From 8375ad98cc1defc36adf4a77d9ea1e71db51a371 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Mon, 29 Apr 2013 15:06:13 -0700 Subject: [PATCH] vm: adjust ifdef for TINY_RCU 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. Signed-off-by: Paul E. McKenney Reported-by: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/pagemap.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 0e38e13eb249..e3dea75a078b 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 -- 2.20.1