x86: UV SGI: Don't track GRU space in PAT
GRU space is always mapped as WB in the page table. There is
no need to track the mappings in the PAT. This also eliminates
the "freeing invalid memtype" messages when the GRU space is
unmapped.
Signed-off-by: Jack Steiner <steiner@sgi.com>
LKML-Reference: <20091119202341.GA4420@sgi.com>
[ v2: fix build failure ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index e78cd0e..38a66ef 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -20,6 +20,7 @@
#include <asm/cacheflush.h>
#include <asm/processor.h>
#include <asm/tlbflush.h>
+#include <asm/x86_init.h>
#include <asm/pgtable.h>
#include <asm/fcntl.h>
#include <asm/e820.h>
@@ -348,6 +349,11 @@
return 0;
}
+int default_is_untracked_pat_range(u64 start, u64 end)
+{
+ return is_ISA_range(start, end);
+}
+
/*
* req_type typically has one of the:
* - _PAGE_CACHE_WB
@@ -388,7 +394,7 @@
}
/* Low ISA region is always mapped WB in page table. No need to track */
- if (is_ISA_range(start, end - 1)) {
+ if (x86_platform.is_untracked_pat_range(start, end - 1)) {
if (new_type)
*new_type = _PAGE_CACHE_WB;
return 0;
@@ -499,7 +505,7 @@
return 0;
/* Low ISA region is always mapped WB. No need to track */
- if (is_ISA_range(start, end - 1))
+ if (x86_platform.is_untracked_pat_range(start, end - 1))
return 0;
is_range_ram = pat_pagerange_is_ram(start, end);
@@ -582,7 +588,7 @@
int rettype = _PAGE_CACHE_WB;
struct memtype *entry;
- if (is_ISA_range(paddr, paddr + PAGE_SIZE - 1))
+ if (x86_platform.is_untracked_pat_range(paddr, paddr + PAGE_SIZE - 1))
return rettype;
if (pat_pagerange_is_ram(paddr, paddr + PAGE_SIZE)) {