linux-kernel - [PATCH 1/1] tools lib rbtree: Pick some improvements from the kernel rbtree code

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Date: Tue, 23 Apr 2024 17:27:57 -0300
From: arnaldo.melo@...il.com
To: Namhyung Kim <namhyung@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>,
	Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Noah Goldstein <goldstein.w.n@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/1] tools lib rbtree: Pick some improvements from the kernel
 rbtree code

The tools/lib/rbtree.c code came from the kernel, removing the
EXPORT_SYMBOL() that make sense only there, unfortunately it is not
being checked with tools/perf/check_headers.sh, will try to remedy this,
till then pick the improvements from:

  b0687c1119b4e8c8 ("lib/rbtree: use '+' instead of '|' for setting color.")

That I noticed by doing:

  diff -u tools/lib/rbtree.c lib/rbtree.c
  diff -u tools/include/linux/rbtree_augmented.h include/linux/rbtree_augmented.h

There is one other cases, but lets pick it in separate patches.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Ian Rogers <irogers@...gle.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Kan Liang <kan.liang@...ux.intel.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Noah Goldstein <goldstein.w.n@...il.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/include/linux/rbtree_augmented.h | 4 ++--
 tools/lib/rbtree.c                     | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/include/linux/rbtree_augmented.h b/tools/include/linux/rbtree_augmented.h
index 570bb9794421b975..95483c7d81df74fb 100644
--- a/tools/include/linux/rbtree_augmented.h
+++ b/tools/include/linux/rbtree_augmented.h
@@ -158,13 +158,13 @@ RB_DECLARE_CALLBACKS(RBSTATIC, RBNAME,					      \
 
 static inline void rb_set_parent(struct rb_node *rb, struct rb_node *p)
 {
-	rb->__rb_parent_color = rb_color(rb) | (unsigned long)p;
+	rb->__rb_parent_color = rb_color(rb) + (unsigned long)p;
 }
 
 static inline void rb_set_parent_color(struct rb_node *rb,
 				       struct rb_node *p, int color)
 {
-	rb->__rb_parent_color = (unsigned long)p | color;
+	rb->__rb_parent_color = (unsigned long)p + color;
 }
 
 static inline void
diff --git a/tools/lib/rbtree.c b/tools/lib/rbtree.c
index 727396de6be54f20..9e7307186b7f4123 100644
--- a/tools/lib/rbtree.c
+++ b/tools/lib/rbtree.c
@@ -58,7 +58,7 @@
 
 static inline void rb_set_black(struct rb_node *rb)
 {
-	rb->__rb_parent_color |= RB_BLACK;
+	rb->__rb_parent_color += RB_BLACK;
 }
 
 static inline struct rb_node *rb_red_parent(struct rb_node *red)
-- 
2.44.0