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Subject[PATCH v2 2/3] augmented rbtree: add new RB_DECLARE_CALLBACKS_MAX macro
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Add RB_DECLARE_CALLBACKS_MAX, which generates augmented rbtree callbacks
for the case where the augmented value is a scalar whose definition
follows a max(f(node)) pattern. This actually covers all present uses
of RB_DECLARE_CALLBACKS, and saves some (source) code duplication in the
various RBCOMPUTE function definitions.

Signed-off-by: Michel Lespinasse <walken@google.com>
---
arch/x86/mm/pat_rbtree.c | 19 +++-----------
drivers/block/drbd/drbd_interval.c | 29 +++------------------
include/linux/interval_tree_generic.h | 22 ++--------------
include/linux/rbtree_augmented.h | 36 +++++++++++++++++++++++++-
lib/rbtree_test.c | 22 +++-------------
mm/mmap.c | 29 +++++++++++++--------
tools/include/linux/rbtree_augmented.h | 36 +++++++++++++++++++++++++-
7 files changed, 99 insertions(+), 94 deletions(-)

diff --git a/arch/x86/mm/pat_rbtree.c b/arch/x86/mm/pat_rbtree.c
index fa16036fa592..2afad8e869fc 100644
--- a/arch/x86/mm/pat_rbtree.c
+++ b/arch/x86/mm/pat_rbtree.c
@@ -54,23 +54,10 @@ static u64 get_subtree_max_end(struct rb_node *node)
return ret;
}

-static u64 compute_subtree_max_end(struct memtype *data)
-{
- u64 max_end = data->end, child_max_end;
-
- child_max_end = get_subtree_max_end(data->rb.rb_right);
- if (child_max_end > max_end)
- max_end = child_max_end;
-
- child_max_end = get_subtree_max_end(data->rb.rb_left);
- if (child_max_end > max_end)
- max_end = child_max_end;
-
- return max_end;
-}
+#define NODE_END(node) ((node)->end)

-RB_DECLARE_CALLBACKS(static, memtype_rb_augment_cb, struct memtype, rb,
- u64, subtree_max_end, compute_subtree_max_end)
+RB_DECLARE_CALLBACKS_MAX(struct memtype, rb, u64, subtree_max_end, NODE_END,
+ static, memtype_rb_augment_cb)

/* Find the first (lowest start addr) overlapping range from rb tree */
static struct memtype *memtype_rb_lowest_match(struct rb_root *root,
diff --git a/drivers/block/drbd/drbd_interval.c b/drivers/block/drbd/drbd_interval.c
index c58986556161..3a507a1fd1e3 100644
--- a/drivers/block/drbd/drbd_interval.c
+++ b/drivers/block/drbd/drbd_interval.c
@@ -13,33 +13,10 @@ sector_t interval_end(struct rb_node *node)
return this->end;
}

-/**
- * compute_subtree_last - compute end of @node
- *
- * The end of an interval is the highest (start + (size >> 9)) value of this
- * node and of its children. Called for @node and its parents whenever the end
- * may have changed.
- */
-static inline sector_t
-compute_subtree_last(struct drbd_interval *node)
-{
- sector_t max = node->sector + (node->size >> 9);
-
- if (node->rb.rb_left) {
- sector_t left = interval_end(node->rb.rb_left);
- if (left > max)
- max = left;
- }
- if (node->rb.rb_right) {
- sector_t right = interval_end(node->rb.rb_right);
- if (right > max)
- max = right;
- }
- return max;
-}
+#define NODE_END(node) ((node)->sector + ((node)->size >> 9))

-RB_DECLARE_CALLBACKS(static, augment_callbacks, struct drbd_interval, rb,
- sector_t, end, compute_subtree_last);
+RB_DECLARE_CALLBACKS_MAX(struct drbd_interval, rb, sector_t, end, NODE_END,
+ static, augment_callbacks);

/**
* drbd_insert_interval - insert a new interval into a tree
diff --git a/include/linux/interval_tree_generic.h b/include/linux/interval_tree_generic.h
index 1f97ce26cccc..8a9fcfb25157 100644
--- a/include/linux/interval_tree_generic.h
+++ b/include/linux/interval_tree_generic.h
@@ -42,26 +42,8 @@
\
/* Callbacks for augmented rbtree insert and remove */ \
\
-static inline ITTYPE ITPREFIX ## _compute_subtree_last(ITSTRUCT *node) \
-{ \
- ITTYPE max = ITLAST(node), subtree_last; \
- if (node->ITRB.rb_left) { \
- subtree_last = rb_entry(node->ITRB.rb_left, \
- ITSTRUCT, ITRB)->ITSUBTREE; \
- if (max < subtree_last) \
- max = subtree_last; \
- } \
- if (node->ITRB.rb_right) { \
- subtree_last = rb_entry(node->ITRB.rb_right, \
- ITSTRUCT, ITRB)->ITSUBTREE; \
- if (max < subtree_last) \
- max = subtree_last; \
- } \
- return max; \
-} \
- \
-RB_DECLARE_CALLBACKS(static, ITPREFIX ## _augment, ITSTRUCT, ITRB, \
- ITTYPE, ITSUBTREE, ITPREFIX ## _compute_subtree_last) \
+RB_DECLARE_CALLBACKS_MAX(ITSTRUCT, ITRB, ITTYPE, ITSUBTREE, ITLAST, \
+ static, ITPREFIX ## _augment) \
\
/* Insert / remove interval nodes from the tree */ \
\
diff --git a/include/linux/rbtree_augmented.h b/include/linux/rbtree_augmented.h
index 5923495276e0..a471702c01e7 100644
--- a/include/linux/rbtree_augmented.h
+++ b/include/linux/rbtree_augmented.h
@@ -73,7 +73,7 @@ rb_insert_augmented_cached(struct rb_node *node,
}

