pagewalk: separate function pointers from iterator data
The mm_walk structure currently mixed data and code. Split out the
operations vectors into a new mm_walk_ops structure, and while we are
changing the API also declare the mm_walk structure inside the
walk_page_range and walk_page_vma functions.
Based on patch from Linus Torvalds.
Link: https://lore.kernel.org/r/20190828141955.22210-3-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
diff --git a/mm/hmm.c b/mm/hmm.c
index 26916ff..902f5fa 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -852,6 +852,13 @@ void hmm_range_unregister(struct hmm_range *range)
}
EXPORT_SYMBOL(hmm_range_unregister);
+static const struct mm_walk_ops hmm_walk_ops = {
+ .pud_entry = hmm_vma_walk_pud,
+ .pmd_entry = hmm_vma_walk_pmd,
+ .pte_hole = hmm_vma_walk_hole,
+ .hugetlb_entry = hmm_vma_walk_hugetlb_entry,
+};
+
/**
* hmm_range_fault - try to fault some address in a virtual address range
* @range: range being faulted
@@ -887,7 +894,6 @@ long hmm_range_fault(struct hmm_range *range, unsigned int flags)
struct hmm_vma_walk hmm_vma_walk;
struct hmm *hmm = range->hmm;
struct vm_area_struct *vma;
- struct mm_walk mm_walk;
int ret;
lockdep_assert_held(&hmm->mmu_notifier.mm->mmap_sem);
@@ -916,21 +922,14 @@ long hmm_range_fault(struct hmm_range *range, unsigned int flags)
hmm_vma_walk.last = start;
hmm_vma_walk.flags = flags;
hmm_vma_walk.range = range;
- mm_walk.private = &hmm_vma_walk;
end = min(range->end, vma->vm_end);
- mm_walk.vma = vma;
- mm_walk.mm = vma->vm_mm;
- mm_walk.pte_entry = NULL;
- mm_walk.test_walk = NULL;
- mm_walk.hugetlb_entry = NULL;
- mm_walk.pud_entry = hmm_vma_walk_pud;
- mm_walk.pmd_entry = hmm_vma_walk_pmd;
- mm_walk.pte_hole = hmm_vma_walk_hole;
- mm_walk.hugetlb_entry = hmm_vma_walk_hugetlb_entry;
+ walk_page_range(vma->vm_mm, start, end, &hmm_walk_ops,
+ &hmm_vma_walk);
do {
- ret = walk_page_range(start, end, &mm_walk);
+ ret = walk_page_range(vma->vm_mm, start, end,
+ &hmm_walk_ops, &hmm_vma_walk);
start = hmm_vma_walk.last;
/* Keep trying while the range is valid. */
diff --git a/mm/madvise.c b/mm/madvise.c
index 80a78bb1..afe2b01 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -226,19 +226,9 @@ static int swapin_walk_pmd_entry(pmd_t *pmd, unsigned long start,
return 0;
}
-static void force_swapin_readahead(struct vm_area_struct *vma,
- unsigned long start, unsigned long end)
-{
- struct mm_walk walk = {
- .mm = vma->vm_mm,
- .pmd_entry = swapin_walk_pmd_entry,
- .private = vma,
- };
-
- walk_page_range(start, end, &walk);
-
- lru_add_drain(); /* Push any new pages onto the LRU now */
-}
+static const struct mm_walk_ops swapin_walk_ops = {
+ .pmd_entry = swapin_walk_pmd_entry,
+};
static void force_shm_swapin_readahead(struct vm_area_struct *vma,
unsigned long start, unsigned long end,
@@ -280,7 +270,8 @@ static long madvise_willneed(struct vm_area_struct *vma,
*prev = vma;
#ifdef CONFIG_SWAP
if (!file) {
- force_swapin_readahead(vma, start, end);
+ walk_page_range(vma->vm_mm, start, end, &swapin_walk_ops, vma);
+ lru_add_drain(); /* Push any new pages onto the LRU now */
return 0;
}
