| Age | Commit message (Collapse) | Author | Files | Lines | |
|---|---|---|---|---|---|
| 2013-06-03 | percpu-refcount: Don't use silly cmpxchg() | Kent Overstreet | 1 | -15/+4 | |
| The cmpxchg() was just to ensure the debug check didn't race, which was a bit excessive. The caller is supposed to do the appropriate synchronization, which means percpu_ref_kill() can just do a simple store. Signed-off-by: Kent Overstreet <[email protected]> Signed-off-by: Tejun Heo <[email protected]> | |||||
| 2013-06-03 | percpu: implement generic percpu refcounting | Kent Overstreet | 1 | -0/+128 | |
| This implements a refcount with similar semantics to atomic_get()/atomic_dec_and_test() - but percpu. It also implements two stage shutdown, as we need it to tear down the percpu counts. Before dropping the initial refcount, you must call percpu_ref_kill(); this puts the refcount in "shutting down mode" and switches back to a single atomic refcount with the appropriate barriers (synchronize_rcu()). It's also legal to call percpu_ref_kill() multiple times - it only returns true once, so callers don't have to reimplement shutdown synchronization. [[email protected]: fix build] [[email protected]: coding-style tweak] Signed-off-by: Kent Overstreet <[email protected]> Cc: Zach Brown <[email protected]> Cc: Felipe Balbi <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Mark Fasheh <[email protected]> Cc: Joel Becker <[email protected]> Cc: Rusty Russell <[email protected]> Cc: Jens Axboe <[email protected]> Cc: Asai Thambi S P <[email protected]> Cc: Selvan Mani <[email protected]> Cc: Sam Bradshaw <[email protected]> Cc: Jeff Moyer <[email protected]> Cc: Al Viro <[email protected]> Cc: Benjamin LaHaise <[email protected]> Cc: Tejun Heo <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: Ingo Molnar <[email protected]> Reviewed-by: "Theodore Ts'o" <[email protected]> Signed-off-by: Tejun Heo <[email protected]> | |||||