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Commit c627f9cc authored by Jack Steiner's avatar Jack Steiner Committed by Linus Torvalds
Browse files

mm: add zap_vma_ptes(): a library function to unmap driver ptes 



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: default avatarJack Steiner <steiner@sgi.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f718cd4a

include/linux/mm.h

+2 −0
Original line number Original line Diff line number Diff line
@@ -744,6 +744,8 @@ struct zap_details { 
struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,

struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,

		pte_t pte);

		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 zap_page_range(struct vm_area_struct *vma, unsigned long address,

		unsigned long size, struct zap_details *);

		unsigned long size, struct zap_details *);

unsigned long unmap_vmas(struct mmu_gather **tlb,

unsigned long unmap_vmas(struct mmu_gather **tlb,

mm/memory.c

+23 −0
Original line number Original line Diff line number Diff line
@@ -994,6 +994,29 @@ unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address, 
	return end;

	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.

 * Do a quick page-table lookup for a single page.

 */

 */