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Subject[PATCH 8/8] x86/ticketlock: use xadd helper
Date
From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
arch/x86/include/asm/spinlock.h | 9 +--------
1 files changed, 1 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h
index dac6fc6..2d14e7c 100644
--- a/arch/x86/include/asm/spinlock.h
+++ b/arch/x86/include/asm/spinlock.h
@@ -71,14 +71,7 @@ static __always_inline struct __raw_tickets __ticket_spin_claim(struct arch_spin
{
register struct __raw_tickets tickets = { .tail = 1 };

- if (sizeof(lock->tickets.head) == sizeof(u8))
- asm volatile (LOCK_PREFIX "xaddw %w0, %1\n"
- : "+r" (tickets), "+m" (lock->tickets)
- : : "memory", "cc");
- else
- asm volatile (LOCK_PREFIX "xaddl %0, %1\n"
- : "+r" (tickets), "+m" (lock->tickets)
- : : "memory", "cc");
+ xadd(&lock->tickets, tickets);

return tickets;
}
--
1.7.5.4


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