[PATCH -next] mm: introduce vma_interval_tree_foreach_stab()

From: Davidlohr Bueso
Date: Thu Sep 05 2019 - 00:59:52 EST

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This documents better the nature of the stab lookup/query.

In addition, this is a step that will make the conversion
of interval tree nodes from [a,b] to [a,b[ easier to review.

For symmetry with vma_interval_tree, the anon equivalent is
also introduced, albeit a single user. This patch does not
change any semantics.

Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
---
arch/arm/mm/fault-armv.c | 2 +-
arch/arm/mm/flush.c | 2 +-
arch/nios2/mm/cacheflush.c | 2 +-
arch/parisc/kernel/cache.c | 2 +-
fs/dax.c | 2 +-
include/linux/mm.h | 6 ++++++
kernel/events/uprobes.c | 2 +-
mm/hugetlb.c | 4 ++--
mm/khugepaged.c | 2 +-
mm/memory-failure.c | 6 ++----
10 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c
index ae857f41f68d..85bb69f1decb 100644
--- a/arch/arm/mm/fault-armv.c
+++ b/arch/arm/mm/fault-armv.c
@@ -143,7 +143,7 @@ make_coherent(struct address_space *mapping, struct vm_area_struct *vma,
* cache coherency.
*/
flush_dcache_mmap_lock(mapping);
- vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
+ vma_interval_tree_foreach_stab(mpnt, &mapping->i_mmap, pgoff) {
/*
* If this VMA is not in our MM, we can ignore it.
* Note that we intentionally mask out the VMA
diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c
index 6d89db7895d1..b04384406c0f 100644
--- a/arch/arm/mm/flush.c
+++ b/arch/arm/mm/flush.c
@@ -249,7 +249,7 @@ static void __flush_dcache_aliases(struct address_space *mapping, struct page *p
pgoff = page->index;

flush_dcache_mmap_lock(mapping);
- vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
+ vma_interval_tree_foreach_stab(mpnt, &mapping->i_mmap, pgoff) {
unsigned long offset;

/*
diff --git a/arch/nios2/mm/cacheflush.c b/arch/nios2/mm/cacheflush.c
index 65de1bd6a760..8abe26b8e29d 100644
--- a/arch/nios2/mm/cacheflush.c
+++ b/arch/nios2/mm/cacheflush.c
@@ -79,7 +79,7 @@ static void flush_aliases(struct address_space *mapping, struct page *page)
pgoff = page->index;

flush_dcache_mmap_lock(mapping);
- vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
+ vma_interval_tree_foreach_stab(mpnt, &mapping->i_mmap, pgoff) {
unsigned long offset;

if (mpnt->vm_mm != mm)
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index a82b3eaa5398..c5f8aab749c1 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -348,7 +348,7 @@ void flush_dcache_page(struct page *page)
* to flush one address here for them all to become coherent */

flush_dcache_mmap_lock(mapping);
- vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
+ vma_interval_tree_foreach_stab(mpnt, &mapping->i_mmap, pgoff) {
offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
addr = mpnt->vm_start + offset;

diff --git a/fs/dax.c b/fs/dax.c
index 6bf81f931de3..f24c035defb7 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -781,7 +781,7 @@ static void dax_entry_mkclean(struct address_space *mapping, pgoff_t index,
spinlock_t *ptl;

i_mmap_lock_read(mapping);
- vma_interval_tree_foreach(vma, &mapping->i_mmap, index, index) {
+ vma_interval_tree_foreach_stab(vma, &mapping->i_mmap, index) {
struct mmu_notifier_range range;
unsigned long address;

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 66f296181bcc..14c5eb514bfe 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2244,6 +2244,9 @@ struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node,
for (vma = vma_interval_tree_iter_first(root, start, last); \
vma; vma = vma_interval_tree_iter_next(vma, start, last))

+#define vma_interval_tree_foreach_stab(vma, root, start) \
+ vma_interval_tree_foreach(vma, root, start, start)
+
void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
struct rb_root_cached *root);
void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
@@ -2261,6 +2264,9 @@ void anon_vma_interval_tree_verify(struct anon_vma_chain *node);
for (avc = anon_vma_interval_tree_iter_first(root, start, last); \
avc; avc = anon_vma_interval_tree_iter_next(avc, start, last))

+#define anon_vma_interval_tree_foreach_stab(vma, root, start) \
+ anon_vma_interval_tree_foreach(vma, root, start, start)
+
/* mmap.c */
extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
extern int __vma_adjust(struct vm_area_struct *vma, unsigned long start,
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 94d38a39d72e..6a70dbe0b4b2 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -975,7 +975,7 @@ build_map_info(struct address_space *mapping, loff_t offset, bool is_register)

again:
i_mmap_lock_read(mapping);
- vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
+ vma_interval_tree_foreach_stab(vma, &mapping->i_mmap, pgoff) {
if (!valid_vma(vma, is_register))
continue;

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index ef37c85423a5..1a6b133ca66d 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3643,7 +3643,7 @@ static void unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
* __unmap_hugepage_range() is called as the lock is already held
*/
i_mmap_lock_write(mapping);
- vma_interval_tree_foreach(iter_vma, &mapping->i_mmap, pgoff, pgoff) {
+ vma_interval_tree_foreach_stab(iter_vma, &mapping->i_mmap, pgoff) {
/* Do not unmap the current VMA */
if (iter_vma == vma)
continue;
@@ -4844,7 +4844,7 @@ pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
return (pte_t *)pmd_alloc(mm, pud, addr);

i_mmap_lock_write(mapping);
- vma_interval_tree_foreach(svma, &mapping->i_mmap, idx, idx) {
+ vma_interval_tree_foreach_stab(svma, &mapping->i_mmap, idx) {
if (svma == vma)
continue;

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 00cec6a127aa..a5536e7c4d4c 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1420,7 +1420,7 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
pmd_t *pmd, _pmd;

i_mmap_lock_write(mapping);
- vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
+ vma_interval_tree_foreach_stab(vma, &mapping->i_mmap, pgoff) {
/*
* Check vma->anon_vma to exclude MAP_PRIVATE mappings that
* got written to. These VMAs are likely not worth investing
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 7ef849da8278..79934fd00146 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -451,8 +451,7 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill,

if (!t)
continue;
- anon_vma_interval_tree_foreach(vmac, &av->rb_root,
- pgoff, pgoff) {
+ anon_vma_interval_tree_foreach_stab(vmac, &av->rb_root, pgoff) {
vma = vmac->vma;
if (!page_mapped_in_vma(page, vma))
continue;
@@ -482,8 +481,7 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill,

if (!t)
continue;
- vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff,
- pgoff) {
+ vma_interval_tree_foreach_stab(vma, &mapping->i_mmap, pgoff) {
/*
* Send early kill signal to tasks where a vma covers
* the page but the corrupted page is not necessarily
--
2.16.4

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