The patch titled
Subject: vm: adjust ifdef for TINY_RCU
has been added to the -mm tree. Its filename is
vm-adjust-ifdef-for-tiny_rcu.patch
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------------------------------------------------------
From: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Subject: 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 <paulmck@xxxxxxxxxxxxxxxxxx>
Reported-by: Andi Kleen <andi@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pagemap.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/pagemap.h~vm-adjust-ifdef-for-tiny_rcu include/linux/pagemap.h
--- a/include/linux/pagemap.h~vm-adjust-ifdef-for-tiny_rcu
+++ a/include/linux/pagemap.h
@@ -149,7 +149,7 @@ static inline int page_cache_get_specula
{
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
_
Patches currently in -mm which might be from paulmck@xxxxxxxxxxxxxxxxxx are
revert-parts-of-hlist-drop-the-node-parameter-from-iterators.patch
mkcapflagspl-convert-to-mkcapflagssh.patch
headers_installpl-convert-to-headers_installsh.patch
vm-adjust-ifdef-for-tiny_rcu.patch
procfs-improve-scaling-in-proc.patch
procfs-improve-scaling-in-proc-v5.patch
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