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List: netfilter-devel
Subject: [PATCH RFC 15/26] ia64: Remove spin_unlock_wait() arch-specific definitions
From: "Paul E. McKenney" <paulmck () linux ! vnet ! ibm ! com>
Date: 2017-06-30 0:01:23
Message-ID: 1498780894-8253-15-git-send-email-paulmck () linux ! vnet ! ibm ! com
[Download RAW message or body]
There is no agreed-upon definition of spin_unlock_wait()'s semantics,
and it appears that all callers could do just as well with a lock/unlock
pair. This commit therefore removes the underlying arch-specific
arch_spin_unlock_wait().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: <linux-ia64@vger.kernel.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Andrea Parri <parri.andrea@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
---
arch/ia64/include/asm/spinlock.h | 21 ---------------------
1 file changed, 21 deletions(-)
diff --git a/arch/ia64/include/asm/spinlock.h b/arch/ia64/include/asm/spinlock.h
index ca9e76149a4a..df2c121164b8 100644
--- a/arch/ia64/include/asm/spinlock.h
+++ b/arch/ia64/include/asm/spinlock.h
@@ -76,22 +76,6 @@ static __always_inline void __ticket_spin_unlock(arch_spinlock_t *lock)
ACCESS_ONCE(*p) = (tmp + 2) & ~1;
}
-static __always_inline void __ticket_spin_unlock_wait(arch_spinlock_t *lock)
-{
- int *p = (int *)&lock->lock, ticket;
-
- ia64_invala();
-
- for (;;) {
- asm volatile ("ld4.c.nc %0=[%1]" : "=r"(ticket) : "r"(p) : "memory");
- if (!(((ticket >> TICKET_SHIFT) ^ ticket) & TICKET_MASK))
- return;
- cpu_relax();
- }
-
- smp_acquire__after_ctrl_dep();
-}
-
static inline int __ticket_spin_is_locked(arch_spinlock_t *lock)
{
long tmp = ACCESS_ONCE(lock->lock);
@@ -143,11 +127,6 @@ static __always_inline void arch_spin_lock_flags(arch_spinlock_t *lock,
arch_spin_lock(lock);
}
-static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
-{
- __ticket_spin_unlock_wait(lock);
-}
-
#define arch_read_can_lock(rw) (*(volatile int *)(rw) >= 0)
#define arch_write_can_lock(rw) (*(volatile int *)(rw) == 0)
--
2.5.2
--
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