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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2016-07-13 15:06:43 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2016-08-01 11:15:13 +1000
commit5491ae7b6f48499b8892822cff371746f0b4102f (patch)
treea8bb6c61ba9276e1b64d4ad2ef1b6c10b8508929 /mm/hugetlb.c
parentfbfa26d85418a155feacdb0f73cbf938f1027a8c (diff)
downloadlinux-5491ae7b6f48499b8892822cff371746f0b4102f.tar.bz2
powerpc/mm/hugetlb: Add flush_hugetlb_tlb_range
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 <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f904246a8fd5..af2d88253bfc 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -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);