thp: rename split_huge_page_pmd() to split_huge_pmd()
We are going to decouple splitting THP PMD from splitting underlying
compound page.
This patch renames split_huge_page_pmd*() functions to split_huge_pmd*()
to reflect the fact that it doesn't imply page splitting, only PMD.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Tested-by: Sasha Levin <sasha.levin@oracle.com>
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Steve Capper <steve.capper@linaro.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index f4da89c..0d70ec0 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1233,13 +1233,13 @@
if (unlikely(!new_page)) {
if (!page) {
- split_huge_page_pmd(vma, address, pmd);
+ split_huge_pmd(vma, pmd, address);
ret |= VM_FAULT_FALLBACK;
} else {
ret = do_huge_pmd_wp_page_fallback(mm, vma, address,
pmd, orig_pmd, page, haddr);
if (ret & VM_FAULT_OOM) {
- split_huge_page(page);
+ split_huge_pmd(vma, pmd, address);
ret |= VM_FAULT_FALLBACK;
}
put_user_huge_page(page);
@@ -1252,10 +1252,10 @@
true))) {
put_page(new_page);
if (page) {
- split_huge_page(page);
+ split_huge_pmd(vma, pmd, address);
put_user_huge_page(page);
} else
- split_huge_page_pmd(vma, address, pmd);
+ split_huge_pmd(vma, pmd, address);
ret |= VM_FAULT_FALLBACK;
count_vm_event(THP_FAULT_FALLBACK);
goto out;
@@ -3131,17 +3131,7 @@
goto again;
}
-void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
- pmd_t *pmd)
-{
- struct vm_area_struct *vma;
-
- vma = find_vma(mm, address);
- BUG_ON(vma == NULL);
- split_huge_page_pmd(vma, address, pmd);
-}
-
-static void split_huge_page_address(struct mm_struct *mm,
+static void split_huge_pmd_address(struct vm_area_struct *vma,
unsigned long address)
{
pgd_t *pgd;
@@ -3150,7 +3140,7 @@
VM_BUG_ON(!(address & ~HPAGE_PMD_MASK));
- pgd = pgd_offset(mm, address);
+ pgd = pgd_offset(vma->vm_mm, address);
if (!pgd_present(*pgd))
return;
@@ -3159,13 +3149,13 @@
return;
pmd = pmd_offset(pud, address);
- if (!pmd_present(*pmd))
+ if (!pmd_present(*pmd) || !pmd_trans_huge(*pmd))
return;
/*
* Caller holds the mmap_sem write mode, so a huge pmd cannot
* materialize from under us.
*/
- split_huge_page_pmd_mm(mm, address, pmd);
+ __split_huge_page_pmd(vma, address, pmd);
}
void vma_adjust_trans_huge(struct vm_area_struct *vma,
@@ -3181,7 +3171,7 @@
if (start & ~HPAGE_PMD_MASK &&
(start & HPAGE_PMD_MASK) >= vma->vm_start &&
(start & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE <= vma->vm_end)
- split_huge_page_address(vma->vm_mm, start);
+ split_huge_pmd_address(vma, start);
/*
* If the new end address isn't hpage aligned and it could
@@ -3191,7 +3181,7 @@
if (end & ~HPAGE_PMD_MASK &&
(end & HPAGE_PMD_MASK) >= vma->vm_start &&
(end & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE <= vma->vm_end)
- split_huge_page_address(vma->vm_mm, end);
+ split_huge_pmd_address(vma, end);
/*
* If we're also updating the vma->vm_next->vm_start, if the new
@@ -3205,6 +3195,6 @@
if (nstart & ~HPAGE_PMD_MASK &&
(nstart & HPAGE_PMD_MASK) >= next->vm_start &&
(nstart & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE <= next->vm_end)
- split_huge_page_address(next->vm_mm, nstart);
+ split_huge_pmd_address(next, nstart);
}
}