Hi Davidlohr,
We noticed LTP test failures
ltp.msgget02.1.TFAIL
ltp.semget02.2.TFAIL
ltp.semget02.3.TFAIL
and the first bad commit is
commit 5769cf6355d87f63906b3e51887eff7017c39217
Author: Davidlohr Bueso <[email protected]>
AuthorDate: Wed Jan 15 16:56:01 2014 +1100
Commit: Stephen Rothwell <[email protected]>
CommitDate: Wed Jan 15 16:56:01 2014 +1100
ipc: share ids rwsem when possible in ipcget_public
... and rewrite the function. For scenarios where the key is found and
we end up just doing different routinary checks, we can downgrade the
ids->rwsem and share it among concurrent readers. These checks include
the following, which are all safe to share the lock:
ops->more_checks() >> sem_more_checks(), shm_more_checks()
ipc_check_perms() >> ipcperms(),ops->associate() >>
[lsm]_[ipctype]_associate()
Signed-off-by: Davidlohr Bueso <[email protected]>
Cc: Aswin Chandramouleeswaran <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Manfred Spraul <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
ipc/util.c | 60 +++++++++++++++++++++++++++++++++---------------------------
1 file changed, 33 insertions(+), 27 deletions(-)
Thanks,
Fengguang
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