@@ -441,20 +432,9 @@ static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr,
return 0;
}
-static void madvise_free_page_range(struct mmu_gather *tlb,
- struct vm_area_struct *vma,
- unsigned long addr, unsigned long end)
-{
- struct mm_walk free_walk = {
- .pmd_entry = madvise_free_pte_range,
- .mm = vma->vm_mm,
- .private = tlb,
- };
-
- tlb_start_vma(tlb, vma);
- walk_page_range(addr, end, &free_walk);
- tlb_end_vma(tlb, vma);
-}
+static const struct mm_walk_ops madvise_free_walk_ops = {
+ .pmd_entry = madvise_free_pte_range,
+};
static int madvise_free_single_vma(struct vm_area_struct *vma,
unsigned long start_addr, unsigned long end_addr)
@@ -481,7 +461,10 @@ static int madvise_free_single_vma(struct vm_area_struct *vma,
update_hiwater_rss(mm);
mmu_notifier_invalidate_range_start(&range);
- madvise_free_page_range(&tlb, vma, range.start, range.end);
+ tlb_start_vma(&tlb, vma);
+ walk_page_range(vma->vm_mm, range.start, range.end,
+ &madvise_free_walk_ops, &tlb);
+ tlb_end_vma(&tlb, vma);
mmu_notifier_invalidate_range_end(&range);
tlb_finish_mmu(&tlb, range.start, range.end);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 4c3af5d..9b2516a 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5283,17 +5283,16 @@ static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd,
return 0;
}
+static const struct mm_walk_ops precharge_walk_ops = {
+ .pmd_entry = mem_cgroup_count_precharge_pte_range,
+};
+
static unsigned long mem_cgroup_count_precharge(struct mm_struct *mm)
{
unsigned long precharge;
- struct mm_walk mem_cgroup_count_precharge_walk = {
- .pmd_entry = mem_cgroup_count_precharge_pte_range,
- .mm = mm,
- };
down_read(&mm->mmap_sem);
- walk_page_range(0, mm->highest_vm_end,
- &mem_cgroup_count_precharge_walk);
+ walk_page_range(mm, 0, mm->highest_vm_end, &precharge_walk_ops, NULL);
up_read(&mm->mmap_sem);
precharge = mc.precharge;
@@ -5562,13 +5561,12 @@ static int mem_cgroup_move_charge_pte_range(pmd_t *pmd,
return ret;
}
+static const struct mm_walk_ops charge_walk_ops = {
+ .pmd_entry = mem_cgroup_move_charge_pte_range,
+};
+
static void mem_cgroup_move_charge(void)
{
- struct mm_walk mem_cgroup_move_charge_walk = {
- .pmd_entry = mem_cgroup_move_charge_pte_range,
- .mm = mc.mm,
- };
-
lru_add_drain_all();
/*
* Signal lock_page_memcg() to take the memcg's move_lock
@@ -5594,7 +5592,8 @@ static void mem_cgroup_move_charge(void)
* When we have consumed all precharges and failed in doing
* additional charge, the page walk just aborts.
*/
- walk_page_range(0, mc.mm->highest_vm_end, &mem_cgroup_move_charge_walk);
+ walk_page_range(mc.mm, 0, mc.mm->highest_vm_end, &charge_walk_ops,
+ NULL);
up_read(&mc.mm->mmap_sem);
atomic_dec(&mc.from->moving_account);
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 3a96def..f000771 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -655,6 +655,12 @@ static int queue_pages_test_walk(unsigned long start, unsigned long end,
return 1;
}
+static const struct mm_walk_ops queue_pages_walk_ops = {
+ .hugetlb_entry = queue_pages_hugetlb,
+ .pmd_entry = queue_pages_pte_range,
+ .test_walk = queue_pages_test_walk,
+};
+
/*
* Walk through page tables and collect pages to be migrated.
