From 444b8a83f1e01584ff2d53f5951d8e836c0070b5 Mon Sep 17 00:00:00 2001
From: Michel Lespinasse <walken@google.com>
Date: Wed, 25 Sep 2019 16:46:04 -0700
Subject: [PATCH 1/3] augmented rbtree: add comments for RB_DECLARE_CALLBACKS macro
Git-commit: 444b8a83f1e01584ff2d53f5951d8e836c0070b5
Patch-mainline: v5.4-rc1
References: bsc#1159864
Patch series "make RB_DECLARE_CALLBACKS more generic", v3.
These changes are intended to make the RB_DECLARE_CALLBACKS macro more
generic (allowing the aubmented subtree information to be a struct instead
of a scalar).
I have verified the compiled lib/interval_tree.o and mm/mmap.o files to
check that they didn't change. This held as expected for interval_tree.o;
mmap.o did have some changes which could be reverted by marking
__vma_link_rb as noinline. I did not add such a change to the patchset; I
felt it was reasonable enough to leave the inlining decision up to the
compiler.
This patch (of 3):
Add a short comment summarizing the arguments to RB_DECLARE_CALLBACKS.
The arguments are also now capitalized. This copies the style of the
INTERVAL_TREE_DEFINE macro.
No functional changes in this commit, only comments and capitalization.
Link: http://lkml.kernel.org/r/20190703040156.56953-2-walken@google.com
Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: Davidlohr Bueso <dbueso@suse.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Uladzislau Rezki <urezki@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
---
include/linux/rbtree_augmented.h | 54 +++++++++++++++++++++-------------
tools/include/linux/rbtree_augmented.h | 54 +++++++++++++++++++++-------------
2 files changed, 66 insertions(+), 42 deletions(-)
diff --git a/include/linux/rbtree_augmented.h b/include/linux/rbtree_augmented.h
index 179faab29f52..979941600082 100644
--- a/include/linux/rbtree_augmented.h
+++ b/include/linux/rbtree_augmented.h
@@ -60,39 +60,51 @@ rb_insert_augmented_cached(struct rb_node *node,
rb_insert_augmented(node, &root->rb_root, augment);
}
-#define RB_DECLARE_CALLBACKS(rbstatic, rbname, rbstruct, rbfield, \
- rbtype, rbaugmented, rbcompute) \
+/*
+ * Template for declaring augmented rbtree callbacks
+ *
+ * RBSTATIC: 'static' or empty
+ * RBNAME: name of the rb_augment_callbacks structure
+ * 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 recomputes the RBAUGMENTED data
+ */
+
+#define RB_DECLARE_CALLBACKS(RBSTATIC, RBNAME, RBSTRUCT, RBFIELD, \
+ RBTYPE, RBAUGMENTED, RBCOMPUTE) \
static inline void \
-rbname ## _propagate(struct rb_node *rb, struct rb_node *stop) \
+RBNAME ## _propagate(struct rb_node *rb, struct rb_node *stop) \
{ \
while (rb != stop) { \
- rbstruct *node = rb_entry(rb, rbstruct, rbfield); \
- rbtype augmented = rbcompute(node); \
- if (node->rbaugmented == augmented) \
+ RBSTRUCT *node = rb_entry(rb, RBSTRUCT, RBFIELD); \
+ RBTYPE augmented = RBCOMPUTE(node); \
+ if (node->RBAUGMENTED == augmented) \
break; \
- node->rbaugmented = augmented; \
- rb = rb_parent(&node->rbfield); \
+ node->RBAUGMENTED = augmented; \
+ rb = rb_parent(&node->RBFIELD); \
} \
} \
static inline void \
-rbname ## _copy(struct rb_node *rb_old, struct rb_node *rb_new) \
+RBNAME ## _copy(struct rb_node *rb_old, struct rb_node *rb_new) \
{ \
- rbstruct *old = rb_entry(rb_old, rbstruct, rbfield); \
- rbstruct *new = rb_entry(rb_new, rbstruct, rbfield); \
- new->rbaugmented = old->rbaugmented; \
+ RBSTRUCT *old = rb_entry(rb_old, RBSTRUCT, RBFIELD); \
+ RBSTRUCT *new = rb_entry(rb_new, RBSTRUCT, RBFIELD); \
+ new->RBAUGMENTED = old->RBAUGMENTED; \
} \
static void \
