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LinuxKPI: Add rb_add_cached function

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rb_add_cached inserts node into the leftmost cached tree

Sponsored by:	Serenity CyberSecurity, LLC
MFC after:	1 week
Reviewed by:	manu
Differential Revision:	https://reviews.freebsd.org/D45608
This commit is contained in:
Vladimir Kondratyev 2024-06-26 23:43:16 +03:00
parent 249e24d76a
commit a5cac2e672
1 changed files with 24 additions and 0 deletions
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24
sys/compat/linuxkpi/common/include/linux/rbtree.h
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@ -175,6 +175,30 @@ rb_replace_node_cached(struct rb_node *old, struct rb_node *new,
root->rb_leftmost = new;
}
static inline struct rb_node *
rb_add_cached(struct rb_node *node, struct rb_root_cached *tree,
bool (*less)(struct rb_node *, const struct rb_node *))
{
struct rb_node **link = &tree->rb_root.rb_node;
struct rb_node *parent = NULL;
bool leftmost = true;
while (*link != NULL) {
parent = *link;
if (less(node, parent)) {
link = &RB_LEFT(parent, __entry);
} else {
link = &RB_RIGHT(parent, __entry);
leftmost = false;
}
}
rb_link_node(node, parent, link);
rb_insert_color_cached(node, tree, leftmost);
return (leftmost ? node : NULL);
}
#undef RB_ROOT
#define RB_ROOT (struct rb_root) { NULL }
#define RB_ROOT_CACHED (struct rb_root_cached) { RB_ROOT, NULL }