/*
- * Template for declaring augmented rbtree callbacks
+ * Template for declaring augmented rbtree callbacks (generic case)
*
* RBSTATIC: 'static' or empty
* RBNAME: name of the rb_augment_callbacks structure
@@ -119,6 +119,40 @@ RBSTATIC const struct rb_augment_callbacks RBNAME = { \
.rotate = RBNAME ## _rotate \
};

+/*
+ * Template for declaring augmented rbtree callbacks,
+ * computing RBAUGMENTED scalar as max(RBCOMPUTE(node)) for all subtree nodes.
+ *
+ * RBSTRUCT: struct type of the tree nodes
+ * RBFIELD: name of struct rb_node field within RBSTRUCT
+ * RBTYPE: type of the RBAUGMENTED field
+ * RBAUGMENTED: name of RBTYPE field within RBSTRUCT holding data for subtree
+ * RBCOMPUTE: name of function that returns the per-node RBTYPE scalar
+ * RBSTATIC: 'static' or empty
+ * RBNAME: name of the rb_augment_callbacks structure
+ */
+
+#define RB_DECLARE_CALLBACKS_MAX(RBSTRUCT, RBFIELD, RBTYPE, RBAUGMENTED, \
+ RBCOMPUTE, RBSTATIC, RBNAME) \
+static inline RBTYPE RBNAME ## _compute_max(RBSTRUCT *node) \
+{ \
+ RBSTRUCT *child; \
+ RBTYPE max = RBCOMPUTE(node); \
+ if (node->RBFIELD.rb_left) { \
+ child = rb_entry(node->RBFIELD.rb_left, RBSTRUCT, RBFIELD); \
+ if (child->RBAUGMENTED > max) \
+ max = child->RBAUGMENTED; \
+ } \
+ if (node->RBFIELD.rb_right) { \
+ child = rb_entry(node->RBFIELD.rb_right, RBSTRUCT, RBFIELD); \
+ if (child->RBAUGMENTED > max) \
+ max = child->RBAUGMENTED; \
+ } \
+ return max; \
+} \
+RB_DECLARE_CALLBACKS(RBSTATIC, RBNAME, RBSTRUCT, RBFIELD, \
+ RBTYPE, RBAUGMENTED, RBNAME ## _compute_max)
+

#define RB_RED 0
#define RB_BLACK 1
diff --git a/lib/rbtree_test.c b/lib/rbtree_test.c
index b7055b2a07d3..b876f8e73897 100644
--- a/lib/rbtree_test.c
+++ b/lib/rbtree_test.c
@@ -76,26 +76,10 @@ static inline void erase_cached(struct test_node *node, struct rb_root_cached *r
}


-static inline u32 augment_recompute(struct test_node *node)
-{
- u32 max = node->val, child_augmented;
- if (node->rb.rb_left) {
- child_augmented = rb_entry(node->rb.rb_left, struct test_node,
- rb)->augmented;
- if (max < child_augmented)
- max = child_augmented;
- }
- if (node->rb.rb_right) {
- child_augmented = rb_entry(node->rb.rb_right, struct test_node,
- rb)->augmented;
- if (max < child_augmented)
- max = child_augmented;
- }
- return max;
-}
+#define NODE_VAL(node) ((node)->val)

-RB_DECLARE_CALLBACKS(static, augment_callbacks, struct test_node, rb,
- u32, augmented, augment_recompute)
+RB_DECLARE_CALLBACKS_MAX(struct test_node, rb, u32, augmented, NODE_VAL,
+ static, augment_callbacks)

static void insert_augmented(struct test_node *node,
struct rb_root_cached *root)
diff --git a/mm/mmap.c b/mm/mmap.c
index bd7b9f293b39..cd293c794975 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -288,9 +288,9 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
return retval;
}

-static long vma_compute_subtree_gap(struct vm_area_struct *vma)
+static inline unsigned long vma_compute_gap(struct vm_area_struct *vma)
{
- unsigned long max, prev_end, subtree_gap;
+ unsigned long gap, prev_end;

