lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Fri, 19 Aug 2016 13:57:49 +0800 From: Wanpeng Li <kernellwp@...il.com> To: Waiman Long <Waiman.Long@....com> Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "the arch/x86 maintainers" <x86@...nel.org>, linux-alpha@...r.kernel.org, linux-ia64@...r.kernel.org, linux-s390 <linux-s390@...r.kernel.org>, linux-arch@...r.kernel.org, linux-doc@...r.kernel.org, Davidlohr Bueso <dave@...olabs.net>, Jason Low <jason.low2@...com>, Dave Chinner <david@...morbit.com>, Jonathan Corbet <corbet@....net>, Scott J Norton <scott.norton@....com>, Douglas Hatch <doug.hatch@....com> Subject: Re: [RFC PATCH-tip v4 07/10] locking/rwsem: Change RWSEM_WAITING_BIAS for better disambiguation 2016-08-19 5:11 GMT+08:00 Waiman Long <Waiman.Long@....com>: > 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
Powered by blists - more mailing lists