xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86: UV SGI: Don't track GRU space in PAT

Browse Source 
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>
This commit is contained in:
Jack Steiner
2009-11-19 14:23:41 -06:00
committed by Ingo Molnar
parent e38e2af1c5
commit fd12a0d69a
5 changed files with 33 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
arch/x86/mm/pat.c
View File

@@ -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 @@ static int free_ram_pages_type(u64 start, u64 end)
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 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
}
/* 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 @@ int free_memtype(u64 start, u64 end)
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 @@ static unsigned long lookup_memtype(u64 paddr)
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)) {