On 02/12/2015 07:07 PM, Oleg Nesterov wrote:
On 02/12, Raghavendra K T wrote:@@ -772,7 +773,8 @@ __visible void kvm_lock_spinning(struct arch_spinlock *lock, __ticket_t want) * check again make sure it didn't become free while * we weren't looking. */ - if (ACCESS_ONCE(lock->tickets.head) == want) { + head = ACCESS_ONCE(lock->tickets.head); + if (__tickets_equal(head, want)) { add_stats(TAKEN_SLOW_PICKUP, 1);While at it, perhaps it makes sense to s/ACCESS_ONCE/READ_ONCE/ but this is cosmetic.
yes.. will do.
We also need to change another user of enter_slow_path, xen_lock_spinning() in arch/x86/xen/spinlock.c.
Had in mind but forgot before sending. will update resend.
Other than that looks correct at first glance... but this is up to maintainers.
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