[PATCH] rbtree: remove unneeded explicit alignment in struct rb_node

[Lukas Bulwahn <lukas.bulwahn@gmail.com>]

Commit e977145aeaad ("[RBTREE] Add explicit alignment to sizeof(long) for
struct rb_node.") adds an explicit alignment to the struct rb_node due to
some speciality of the CRIS architecture.

The support for the CRIS architecture was removed with commit c690eddc2f3b
("CRIS: Drop support for the CRIS port")

So, remove this now unneeded explicit alignment in struct rb_node as well.

This basically reverts commit e977145aeaad ("[RBTREE] Add explicit
alignment to sizeof(long) for struct rb_node.").

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Mete Polat <metepolat2000@gmail.com>
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
---
applies cleanly on next-20210804, but only x86 compile-checked.

Michel, Davidlohr, Jesper, David, please ack.

Mete, you might want to re-run your RBT test suite for this change.

Andrew, once acked, please pick this minor cleanup into your tree.

 include/linux/rbtree.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index d31ecaf4fdd3..e9390be1ba67 100644
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -25,8 +25,7 @@ struct rb_node {
 	unsigned long  __rb_parent_color;
 	struct rb_node *rb_right;
 	struct rb_node *rb_left;
-} __attribute__((aligned(sizeof(long))));
-    /* The alignment might seem pointless, but allegedly CRIS needs it */
+};
 
 struct rb_root {
 	struct rb_node *rb_node;
-- 
2.17.1