+ vmalloc-use-apply_to_page_range_batch-for-vunmap_page_range.patch added to -mm tree

+ vmalloc-use-apply_to_page_range_batch-for-vunmap_page_range.patch added to -mm tree

[akpm]

The patch titled
     vmalloc: use apply_to_page_range_batch() for vunmap_page_range()
has been added to the -mm tree.  Its filename is
     vmalloc-use-apply_to_page_range_batch-for-vunmap_page_range.patch

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------------------------------------------------------
Subject: vmalloc: use apply_to_page_range_batch() for vunmap_page_range()
From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

There's no need to open-code it when there's helpful utility function to
do the job.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vmalloc.c |   53 ++++++++-----------------------------------------
 1 file changed, 9 insertions(+), 44 deletions(-)

diff -puN mm/vmalloc.c~vmalloc-use-apply_to_page_range_batch-for-vunmap_page_range mm/vmalloc.c
--- a/mm/vmalloc.c~vmalloc-use-apply_to_page_range_batch-for-vunmap_page_range
+++ a/mm/vmalloc.c
@@ -33,59 +33,24 @@
 
 /*** Page table manipulation functions ***/
 
-static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end)
+static int vunmap_pte(pte_t *pte, unsigned count,
+		      unsigned long addr, void *data)
 {
-	pte_t *pte;
-
-	pte = pte_offset_kernel(pmd, addr);
-	do {
+	while (count--) {
 		pte_t ptent = *pte;
-		WARN_ON(!pte_none(ptent) && !pte_present(ptent));
-		pte_clear(&init_mm, addr, pte);
-	} while (pte++, addr += PAGE_SIZE, addr != end);
-}
-
-static void vunmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end)
-{
-	pmd_t *pmd;
-	unsigned long next;
 
-	pmd = pmd_offset(pud, addr);
-	do {
-		next = pmd_addr_end(addr, end);
-		if (pmd_none_or_clear_bad(pmd))
-			continue;
-		vunmap_pte_range(pmd, addr, next);
-	} while (pmd++, addr = next, addr != end);
-}
+		WARN_ON(!pte_none(ptent) && !pte_present(ptent));
 
-static void vunmap_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end)
-{
-	pud_t *pud;
-	unsigned long next;
+		pte_clear(&init_mm, addr, pte++);
+		addr += PAGE_SIZE;
+	}
 
-	pud = pud_offset(pgd, addr);
-	do {
-		next = pud_addr_end(addr, end);
-		if (pud_none_or_clear_bad(pud))
-			continue;
-		vunmap_pmd_range(pud, addr, next);
-	} while (pud++, addr = next, addr != end);
+	return 0;
 }
 
 static void vunmap_page_range(unsigned long addr, unsigned long end)
 {
-	pgd_t *pgd;
-	unsigned long next;
-
-	BUG_ON(addr >= end);
-	pgd = pgd_offset_k(addr);
-	do {
-		next = pgd_addr_end(addr, end);
-		if (pgd_none_or_clear_bad(pgd))
-			continue;
-		vunmap_pud_range(pgd, addr, next);
-	} while (pgd++, addr = next, addr != end);
+	apply_to_page_range_batch(&init_mm, addr, end - addr, vunmap_pte, NULL);
 }
 
 static int vmap_pte_range(pmd_t *pmd, unsigned long addr,
_

Patches currently in -mm which might be from jeremy.fitzhardinge@citrix.com are

linux-next.patch
mm-remove-unused-token-argument-from-apply_to_page_range-callback.patch
mm-add-apply_to_page_range_batch.patch
ioremap-use-apply_to_page_range_batch-for-ioremap_page_range.patch
vmalloc-use-plain-pte_clear-for-unmaps.patch
vmalloc-use-apply_to_page_range_batch-for-vunmap_page_range.patch
vmalloc-use-apply_to_page_range_batch-for-vmap_page_range_noflush.patch
vmalloc-use-apply_to_page_range_batch-in-alloc_vm_area.patch
xen-mmu-use-apply_to_page_range_batch-in-xen_remap_domain_mfn_range.patch
xen-grant-table-use-apply_to_page_range_batch.patch