lkml.org 
[lkml]   [2020]   [Mar]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH 12/21] list: Poison ->next pointer for non-RCU deletion of 'hlist_nulls_node'
Date
hlist_nulls_del() is used for non-RCU deletion of an 'hlist_nulls_node'
and so we can safely poison the ->next pointer without having to worry
about concurrent readers, just like we do for other non-RCU list
deletion primitives

Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Will Deacon <will@kernel.org>
---
include/linux/list_nulls.h | 1 +
1 file changed, 1 insertion(+)

diff --git a/include/linux/list_nulls.h b/include/linux/list_nulls.h
index fd154ceb5b0d..48f33ae16381 100644
--- a/include/linux/list_nulls.h
+++ b/include/linux/list_nulls.h
@@ -99,6 +99,7 @@ static inline void __hlist_nulls_del(struct hlist_nulls_node *n)
static inline void hlist_nulls_del(struct hlist_nulls_node *n)
{
__hlist_nulls_del(n);
+ n->next = LIST_POISON1;
n->pprev = LIST_POISON2;
}

--
2.20.1
\
 
 \ /
  Last update: 2020-03-24 16:37    [W:0.227 / U:2.264 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site