The patch titled
mm: add zap_vma_ptes(): a library function to unmap driver ptes
has been removed from the -mm tree. Its filename was
mm-add-zap_vma_ptes-a-library-function-to-unmap-driver-ptes.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: mm: add zap_vma_ptes(): a library function to unmap driver ptes
From: Jack Steiner <steiner@xxxxxxx>
zap_vma_ptes() is intended to be used by drivers to unmap ptes assigned to the
driver private vmas. This interface is similar to zap_page_range() but is
less general & less likely to be abused.
Needed by the GRU driver.
Signed-off-by: Jack Steiner <steiner@xxxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Cc: Hugh Dickins <hugh@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 2 ++
mm/memory.c | 23 +++++++++++++++++++++++
2 files changed, 25 insertions(+)
diff -puN include/linux/mm.h~mm-add-zap_vma_ptes-a-library-function-to-unmap-driver-ptes include/linux/mm.h
--- a/include/linux/mm.h~mm-add-zap_vma_ptes-a-library-function-to-unmap-driver-ptes
+++ a/include/linux/mm.h
@@ -744,6 +744,8 @@ struct zap_details {
struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
pte_t pte);
+int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
+ unsigned long size);
unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address,
unsigned long size, struct zap_details *);
unsigned long unmap_vmas(struct mmu_gather **tlb,
diff -puN mm/memory.c~mm-add-zap_vma_ptes-a-library-function-to-unmap-driver-ptes mm/memory.c
--- a/mm/memory.c~mm-add-zap_vma_ptes-a-library-function-to-unmap-driver-ptes
+++ a/mm/memory.c
@@ -994,6 +994,29 @@ unsigned long zap_page_range(struct vm_a
return end;
}
+/**
+ * zap_vma_ptes - remove ptes mapping the vma
+ * @vma: vm_area_struct holding ptes to be zapped
+ * @address: starting address of pages to zap
+ * @size: number of bytes to zap
+ *
+ * This function only unmaps ptes assigned to VM_PFNMAP vmas.
+ *
+ * The entire address range must be fully contained within the vma.
+ *
+ * Returns 0 if successful.
+ */
+int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
+ unsigned long size)
+{
+ if (address < vma->vm_start || address + size > vma->vm_end ||
+ !(vma->vm_flags & VM_PFNMAP))
+ return -1;
+ zap_page_range(vma, address, size, NULL);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(zap_vma_ptes);
+
/*
* Do a quick page-table lookup for a single page.
*/
_
Patches currently in -mm which might be from steiner@xxxxxxx are
origin.patch
linux-next.patch
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