Messages in this thread Patch in this message | | | Date | Mon, 4 Mar 2013 08:02:37 -0800 | From | "Paul E. McKenney" <> | Subject | [PATCH RFC] vm: Adjust ifdef for TINY_RCU |
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There is an ifdef in page_cache_get_speculative() that checks for !SMP and TREE_RCU, which has been an impossible combination since the advent of TINY_RCU. The ifdef enables a fastpath that is valid when preemption is disabled by rcu_read_lock() in UP systems, which is the case when TINY_RCU is enabled. This commit therefore adjusts the ifdef to generate the fastpath when TINY_RCU is enabled.
Reported-by: Andi Kleen <andi@firstfloor.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 0e38e13..e3dea75 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -149,7 +149,7 @@ static inline int page_cache_get_speculative(struct page *page) { VM_BUG_ON(in_interrupt()); -#if !defined(CONFIG_SMP) && defined(CONFIG_TREE_RCU) +#ifdef CONFIG_TINY_RCU # ifdef CONFIG_PREEMPT_COUNT VM_BUG_ON(!in_atomic()); # endif
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