-rbname ## _rotate(struct rb_node *rb_old, struct rb_node *rb_new) \
+RBNAME ## _rotate(struct rb_node *rb_old, struct rb_node *rb_new) \
{ \
- rbstruct *old = rb_entry(rb_old, rbstruct, rbfield); \
- rbstruct *new = rb_entry(rb_new, rbstruct, rbfield); \
- new->rbaugmented = old->rbaugmented; \
- old->rbaugmented = rbcompute(old); \
+ RBSTRUCT *old = rb_entry(rb_old, RBSTRUCT, RBFIELD); \
+ RBSTRUCT *new = rb_entry(rb_new, RBSTRUCT, RBFIELD); \
+ new->RBAUGMENTED = old->RBAUGMENTED; \
+ old->RBAUGMENTED = RBCOMPUTE(old); \
} \
-rbstatic const struct rb_augment_callbacks rbname = { \
- .propagate = rbname ## _propagate, \
- .copy = rbname ## _copy, \
- .rotate = rbname ## _rotate \
+RBSTATIC const struct rb_augment_callbacks RBNAME = { \
+ .propagate = RBNAME ## _propagate, \
+ .copy = RBNAME ## _copy, \
+ .rotate = RBNAME ## _rotate \
};
diff --git a/tools/include/linux/rbtree_augmented.h b/tools/include/linux/rbtree_augmented.h
index 467a3eefe1d2..de3a480204ba 100644
--- a/tools/include/linux/rbtree_augmented.h
+++ b/tools/include/linux/rbtree_augmented.h
@@ -62,39 +62,51 @@ rb_insert_augmented_cached(struct rb_node *node,
rb_insert_augmented(node, &root->rb_root, augment);
}
-#define RB_DECLARE_CALLBACKS(rbstatic, rbname, rbstruct, rbfield, \
- rbtype, rbaugmented, rbcompute) \
+/*
+ * Template for declaring augmented rbtree callbacks
+ *
+ * RBSTATIC: 'static' or empty
+ * RBNAME: name of the rb_augment_callbacks structure
+ * 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 recomputes the RBAUGMENTED data
+ */
+
+#define RB_DECLARE_CALLBACKS(RBSTATIC, RBNAME, RBSTRUCT, RBFIELD, \
+ RBTYPE, RBAUGMENTED, RBCOMPUTE) \
static inline void \
-rbname ## _propagate(struct rb_node *rb, struct rb_node *stop) \
+RBNAME ## _propagate(struct rb_node *rb, struct rb_node *stop) \
{ \
while (rb != stop) { \
- rbstruct *node = rb_entry(rb, rbstruct, rbfield); \
- rbtype augmented = rbcompute(node); \
- if (node->rbaugmented == augmented) \
+ RBSTRUCT *node = rb_entry(rb, RBSTRUCT, RBFIELD); \
+ RBTYPE augmented = RBCOMPUTE(node); \
+ if (node->RBAUGMENTED == augmented) \
break; \
- node->rbaugmented = augmented; \
- rb = rb_parent(&node->rbfield); \
+ node->RBAUGMENTED = augmented; \
+ rb = rb_parent(&node->RBFIELD); \
} \
} \
static inline void \
-rbname ## _copy(struct rb_node *rb_old, struct rb_node *rb_new) \
+RBNAME ## _copy(struct rb_node *rb_old, struct rb_node *rb_new) \
{ \
- rbstruct *old = rb_entry(rb_old, rbstruct, rbfield); \
- rbstruct *new = rb_entry(rb_new, rbstruct, rbfield); \
- new->rbaugmented = old->rbaugmented; \
+ RBSTRUCT *old = rb_entry(rb_old, RBSTRUCT, RBFIELD); \
+ RBSTRUCT *new = rb_entry(rb_new, RBSTRUCT, RBFIELD); \
+ new->RBAUGMENTED = old->RBAUGMENTED; \
} \
static void \
-rbname ## _rotate(struct rb_node *rb_old, struct rb_node *rb_new) \
+RBNAME ## _rotate(struct rb_node *rb_old, struct rb_node *rb_new) \
{ \
- rbstruct *old = rb_entry(rb_old, rbstruct, rbfield); \
- rbstruct *new = rb_entry(rb_new, rbstruct, rbfield); \
- new->rbaugmented = old->rbaugmented; \
- old->rbaugmented = rbcompute(old); \
+ RBSTRUCT *old = rb_entry(rb_old, RBSTRUCT, RBFIELD); \
+ RBSTRUCT *new = rb_entry(rb_new, RBSTRUCT, RBFIELD); \
+ new->RBAUGMENTED = old->RBAUGMENTED; \
+ old->RBAUGMENTED = RBCOMPUTE(old); \
} \
-rbstatic const struct rb_augment_callbacks rbname = { \
- .propagate = rbname ## _propagate, \
- .copy = rbname ## _copy, \
- .rotate = rbname ## _rotate \
+RBSTATIC const struct rb_augment_callbacks RBNAME = { \
+ .propagate = RBNAME ## _propagate, \
+ .copy = RBNAME ## _copy, \
+ .rotate = RBNAME ## _rotate \
};
--
2.16.4