/*
* Note: in the rare case of a VM_GROWSDOWN above a VM_GROWSUP, we
@@ -298,14 +298,21 @@ static long vma_compute_subtree_gap(struct vm_area_struct *vma)
* an unmapped area; whereas when expanding we only require one.
* That's a little inconsistent, but keeps the code here simpler.
*/
- max = vm_start_gap(vma);
+ gap = vm_start_gap(vma);
if (vma->vm_prev) {
prev_end = vm_end_gap(vma->vm_prev);
- if (max > prev_end)
- max -= prev_end;
+ if (gap > prev_end)
+ gap -= prev_end;
else
- max = 0;
+ gap = 0;
}
+ return gap;
+}
+
+#ifdef CONFIG_DEBUG_VM_RB
+static unsigned long vma_compute_subtree_gap(struct vm_area_struct *vma)
+{
+ unsigned long max = vma_compute_gap(vma), subtree_gap;
if (vma->vm_rb.rb_left) {
subtree_gap = rb_entry(vma->vm_rb.rb_left,
struct vm_area_struct, vm_rb)->rb_subtree_gap;
@@ -321,7 +328,6 @@ static long vma_compute_subtree_gap(struct vm_area_struct *vma)
return max;
}

-#ifdef CONFIG_DEBUG_VM_RB
static int browse_rb(struct mm_struct *mm)
{
struct rb_root *root = &mm->mm_rb;
@@ -427,8 +433,9 @@ static void validate_mm(struct mm_struct *mm)
#define validate_mm(mm) do { } while (0)
#endif

-RB_DECLARE_CALLBACKS(static, vma_gap_callbacks, struct vm_area_struct, vm_rb,
- unsigned long, rb_subtree_gap, vma_compute_subtree_gap)
+RB_DECLARE_CALLBACKS_MAX(struct vm_area_struct, vm_rb,
+ unsigned long, rb_subtree_gap, vma_compute_gap,
+ static, vma_gap_callbacks)

/*
* Update augmented rbtree rb_subtree_gap values after vma->vm_start or
@@ -438,8 +445,8 @@ RB_DECLARE_CALLBACKS(static, vma_gap_callbacks, struct vm_area_struct, vm_rb,
static void vma_gap_update(struct vm_area_struct *vma)
{
/*
- * As it turns out, RB_DECLARE_CALLBACKS() already created a callback
- * function that does exactly what we want.
+ * As it turns out, RB_DECLARE_CALLBACKS_MAX() already created
+ * a callback function that does exactly what we want.
*/
vma_gap_callbacks_propagate(&vma->vm_rb, NULL);
}
diff --git a/tools/include/linux/rbtree_augmented.h b/tools/include/linux/rbtree_augmented.h
index ca25818714d3..4db1dcaf90b2 100644
--- a/tools/include/linux/rbtree_augmented.h
+++ b/tools/include/linux/rbtree_augmented.h
@@ -75,7 +75,7 @@ rb_insert_augmented_cached(struct rb_node *node,
}

/*
- * Template for declaring augmented rbtree callbacks
+ * Template for declaring augmented rbtree callbacks (generic case)
*
* RBSTATIC: 'static' or empty
* RBNAME: name of the rb_augment_callbacks structure
@@ -121,6 +121,40 @@ RBSTATIC const struct rb_augment_callbacks RBNAME = { \
.rotate = RBNAME ## _rotate \
};

+/*
+ * Template for declaring augmented rbtree callbacks,
+ * computing RBAUGMENTED scalar as max(RBCOMPUTE(node)) for all subtree nodes.
+ *
+ * RBSTRUCT: struct type of the tree nodes
+ * RBFIELD: name of struct rb_node field within RBSTRUCT
+ * RBTYPE: type of the RBAUGMENTED field
+ * RBAUGMENTED: name of RBTYPE field within RBSTRUCT holding data for subtree
+ * RBCOMPUTE: name of function that returns the per-node RBTYPE scalar
+ * RBSTATIC: 'static' or empty
+ * RBNAME: name of the rb_augment_callbacks structure
+ */
+
+#define RB_DECLARE_CALLBACKS_MAX(RBSTRUCT, RBFIELD, RBTYPE, RBAUGMENTED, \
+ RBCOMPUTE, RBSTATIC, RBNAME) \
+static inline RBTYPE RBNAME ## _compute_max(RBSTRUCT *node) \
+{ \
+ RBSTRUCT *child; \
+ RBTYPE max = RBCOMPUTE(node); \
+ if (node->RBFIELD.rb_left) { \
+ child = rb_entry(node->RBFIELD.rb_left, RBSTRUCT, RBFIELD); \
+ if (child->RBAUGMENTED > max) \
+ max = child->RBAUGMENTED; \
+ } \
+ if (node->RBFIELD.rb_right) { \
+ child = rb_entry(node->RBFIELD.rb_right, RBSTRUCT, RBFIELD); \
+ if (child->RBAUGMENTED > max) \
+ max = child->RBAUGMENTED; \
+ } \
+ return max; \
+} \
+RB_DECLARE_CALLBACKS(RBSTATIC, RBNAME, RBSTRUCT, RBFIELD, \
+ RBTYPE, RBAUGMENTED, RBNAME ## _compute_max)
+

#define RB_RED 0
#define RB_BLACK 1
--
2.22.0.410.gd8fdbe21b5-goog
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