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Subject[PATCH -mm v2 06/11] pagewalk: add size to struct mm_walk
Date
This variable is helpful if we try to share the callback function between
multiple slots (for example between pte_entry() and pmd_entry()) as done
in later patches.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
---
include/linux/mm.h | 2 ++
mm/pagewalk.c | 5 +++++
2 files changed, 7 insertions(+)

diff --git mmotm-2014-05-21-16-57.orig/include/linux/mm.h mmotm-2014-05-21-16-57/include/linux/mm.h
index 0a20674c84e2..cbe17d9cbd7f 100644
--- mmotm-2014-05-21-16-57.orig/include/linux/mm.h
+++ mmotm-2014-05-21-16-57/include/linux/mm.h
@@ -1108,6 +1108,7 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
* @vma: vma currently walked
* @pmd: current pmd entry
* @ptl: page table lock associated with current entry
+ * @size: size of current entry
* @private: private data for callbacks' use
*
* (see the comment on walk_page_range() for more details)
@@ -1127,6 +1128,7 @@ struct mm_walk {
struct vm_area_struct *vma;
pmd_t *pmd;
spinlock_t *ptl;
+ long size;
void *private;
};

diff --git mmotm-2014-05-21-16-57.orig/mm/pagewalk.c mmotm-2014-05-21-16-57/mm/pagewalk.c
index 61d6bd9545d6..b46c8882c643 100644
--- mmotm-2014-05-21-16-57.orig/mm/pagewalk.c
+++ mmotm-2014-05-21-16-57/mm/pagewalk.c
@@ -11,6 +11,7 @@ static int walk_pte_range(pmd_t *pmd, unsigned long addr,
pte_t *orig_pte;
int err = 0;

+ walk->size = PAGE_SIZE;
walk->pmd = pmd;
orig_pte = pte = pte_offset_map_lock(mm, pmd, addr, &walk->ptl);
do {
@@ -42,6 +43,7 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr,
unsigned long next;
int err = 0;

+ walk->size = PMD_SIZE;
pmd = pmd_offset(pud, addr);
do {
again:
@@ -97,6 +99,7 @@ static int walk_pud_range(pgd_t *pgd, unsigned long addr,
unsigned long next;
int err = 0;

+ walk->size = PUD_SIZE;
pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
@@ -126,6 +129,7 @@ static int walk_pgd_range(unsigned long addr, unsigned long end,
unsigned long next;
int err = 0;

+ walk->size = PGDIR_SIZE;
pgd = pgd_offset(walk->mm, addr);
do {
next = pgd_addr_end(addr, end);
@@ -167,6 +171,7 @@ static int walk_hugetlb_range(unsigned long addr, unsigned long end,
pte_t *pte;
int err = 0;

+ walk->size = huge_page_size(h);
do {
next = hugetlb_entry_end(h, addr, end);
pte = huge_pte_offset(walk->mm, addr & hmask);
--
1.9.3


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