[lkml]   [2009]   [Apr]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC][PATCH v3 2/6] mm, directio: fix fork vs direct-io race (read(2) side IOW gup(write) side)
On Tue, Apr 14, 2009 at 02:10:08PM -0400, Jeff Moyer wrote:
> Really? I don't actually see that in the code, have I missed it?

Checking the spinlock version, when any writer is waiting, the
sem->wait_list won't empty and down_read will wait too. The wakeup is
FIFO with __rwsem_do_wake is doing a wake-one if first one in queue is
a down_write. So it looks ok to me. asm version should have an
equivalent logic.

 \ /
  Last update: 2009-04-14 21:53    [W:0.049 / U:1.676 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site