On 04/05/2013 12:38 AM, Mike Galbraith wrote:
On Tue, 2013-03-26 at 16:00 -0400, Rik van Riel wrote:
The ipc semaphore code has a nasty RCU locking tangle, with both
find_alloc_undo and semtimedop taking the rcu_read_lock(). The
code can be cleaned up somewhat by only taking the rcu_read_lock
once.
There are no other callers to find_alloc_undo.
This should also solve the trinity issue reported by Sasha Levin.
I take it this is on top of the patchlet Sasha submitted?
Indeed, and all the other fixes that got submitted :)
(I hit rcu stall banging on patch set in rt with 60 synchronized core
executive model if I let it run long enough, fwtw)
What are you using to trigger an rcu stall?
Reported-by: Sasha Levin <sasha.le...@oracle.com>
Signed-off-by: Rik van Riel <r...@redhat.com>
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