*
@@ -679,15 +685,8 @@ queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
.nmask = nodes,
.prev = NULL,
};
- struct mm_walk queue_pages_walk = {
- .hugetlb_entry = queue_pages_hugetlb,
- .pmd_entry = queue_pages_pte_range,
- .test_walk = queue_pages_test_walk,
- .mm = mm,
- .private = &qp,
- };
- return walk_page_range(start, end, &queue_pages_walk);
+ return walk_page_range(mm, start, end, &queue_pages_walk_ops, &qp);
}
/*
diff --git a/mm/migrate.c b/mm/migrate.c
index c9c73a3..9f4ed4e 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2320,6 +2320,11 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp,
return 0;
}
+static const struct mm_walk_ops migrate_vma_walk_ops = {
+ .pmd_entry = migrate_vma_collect_pmd,
+ .pte_hole = migrate_vma_collect_hole,
+};
+
/*
* migrate_vma_collect() - collect pages over a range of virtual addresses
* @migrate: migrate struct containing all migration information
@@ -2331,21 +2336,15 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp,
static void migrate_vma_collect(struct migrate_vma *migrate)
{
struct mmu_notifier_range range;
- struct mm_walk mm_walk = {
- .pmd_entry = migrate_vma_collect_pmd,
- .pte_hole = migrate_vma_collect_hole,
- .vma = migrate->vma,
- .mm = migrate->vma->vm_mm,
- .private = migrate,
- };
- mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL, mm_walk.mm,
- migrate->start,
- migrate->end);
+ mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL,
+ migrate->vma->vm_mm, migrate->start, migrate->end);
mmu_notifier_invalidate_range_start(&range);
- walk_page_range(migrate->start, migrate->end, &mm_walk);
- mmu_notifier_invalidate_range_end(&range);
+ walk_page_range(migrate->vma->vm_mm, migrate->start, migrate->end,
+ &migrate_vma_walk_ops, migrate);
+
+ mmu_notifier_invalidate_range_end(&range);
migrate->end = migrate->start + (migrate->npages << PAGE_SHIFT);
}
diff --git a/mm/mincore.c b/mm/mincore.c
index 3b051b6..f9a9dbe 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -193,6 +193,12 @@ static inline bool can_do_mincore(struct vm_area_struct *vma)
inode_permission(file_inode(vma->vm_file), MAY_WRITE) == 0;
}
+static const struct mm_walk_ops mincore_walk_ops = {
+ .pmd_entry = mincore_pte_range,
+ .pte_hole = mincore_unmapped_range,
+ .hugetlb_entry = mincore_hugetlb,
+};
+
/*
* Do a chunk of "sys_mincore()". We've already checked
* all the arguments, we hold the mmap semaphore: we should
@@ -203,12 +209,6 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
struct vm_area_struct *vma;
unsigned long end;
int err;
- struct mm_walk mincore_walk = {
- .pmd_entry = mincore_pte_range,
- .pte_hole = mincore_unmapped_range,
- .hugetlb_entry = mincore_hugetlb,
- .private = vec,
- };
vma = find_vma(current->mm, addr);
if (!vma || addr < vma->vm_start)
@@ -219,8 +219,7 @@ static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *v
memset(vec, 1, pages);
return pages;
}
- mincore_walk.mm = vma->vm_mm;
- err = walk_page_range(addr, end, &mincore_walk);
+ err = walk_page_range(vma->vm_mm, addr, end, &mincore_walk_ops, vec);
if (err < 0)
return err;
return (end - addr) >> PAGE_SHIFT;
diff --git a/mm/mprotect.c b/mm/mprotect.c
index cc73318..675e5d3 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -329,20 +329,11 @@ static int prot_none_test(unsigned long addr, unsigned long next,
return 0;
}
-static int prot_none_walk(struct vm_area_struct *vma, unsigned long start,
- unsigned long end, unsigned long newflags)
-{
- pgprot_t new_pgprot = vm_get_page_prot(newflags);
- struct mm_walk prot_none_walk = {
- .pte_entry = prot_none_pte_entry,
- .hugetlb_entry = prot_none_hugetlb_entry,
- .test_walk = prot_none_test,
- .mm = current->mm,
- .private = &new_pgprot,
- };
-
