[ Just adding Andrew to the cc list ] On Fri, 17 Jan 2014 18:24:28 +0800 Fengguang Wu <fengguang...@intel.com> wrote: > > 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 <davidl...@hp.com> > AuthorDate: Wed Jan 15 16:56:01 2014 +1100 > Commit: Stephen Rothwell <s...@canb.auug.org.au> > 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 <davidl...@hp.com> > Cc: Aswin Chandramouleeswaran <as...@hp.com> > Cc: Rik van Riel <r...@redhat.com> > Cc: Manfred Spraul <manf...@colorfullife.com> > Signed-off-by: Andrew Morton <a...@linux-foundation.org> > > ipc/util.c | 60 +++++++++++++++++++++++++++++++++--------------------------- > 1 file changed, 33 insertions(+), 27 deletions(-) > > Thanks, > Fengguang >
-- Cheers, Stephen Rothwell s...@canb.auug.org.au
pgpig_tWSdlcn.pgp
Description: PGP signature
