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rcu: List-debug variants of rcu list routines.

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* Make __list_add_rcu check the next->prev and prev->next pointers
  just like __list_add does.
* Make list_del_rcu use __list_del_entry, which does the same checking
  at deletion time.

Has been running for a week here without anything being tripped up,
but it seems worth adding for completeness just in case something
ever does corrupt those lists.

Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Dave Jones
2012-03-14 22:17:39 -04:00
committed by Paul E. McKenney
parent 66f75a5d02
commit 559f9badd1
2 changed files with 28 additions and 1 deletions
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7
include/linux/rculist.h
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@@ -30,6 +30,7 @@
* This is only for internal list manipulation where we know
* the prev/next entries already!
*/
#ifndef CONFIG_DEBUG_LIST
static inline void __list_add_rcu(struct list_head *new,
struct list_head *prev, struct list_head *next)
{
@@ -38,6 +39,10 @@ static inline void __list_add_rcu(struct list_head *new,
rcu_assign_pointer(list_next_rcu(prev), new);
next->prev = new;
}
#else
extern void __list_add_rcu(struct list_head *new,
struct list_head *prev, struct list_head *next);
#endif
/**
* list_add_rcu - add a new entry to rcu-protected list
@@ -108,7 +113,7 @@ static inline void list_add_tail_rcu(struct list_head *new,
*/
static inline void list_del_rcu(struct list_head *entry)
{
__list_del(entry->prev, entry->next);
__list_del_entry(entry);
entry->prev = LIST_POISON2;
}