- return walk_page_range(start, end, &prot_none_walk);
-}
+static const struct mm_walk_ops prot_none_walk_ops = {
+ .pte_entry = prot_none_pte_entry,
+ .hugetlb_entry = prot_none_hugetlb_entry,
+ .test_walk = prot_none_test,
+};
int
mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
@@ -369,7 +360,10 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
if (arch_has_pfn_modify_check() &&
(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) &&
(newflags & (VM_READ|VM_WRITE|VM_EXEC)) == 0) {
- error = prot_none_walk(vma, start, end, newflags);
+ pgprot_t new_pgprot = vm_get_page_prot(newflags);
+
+ error = walk_page_range(current->mm, start, end,
+ &prot_none_walk_ops, &new_pgprot);
if (error)
return error;
}
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 8a92a96..b8762b6 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -9,10 +9,11 @@ static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
{
pte_t *pte;
int err = 0;
+ const struct mm_walk_ops *ops = walk->ops;
pte = pte_offset_map(pmd, addr);
for (;;) {
- err = walk->pte_entry(pte, addr, addr + PAGE_SIZE, walk);
+ err = ops->pte_entry(pte, addr, addr + PAGE_SIZE, walk);
if (err)
break;
addr += PAGE_SIZE;
@@ -30,6 +31,7 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
{
pmd_t *pmd;
unsigned long next;
+ const struct mm_walk_ops *ops = walk->ops;
int err = 0;
pmd = pmd_offset(pud, addr);
@@ -37,8 +39,8 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
again:
next = pmd_addr_end(addr, end);
if (pmd_none(*pmd) || !walk->vma) {
- if (walk->pte_hole)
- err = walk->pte_hole(addr, next, walk);
+ if (ops->pte_hole)
+ err = ops->pte_hole(addr, next, walk);
if (err)
break;
continue;
@@ -47,8 +49,8 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
* This implies that each ->pmd_entry() handler
* needs to know about pmd_trans_huge() pmds
*/
- if (walk->pmd_entry)
- err = walk->pmd_entry(pmd, addr, next, walk);
+ if (ops->pmd_entry)
+ err = ops->pmd_entry(pmd, addr, next, walk);
if (err)
break;
@@ -56,7 +58,7 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
* Check this here so we only break down trans_huge
* pages when we _need_ to
*/
- if (!walk->pte_entry)
+ if (!ops->pte_entry)
continue;
split_huge_pmd(walk->vma, pmd, addr);
@@ -75,6 +77,7 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
{
pud_t *pud;
unsigned long next;
+ const struct mm_walk_ops *ops = walk->ops;
int err = 0;
pud = pud_offset(p4d, addr);
@@ -82,18 +85,18 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
again:
next = pud_addr_end(addr, end);
if (pud_none(*pud) || !walk->vma) {
- if (walk->pte_hole)
- err = walk->pte_hole(addr, next, walk);
+ if (ops->pte_hole)
+ err = ops->pte_hole(addr, next, walk);
if (err)
break;
continue;
}
- if (walk->pud_entry) {
+ if (ops->pud_entry) {
spinlock_t *ptl = pud_trans_huge_lock(pud, walk->vma);
if (ptl) {
- err = walk->pud_entry(pud, addr, next, walk);
+ err = ops->pud_entry(pud, addr, next, walk);
spin_unlock(ptl);
if (err)
break;
@@ -105,7 +108,7 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end,
if (pud_none(*pud))
goto again;
- if (walk->pmd_entry || walk->pte_entry)
+ if (ops->pmd_entry || ops->pte_entry)
err = walk_pmd_range(pud, addr, next, walk);
if (err)
break;
@@ -119,19 +122,20 @@ static int walk_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end,
{
p4d_t *p4d;
unsigned long next;
+ const struct mm_walk_ops *ops = walk->ops;
int err = 0;
p4d = p4d_offset(pgd, addr);
do {
next = p4d_addr_end(addr, end);
if (p4d_none_or_clear_bad(p4d)) {
- if (walk->pte_hole)
- err = walk->pte_hole(addr, next, walk);
+ if (ops->pte_hole)
+ err = ops->pte_hole(addr, next, walk);
if (err)
break;
continue;
}
- if (walk->pmd_entry || walk->pte_entry)
+ if (ops->pmd_entry || ops->pte_entry)
