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authorMichel Lespinasse <walken@google.com>2012-10-08 16:31:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:22:39 +0900
commit6b2dbba8b6ac4df26f72eda1e5ea7bab9f950e08 (patch)
tree422ed8d7ac2fe45069f20cfba84a9a097bf444af /kernel
parentfff3fd8a1210a165252cd7cd01206da7a90d3a06 (diff)
mm: replace vma prio_tree with an interval tree
Implement an interval tree as a replacement for the VMA prio_tree. The algorithms are similar to lib/interval_tree.c; however that code can't be directly reused as the interval endpoints are not explicitly stored in the VMA. So instead, the common algorithm is moved into a template and the details (node type, how to get interval endpoints from the node, etc) are filled in using the C preprocessor. Once the interval tree functions are available, using them as a replacement to the VMA prio tree is a relatively simple, mechanical job. Signed-off-by: Michel Lespinasse <walken@google.com> Cc: Rik van Riel <riel@redhat.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/uprobes.c3
-rw-r--r--kernel/fork.c2
2 files changed, 2 insertions, 3 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 912ef48d28ab..1d9c0a985960 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -735,7 +735,6 @@ static struct map_info *
build_map_info(struct address_space *mapping, loff_t offset, bool is_register)
{
unsigned long pgoff = offset >> PAGE_SHIFT;
- struct prio_tree_iter iter;
struct vm_area_struct *vma;
struct map_info *curr = NULL;
struct map_info *prev = NULL;
@@ -744,7 +743,7 @@ build_map_info(struct address_space *mapping, loff_t offset, bool is_register)
again:
mutex_lock(&mapping->i_mmap_mutex);
- vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) {
+ vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
if (!valid_vma(vma, is_register))
continue;
diff --git a/kernel/fork.c b/kernel/fork.c
index 972762e01024..90dace52715e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -423,7 +423,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
mapping->i_mmap_writable++;
flush_dcache_mmap_lock(mapping);
/* insert tmp into the share list, just after mpnt */
- vma_prio_tree_add(tmp, mpnt);
+ vma_interval_tree_add(tmp, mpnt, mapping);
flush_dcache_mmap_unlock(mapping);
mutex_unlock(&mapping->i_mmap_mutex);
}