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x86: PAT: move track untrack pfnmap stubs to asm-generic

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Impact: Cleanup and branch hints only.

Move the track and untrack pfn stub routines from memory.c to asm-generic.
Also add unlikely to pfnmap related calls in fork and exit path.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
venkatesh.pallipadi@intel.com
2008-12-19 13:47:29 -08:00
committed by H. Peter Anvin
parent 982d789ab7
commit 34801ba9bf
4 changed files with 51 additions and 57 deletions
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48
mm/memory.c
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@@ -99,50 +99,6 @@ int randomize_va_space __read_mostly =
2;
#endif
#ifndef track_pfn_vma_new
/*
* Interface that can be used by architecture code to keep track of
* memory type of pfn mappings (remap_pfn_range, vm_insert_pfn)
*
* track_pfn_vma_new is called when a _new_ pfn mapping is being established
* for physical range indicated by pfn and size.
*/
int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t prot,
unsigned long pfn, unsigned long size)
{
return 0;
}
#endif
#ifndef track_pfn_vma_copy
/*
* Interface that can be used by architecture code to keep track of
* memory type of pfn mappings (remap_pfn_range, vm_insert_pfn)
*
* track_pfn_vma_copy is called when vma that is covering the pfnmap gets
* copied through copy_page_range().
*/
int track_pfn_vma_copy(struct vm_area_struct *vma)
{
return 0;
}
#endif
#ifndef untrack_pfn_vma
/*
* Interface that can be used by architecture code to keep track of
* memory type of pfn mappings (remap_pfn_range, vm_insert_pfn)
*
* untrack_pfn_vma is called while unmapping a pfnmap for a region.
* untrack can be called for a specific region indicated by pfn and size or
* can be for the entire vma (in which case size can be zero).
*/
void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn,
unsigned long size)
{
}
#endif
static int __init disable_randmaps(char *s)
{
randomize_va_space = 0;
@@ -713,7 +669,7 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
if (is_vm_hugetlb_page(vma))
return copy_hugetlb_page_range(dst_mm, src_mm, vma);
if (is_pfn_mapping(vma)) {
if (unlikely(is_pfn_mapping(vma))) {
/*
* We do not free on error cases below as remove_vma
* gets called on error from higher level routine
@@ -969,7 +925,7 @@ unsigned long unmap_vmas(struct mmu_gather **tlbp,
if (vma->vm_flags & VM_ACCOUNT)
*nr_accounted += (end - start) >> PAGE_SHIFT;
if (is_pfn_mapping(vma))
if (unlikely(is_pfn_mapping(vma)))
untrack_pfn_vma(vma, 0, 0);
while (start != end) {