diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-11-02 10:22:25 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-11-02 10:22:25 -0800 |
commit | 333a07437c31ea8c16a2b82071629a540ae1e50f (patch) | |
tree | b2bc63d29d22238add7e4eb66ed841e7cf6b6932 /arch/ia64/mm/tlb.c | |
parent | d4da6c9ccf648f3f1cb5bf9d981a62c253d30e28 (diff) | |
parent | e8c93fc7b7221b6ac7e7ddbd0e21e205bf9e801a (diff) |
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6:
Revert "[IA64] fix percpu warnings"
[IA64] fix percpu warnings
[IA64] SMT friendly version of spin_unlock_wait()
[IA64] use printk_once() unaligned.c/io_common.c
[IA64] Require SAL 3.2 in order to do extended config space ops
[IA64] unsigned cannot be less than 0 in sn_hwperf_ioctl()
[IA64] Restore registers in the stack on INIT
[IA64] Re-implement spinaphores using ticket lock concepts
[IA64] Squeeze ticket locks back into 4 bytes.
Diffstat (limited to 'arch/ia64/mm/tlb.c')
-rw-r--r-- | arch/ia64/mm/tlb.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/arch/ia64/mm/tlb.c b/arch/ia64/mm/tlb.c index f426dc78d959..ee09d261f2e6 100644 --- a/arch/ia64/mm/tlb.c +++ b/arch/ia64/mm/tlb.c @@ -100,24 +100,36 @@ wrap_mmu_context (struct mm_struct *mm) * this primitive it can be moved up to a spinaphore.h header. */ struct spinaphore { - atomic_t cur; + unsigned long ticket; + unsigned long serve; }; static inline void spinaphore_init(struct spinaphore *ss, int val) { - atomic_set(&ss->cur, val); + ss->ticket = 0; + ss->serve = val; } static inline void down_spin(struct spinaphore *ss) { - while (unlikely(!atomic_add_unless(&ss->cur, -1, 0))) - while (atomic_read(&ss->cur) == 0) - cpu_relax(); + unsigned long t = ia64_fetchadd(1, &ss->ticket, acq), serve; + + if (time_before(t, ss->serve)) + return; + + ia64_invala(); + + for (;;) { + asm volatile ("ld4.c.nc %0=[%1]" : "=r"(serve) : "r"(&ss->serve) : "memory"); + if (time_before(t, serve)) + return; + cpu_relax(); + } } static inline void up_spin(struct spinaphore *ss) { - atomic_add(1, &ss->cur); + ia64_fetchadd(1, &ss->serve, rel); } static struct spinaphore ptcg_sem; |