Re: [RFC PATCH-tip v4 07/10] locking/rwsem: Change RWSEM_WAITING_BIAS for better disambiguation
From: Wanpeng Li <hidden>
Date: 2016-08-19 05:57:55
Also in:
linux-arch, linux-s390, lkml
2016-08-19 5:11 GMT+08:00 Waiman Long [off-list ref]:
When the count value is in between 0 and RWSEM_WAITING_BIAS, there are 2 possibilities. Either a writer is present and there is no waiter
count = 0xffff0001
or there are waiters and readers. There is no easy way to
count = 0xffff000X However, RWSEM_WAITING_BIAS is equal to 0xffff0000, so both these two cases are beyond RWSEM_WAITING_BIAS, right? Regards, Wanpeng Li