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lib/rbtree.c: fix the example typo

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Replace `sr` with `Sr`.  The condition `!tmp1 || rb_is_black(tmp1)`
ensures that `tmp1` (which is `sibling->rb_right`) is either NULL or a
black node.  Therefore, the right child of the sibling must be black, and
the example should use `Sr` instead of `sr`.

Link: https://lkml.kernel.org/r/20250403112614.570140-1-johnny1001s000602@gmail.com
Signed-off-by: Chisheng Chen <johnny1001s000602@gmail.com>
Cc: Hsin Chang Yu <zxcvb600870024@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Chisheng Chen 2025-04-03 19:26:14 +08:00 • committed by Andrew Morton
parent db80bd2cea
commit 3dfd79cc87
1 changed files with 4 additions and 4 deletions
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8
lib/rbtree.c
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@ -297,9 +297,9 @@ ____rb_erase_color(struct rb_node *parent, struct rb_root *root,
* / \ / \ * / \ / \
* N S --> N sl * N S --> N sl
* / \ \ * / \ \
* sl sr S * sl Sr S
* \ * \
* sr * Sr
* *
* Note: p might be red, and then both * Note: p might be red, and then both
* p and sl are red after rotation(which * p and sl are red after rotation(which
@ -312,9 +312,9 @@ ____rb_erase_color(struct rb_node *parent, struct rb_root *root,
* / \ / \ * / \ / \
* N sl --> P S * N sl --> P S
* \ / \ * \ / \
* S N sr * S N Sr
* \ * \
* sr * Sr
*/ */
tmp1 = tmp2->rb_right; tmp1 = tmp2->rb_right;
WRITE_ONCE(sibling->rb_left, tmp1); WRITE_ONCE(sibling->rb_left, tmp1);