err = walk_pud_range(p4d, addr, next, walk);
if (err)
break;
@@ -145,19 +149,20 @@ static int walk_pgd_range(unsigned long addr, unsigned long end,
{
pgd_t *pgd;
unsigned long next;
+ const struct mm_walk_ops *ops = walk->ops;
int err = 0;
pgd = pgd_offset(walk->mm, addr);
do {
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd)) {
- if (walk->pte_hole)
- err = walk->pte_hole(addr, next, walk);
+ if (ops->pte_hole)
+ err = ops->pte_hole(addr, next, walk);
if (err)
break;
continue;
}
- if (walk->pmd_entry || walk->pte_entry)
+ if (ops->pmd_entry || ops->pte_entry)
err = walk_p4d_range(pgd, addr, next, walk);
if (err)
break;
@@ -183,6 +188,7 @@ static int walk_hugetlb_range(unsigned long addr, unsigned long end,
unsigned long hmask = huge_page_mask(h);
unsigned long sz = huge_page_size(h);
pte_t *pte;
+ const struct mm_walk_ops *ops = walk->ops;
int err = 0;
do {
@@ -190,9 +196,9 @@ static int walk_hugetlb_range(unsigned long addr, unsigned long end,
pte = huge_pte_offset(walk->mm, addr & hmask, sz);
if (pte)
- err = walk->hugetlb_entry(pte, hmask, addr, next, walk);
- else if (walk->pte_hole)
- err = walk->pte_hole(addr, next, walk);
+ err = ops->hugetlb_entry(pte, hmask, addr, next, walk);
+ else if (ops->pte_hole)
+ err = ops->pte_hole(addr, next, walk);
if (err)
break;
@@ -220,9 +226,10 @@ static int walk_page_test(unsigned long start, unsigned long end,
struct mm_walk *walk)
{
struct vm_area_struct *vma = walk->vma;
+ const struct mm_walk_ops *ops = walk->ops;
- if (walk->test_walk)
- return walk->test_walk(start, end, walk);
+ if (ops->test_walk)
+ return ops->test_walk(start, end, walk);
/*
* vma(VM_PFNMAP) doesn't have any valid struct pages behind VM_PFNMAP
@@ -234,8 +241,8 @@ static int walk_page_test(unsigned long start, unsigned long end,
*/
if (vma->vm_flags & VM_PFNMAP) {
int err = 1;
- if (walk->pte_hole)
- err = walk->pte_hole(start, end, walk);
+ if (ops->pte_hole)
+ err = ops->pte_hole(start, end, walk);
return err ? err : 1;
}
return 0;
@@ -248,7 +255,7 @@ static int __walk_page_range(unsigned long start, unsigned long end,
struct vm_area_struct *vma = walk->vma;
if (vma && is_vm_hugetlb_page(vma)) {
- if (walk->hugetlb_entry)
+ if (walk->ops->hugetlb_entry)
err = walk_hugetlb_range(start, end, walk);
} else
err = walk_pgd_range(start, end, walk);
@@ -258,11 +265,13 @@ static int __walk_page_range(unsigned long start, unsigned long end,
/**
* walk_page_range - walk page table with caller specific callbacks
- * @start: start address of the virtual address range
- * @end: end address of the virtual address range
- * @walk: mm_walk structure defining the callbacks and the target address space
+ * @mm: mm_struct representing the target process of page table walk
+ * @start: start address of the virtual address range
+ * @end: end address of the virtual address range
+ * @ops: operation to call during the walk
+ * @private: private data for callbacks' usage
*
- * Recursively walk the page table tree of the process represented by @walk->mm
+ * Recursively walk the page table tree of the process represented by @mm
* within the virtual address range [@start, @end). During walking, we can do
* some caller-specific works for each entry, by setting up pmd_entry(),
* pte_entry(), and/or hugetlb_entry(). If you don't set up for some of these
@@ -278,47 +287,52 @@ static int __walk_page_range(unsigned long start, unsigned long end,
*
* Before starting to walk page table, some callers want to check whether
* they really want to walk over the current vma, typically by checking
- * its vm_flags. walk_page_test() and @walk->test_walk() are used for this
+ * its vm_flags. walk_page_test() and @ops->test_walk() are used for this
* purpose.
