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Commit a520110e authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jason Gunthorpe
Browse files

mm: split out a new pagewalk.h header from mm.h 

Add a new header for the two handful of users of the walk_page_range /
walk_page_vma interface instead of polluting all users of mm.h with it.

Link: https://lore.kernel.org/r/20190828141955.22210-2-hch@lst.de


Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarThomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: default avatarSteven Price <steven.price@arm.com>
Reviewed-by: default avatarJason Gunthorpe <jgg@mellanox.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
parent 810e24e0

arch/openrisc/kernel/dma.c

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
 */



#include <linux/dma-noncoherent.h>

#include <linux/pagewalk.h>



#include <asm/cpuinfo.h>

#include <asm/spr_defs.h>

arch/powerpc/mm/book3s64/subpage_prot.c

+1 −1
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ 
#include <linux/kernel.h>

#include <linux/gfp.h>

#include <linux/types.h>

#include <linux/mm.h>

#include <linux/pagewalk.h>

#include <linux/hugetlb.h>

#include <linux/syscalls.h>

arch/s390/mm/gmap.c

+1 −1
Original line number Diff line number Diff line
@@ -9,7 +9,7 @@ 
 */



#include <linux/kernel.h>

#include <linux/mm.h>

#include <linux/pagewalk.h>

#include <linux/swap.h>

#include <linux/smp.h>

#include <linux/spinlock.h>

fs/proc/task_mmu.c

+1 −1
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <linux/mm.h>

#include <linux/pagewalk.h>

#include <linux/vmacache.h>

#include <linux/hugetlb.h>

#include <linux/huge_mm.h>

include/linux/mm.h

+0 −46
Original line number Diff line number Diff line
@@ -1430,54 +1430,8 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long address, 
void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,

		unsigned long start, unsigned long end);



/**

 * mm_walk - callbacks for walk_page_range

 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry

 *	       this handler should only handle pud_trans_huge() puds.

 *	       the pmd_entry or pte_entry callbacks will be used for

 *	       regular PUDs.

 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry

 *	       this handler is required to be able to handle

 *	       pmd_trans_huge() pmds.  They may simply choose to

 *	       split_huge_page() instead of handling it explicitly.

 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry

 * @pte_hole: if set, called for each hole at all levels

 * @hugetlb_entry: if set, called for each hugetlb entry

 * @test_walk: caller specific callback function to determine whether

 *             we walk over the current vma or not. Returning 0

 *             value means "do page table walk over the current vma,"

 *             and a negative one means "abort current page table walk

 *             right now." 1 means "skip the current vma."

 * @mm:        mm_struct representing the target process of page table walk

 * @vma:       vma currently walked (NULL if walking outside vmas)

 * @private:   private data for callbacks' usage

 *

 * (see the comment on walk_page_range() for more details)

 */

struct mm_walk {

	int (*pud_entry)(pud_t *pud, unsigned long addr,

			 unsigned long next, struct mm_walk *walk);

	int (*pmd_entry)(pmd_t *pmd, unsigned long addr,

			 unsigned long next, struct mm_walk *walk);

	int (*pte_entry)(pte_t *pte, unsigned long addr,

			 unsigned long next, struct mm_walk *walk);

	int (*pte_hole)(unsigned long addr, unsigned long next,

			struct mm_walk *walk);

	int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,

			     unsigned long addr, unsigned long next,

			     struct mm_walk *walk);

	int (*test_walk)(unsigned long addr, unsigned long next,

			struct mm_walk *walk);

	struct mm_struct *mm;

	struct vm_area_struct *vma;

	void *private;

};



struct mmu_notifier_range;



int walk_page_range(unsigned long addr, unsigned long end,

		struct mm_walk *walk);

int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);

void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,

		unsigned long end, unsigned long floor, unsigned long ceiling);

int copy_page_range(struct mm_struct *dst, struct mm_struct *src,