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powerpc/mm/hugetlb: Add flush_hugetlb_tlb_range

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Some archs like ppc64 need to do special things when flushing tlb for
hugepage. Add a new helper to flush hugetlb tlb range. This helps us to
avoid flushing the entire tlb mapping for the pid.

Signed-off-by: Aneesh Kumar K.V <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
This commit is contained in:
Aneesh Kumar K.V 2016-07-13 15:06:43 +05:30 • committed by Michael Ellerman
commit 5491ae7b6f
4 changed files with 31 additions and 1 deletions
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10
mm/hugetlb.c
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@ -3938,6 +3938,14 @@ same_page:
return i ? i : -EFAULT;
}
#ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
/*
* ARCHes with special requirements for evicting HUGETLB backing TLB entries can
* implement this.
*/
#define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
#endif
unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
unsigned long address, unsigned long end, pgprot_t newprot)
{
@ -3998,7 +4006,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
* once we release i_mmap_rwsem, another task can do the final put_page
* and that page table be reused and filled with junk.
*/
flush_tlb_range(vma, start, end);
flush_hugetlb_tlb_range(vma, start, end);
mmu_notifier_invalidate_range(mm, start, end);
i_mmap_unlock_write(vma->vm_file->f_mapping);
mmu_notifier_invalidate_range_end(mm, start, end);