsigned long)gatt, gatt_size >>
PAGE_SHIFT, PAGE_KERNEL_NOCACHE))
+ panic("Could not set GART PTEs to uncacheable pages");
+ global_flush_tlb();
+
memset(gatt, 0, gatt_size);
agp_gatt_table = gatt;
================================
Then edit the kernel-2.6.spec file as follows:
Add this at line ~935 or so
Patch40000: pci_new.patch
Add this at line ~1908 or so
%patch40000 -p1
Good luck,
Akemi
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