On 05/15/2018 01:58 PM, Peter Zijlstra wrote: > On Tue, May 15, 2018 at 01:38:04PM -0400, Waiman Long wrote: >> +/* >> + * Owner value to indicate the rwsem's owner is not currently known. >> + */ >> +#define RWSEM_OWNER_UNKNOWN ((struct task_struct *)-1) > It might be nice to comment that this works and relies on having that > ANON_OWNER bit set. I am just trying not to expose internal working of rwsem, but I can document that one of the bits is the real deal without specifying which one. Cheers, Longman
