linux-kernel - linux-next: manual merge of the tip tree with Linus' tree

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Date:	Wed, 4 Sep 2013 14:24:30 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: linux-next: manual merge of the tip tree with Linus' tree

Hi all,

Today's linux-next merge of the tip tree got a conflict in
arch/x86/include/asm/spinlock.h between commit bc08b449ee14 ("lockref:
implement lockless reference count updates using cmpxchg()") from Linus'
tree and commit 545ac13892ab ("x86, spinlock: Replace pv spinlocks with
pv ticketlocks") from the tip tree.

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

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

diff --cc arch/x86/include/asm/spinlock.h
index e0e6684,8963bfe..0000000
--- a/arch/x86/include/asm/spinlock.h
+++ b/arch/x86/include/asm/spinlock.h
@@@ -34,11 -37,31 +37,36 @@@
  # define UNLOCK_LOCK_PREFIX
  #endif
  
 +static __always_inline int arch_spin_value_unlocked(arch_spinlock_t lock)
 +{
 +	return lock.tickets.head == lock.tickets.tail;
 +}
 +
+ /* How long a lock should spin before we consider blocking */
+ #define SPIN_THRESHOLD	(1 << 15)
+ 
+ extern struct static_key paravirt_ticketlocks_enabled;
+ static __always_inline bool static_key_false(struct static_key *key);
+ 
+ #ifdef CONFIG_PARAVIRT_SPINLOCKS
+ 
+ static inline void __ticket_enter_slowpath(arch_spinlock_t *lock)
+ {
+ 	set_bit(0, (volatile unsigned long *)&lock->tickets.tail);
+ }
+ 
+ #else  /* !CONFIG_PARAVIRT_SPINLOCKS */
+ static __always_inline void __ticket_lock_spinning(arch_spinlock_t *lock,
+ 							__ticket_t ticket)
+ {
+ }
+ static inline void __ticket_unlock_kick(arch_spinlock_t *lock,
+ 							__ticket_t ticket)
+ {
+ }
+ 
+ #endif /* CONFIG_PARAVIRT_SPINLOCKS */
+ 
  /*
   * Ticket locks are conceptually two parts, one indicating the current head of
   * the queue, and the other indicating the current tail. The lock is acquired

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