The patch titled
mm: add zap_vma_ptes(): a library function to unmap driver ptes
has been added to the -mm tree. Its filename is
mm-add-zap_vma_ptes-a-library-function-to-unmap-driver-ptes.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
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
@@ -743,6 +743,8 @@ 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
@@ -993,6 +993,29 @@ 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
linux-next.patch
mmu-notifiers-add-list_del_init_rcu.patch
mmu-notifiers-add-mm_take_all_locks-operation.patch
mmu-notifiers-add-mm_take_all_locks-operation-checkpatch-fixes.patch
mmu-notifier-core.patch
mmu-notifier-core-fix.patch
mmu-notifier-core-fix-2.patch
mm-add-zap_vma_ptes-a-library-function-to-unmap-driver-ptes.patch
gru-driver-v3-hardware-data-structures.patch
gru-driver-v3-gru-instructions-macros.patch
gru-driver-v3-driver-internal-header-files.patch
gru-driver-v3-kernel-services-header-files.patch
gru-driver-v3-driver-initialization-file-vma-ops.patch
gru-driver-v3-page-faults-exceptions.patch
gru-driver-v3-page-faults-exceptions-gru-virtual-physical-translation.patch
gru-driver-v3-kernel-services-provide-by-driver.patch
gru-driver-v3-resource-management.patch
gru-driver-v3-resource-management-unmap-driver-ptes-gru.patch
gru-driver-v3-proc-interfaces.patch
gru-driver-v3-tlb-flushing-mmuops-callouts.patch
gru-driver-v3-driver-makefile.patch
gru-driver-v3-export-is_uv_system-zap_page_range-follow_page.patch
gru-driver-v3-driver-misc-makefile-kconfig-changes.patch
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