From: Bjorn Helgaas <bjorn.helgaas@hp.com>
To: linux-ia64@vger.kernel.org
Subject: [patch 3/5] ia64: allow WB /sys/.../legacy_mem mmaps
Date: Fri, 30 Mar 2007 16:34:44 +0000 [thread overview]
Message-ID: <200703301034.44253.bjorn.helgaas@hp.com> (raw)
In-Reply-To: <200703211621.49988.bjorn.helgaas@hp.com>
Allow cacheable mmaps of legacy_mem if WB access is supported for the region.
The "legacy_mem" file often contains a shadow option ROM, and some versions of
X depend on this.
Tim Yamin <plasm@roo.me.uk> reported that this change fixes X on a Dell
PowerEdge 3250.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Index: work-mm10/arch/ia64/pci/pci.c
=================================--- work-mm10.orig/arch/ia64/pci/pci.c 2007-03-21 14:13:22.000000000 -0700
+++ work-mm10/arch/ia64/pci/pci.c 2007-03-21 14:15:01.000000000 -0700
@@ -656,8 +656,6 @@
return -EINVAL;
prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
vma->vm_page_prot);
- if (pgprot_val(prot) != pgprot_val(pgprot_noncached(vma->vm_page_prot)))
- return -EINVAL;
addr = pci_get_legacy_mem(bus);
if (IS_ERR(addr))
prev parent reply other threads:[~2007-03-30 16:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-21 22:21 [patch 3/5] ia64: allow WB /sys/.../legacy_mem mmaps Bjorn Helgaas
2007-03-30 16:34 ` Bjorn Helgaas [this message]
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