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rcu: Export debug_init_rcu_head() and and debug_init_rcu_head()

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Currently, call_rcu() relies on implicit allocation and initialization
for the debug-objects handling of RCU callbacks.  If you hammer the
kernel hard enough with Sasha's modified version of trinity, you can end
up with the sl*b allocators recursing into themselves via this implicit
call_rcu() allocation.

This commit therefore exports the debug_init_rcu_head() and
debug_rcu_head_free() functions, which permits the allocators to allocated
and pre-initialize the debug-objects information, so that there no longer
any need for call_rcu() to do that initialization, which in turn prevents
the recursion into the memory allocators.

Reported-by: Sasha Levin <[email protected]>
Suggested-by: Thomas Gleixner <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
Looks-good-to: Christoph Lameter <[email protected]>
This commit is contained in:
Paul E. McKenney 2014-06-19 14:57:10 -07:00
commit 546a9d8519
2 changed files with 12 additions and 2 deletions
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4
kernel/rcu/update.c
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@ -200,12 +200,12 @@ void wait_rcu_gp(call_rcu_func_t crf)
EXPORT_SYMBOL_GPL(wait_rcu_gp);
#ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
static inline void debug_init_rcu_head(struct rcu_head *head)
void init_rcu_head(struct rcu_head *head)
{
debug_object_init(head, &rcuhead_debug_descr);
}
static inline void debug_rcu_head_free(struct rcu_head *head)
void destroy_rcu_head(struct rcu_head *head)
{
debug_object_free(head, &rcuhead_debug_descr);
}