*
* struct mm_walk keeps current values of some common data like vma and pmd,
* which are useful for the access from callbacks. If you want to pass some
- * caller-specific data to callbacks, @walk->private should be helpful.
+ * caller-specific data to callbacks, @private should be helpful.
*
* Locking:
- * Callers of walk_page_range() and walk_page_vma() should hold
- * @walk->mm->mmap_sem, because these function traverse vma list and/or
- * access to vma's data.
+ * Callers of walk_page_range() and walk_page_vma() should hold @mm->mmap_sem,
+ * because these function traverse vma list and/or access to vma's data.
*/
-int walk_page_range(unsigned long start, unsigned long end,
- struct mm_walk *walk)
+int walk_page_range(struct mm_struct *mm, unsigned long start,
+ unsigned long end, const struct mm_walk_ops *ops,
+ void *private)
{
int err = 0;
unsigned long next;
struct vm_area_struct *vma;
+ struct mm_walk walk = {
+ .ops = ops,
+ .mm = mm,
+ .private = private,
+ };
if (start >= end)
return -EINVAL;
- if (!walk->mm)
+ if (!walk.mm)
return -EINVAL;
- VM_BUG_ON_MM(!rwsem_is_locked(&walk->mm->mmap_sem), walk->mm);
+ VM_BUG_ON_MM(!rwsem_is_locked(&walk.mm->mmap_sem), walk.mm);
- vma = find_vma(walk->mm, start);
+ vma = find_vma(walk.mm, start);
do {
if (!vma) { /* after the last vma */
- walk->vma = NULL;
+ walk.vma = NULL;
next = end;
} else if (start < vma->vm_start) { /* outside vma */
- walk->vma = NULL;
+ walk.vma = NULL;
next = min(end, vma->vm_start);
} else { /* inside vma */
- walk->vma = vma;
+ walk.vma = vma;
next = min(end, vma->vm_end);
vma = vma->vm_next;
- err = walk_page_test(start, next, walk);
+ err = walk_page_test(start, next, &walk);
if (err > 0) {
/*
* positive return values are purely for
@@ -331,28 +345,34 @@ int walk_page_range(unsigned long start, unsigned long end,
if (err < 0)
break;
}
- if (walk->vma || walk->pte_hole)
- err = __walk_page_range(start, next, walk);
+ if (walk.vma || walk.ops->pte_hole)
+ err = __walk_page_range(start, next, &walk);
if (err)
break;
} while (start = next, start < end);
return err;
}
-int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk)
+int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops,
+ void *private)
{
+ struct mm_walk walk = {
+ .ops = ops,
+ .mm = vma->vm_mm,
+ .vma = vma,
+ .private = private,
+ };
int err;
- if (!walk->mm)
+ if (!walk.mm)
return -EINVAL;
- VM_BUG_ON(!rwsem_is_locked(&walk->mm->mmap_sem));
- VM_BUG_ON(!vma);
- walk->vma = vma;
- err = walk_page_test(vma->vm_start, vma->vm_end, walk);
+ VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
+
+ err = walk_page_test(vma->vm_start, vma->vm_end, &walk);
if (err > 0)
return 0;
if (err < 0)
return err;
- return __walk_page_range(vma->vm_start, vma->vm_end, walk);
+ return __walk_page_range(vma->vm_start, vma->vm_end, &walk);
}