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mm: mempolicy: Implement change_prot_numa() in terms of change_protection()

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This patch converts change_prot_numa() to use change_protection(). As
pte_numa and friends check the PTE bits directly it is necessary for
change_protection() to use pmd_mknuma(). Hence the required
modifications to change_protection() are a little clumsy but the
end result is that most of the numa page table helpers are just one or
two instructions.

Signed-off-by: Mel Gorman <mgorman@suse.de>
This commit is contained in:
Mel Gorman 2012-10-25 14:16:32 +02:00
commit 4b10e7d562
5 changed files with 85 additions and 145 deletions
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4
include/linux/mm.h
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@ -1080,7 +1080,7 @@ extern unsigned long do_mremap(unsigned long addr,
unsigned long flags, unsigned long new_addr);
extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start,
unsigned long end, pgprot_t newprot,
int dirty_accountable);
int dirty_accountable, int prot_numa);
extern int mprotect_fixup(struct vm_area_struct *vma,
struct vm_area_struct **pprev, unsigned long start,
unsigned long end, unsigned long newflags);
@ -1552,7 +1552,7 @@ static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
#endif
#ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE
void change_prot_numa(struct vm_area_struct *vma,
unsigned long change_prot_numa(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
#endif