linux-kernel - linux-next: manual merge of the rcu tree with the modules and tip trees

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Date:	Thu, 28 May 2015 17:25:07 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: linux-next: manual merge of the rcu tree with the modules and tip
 trees

Hi Paul,

Today's linux-next merge of the rcu tree got a conflict in
include/linux/rcupdate.h between commits 0a04b0166929 ("rcu: Move
lockless_dereference() out of rcupdate.h") from the modules tree and
c1ad348b452a ("tick: Nohz: Rework next timer evaluation") from the tip
tree and commits 7d0ae8086b82 ("rcu: Convert ACCESS_ONCE() to
READ_ONCE() and WRITE_ONCE()") and 3382adbc1bb8 ("rcu: Eliminate a few
CONFIG_RCU_NOCB_CPU_ALL #ifdefs") from the rcu tree.

I fixed it up (see below) and can carry the fix as necessary (no action
is required).

I also had to add this merge fix patch:

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Thu, 28 May 2015 17:20:58 +1000
Subject: [PATCH] rcu: merge fix for Convert ACCESS_ONCE() to READ_ONCE() and
 WRITE_ONCE()

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 include/linux/compiler.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index ba91e5c88a32..f7e7235f3a91 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -483,7 +483,7 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
  */
 #define lockless_dereference(p) \
 ({ \
-	typeof(p) _________p1 = ACCESS_ONCE(p); \
+	typeof(p) _________p1 = READ_ONCE(p); \
 	smp_read_barrier_depends(); /* Dependency order vs. p above. */ \
 	(_________p1); \
 })
-- 
2.1.4

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

diff --cc include/linux/rcupdate.h
index ed5f66464ab3,3a4d1bf430b1..000000000000
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@@ -1140,13 -1063,13 +1050,13 @@@ static inline notrace void rcu_read_unl
  #define kfree_rcu(ptr, rcu_head)					\
  	__kfree_rcu(&((ptr)->rcu_head), offsetof(typeof(*(ptr)), rcu_head))
  
- #if defined(CONFIG_TINY_RCU) || defined(CONFIG_RCU_NOCB_CPU_ALL)
+ #ifdef CONFIG_TINY_RCU
 -static inline int rcu_needs_cpu(unsigned long *delta_jiffies)
 +static inline int rcu_needs_cpu(u64 basemono, u64 *nextevt)
  {
 -	*delta_jiffies = ULONG_MAX;
 +	*nextevt = KTIME_MAX;
  	return 0;
  }
- #endif /* #if defined(CONFIG_TINY_RCU) || defined(CONFIG_RCU_NOCB_CPU_ALL) */
+ #endif /* #ifdef CONFIG_TINY_RCU */
  
  #if defined(CONFIG_RCU_NOCB_CPU_ALL)
  static inline bool rcu_is_nocb_cpu(int cpu) { return true; }

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