[PATCH] EFI: keep physical table addresses in efi structure

Almost all users of the table addresses from the EFI system table want
physical addresses.  So rather than doing the pa->va->pa conversion, just keep
physical addresses in struct efi.

This fixes a DMI bug: the efi structure contained the physical SMBIOS address
on x86 but the virtual address on ia64, so dmi_scan_machine() used ioremap()
on a virtual address on ia64.

This is essentially the same as an earlier patch by Matt Tolentino:
	http://marc.theaimsgroup.com/?l=linux-kernel&m=112130292316281&w=2
except that this changes all table addresses, not just ACPI addresses.

Matt's original patch was backed out because it caused MCAs on HP sx1000
systems.  That problem is resolved by the ioremap() attribute checking added
for ia64.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Matt Domsch <Matt_Domsch@dell.com>
Cc: "Tolentino, Matthew E" <matthew.e.tolentino@intel.com>
Cc: "Brown, Len" <len.brown@intel.com>
Cc: Andi Kleen <ak@muc.de>
Acked-by: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index a4e218ce2edb..58c93a30348c 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -651,9 +651,9 @@ unsigned long __init acpi_find_rsdp(void)
 {
         unsigned long rsdp_phys = 0;
 
-        if (efi.acpi20)
-                rsdp_phys = __pa(efi.acpi20);
-        else if (efi.acpi)
+        if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
+                rsdp_phys = efi.acpi20;
+        else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
                 printk(KERN_WARNING PREFIX
                        "v1.0/r0.71 tables no longer supported\n");
         return rsdp_phys;