aboutsummaryrefslogtreecommitdiffstats
path: root/lib/vsprintf.c
diff options
context:
space:
mode:
authorVasiliy Kulikov <segoon@openwall.com>2011-07-28 19:56:40 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-30 14:44:20 -0400
commit4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d (patch)
treec3c81703d022e0c3c43ddffc3ae165eb25aa0b1d /lib/vsprintf.c
parent5774ed014f02120db9a6945a1ecebeb97c2acccb (diff)
shm: optimize locking and ipc_namespace getting
shm_lock() does a lookup of shm segment in shm_ids(ns).ipcs_idr, which is redundant as we already know shmid_kernel address. An actual lock is also not required for reads until we really want to destroy the segment. exit_shm() and shm_destroy_orphaned() may avoid the loop by checking whether there is at least one segment in current ipc_namespace. The check of nsproxy and ipc_ns against NULL is redundant as exit_shm() is called from do_exit() before the call to exit_notify(), so the dereferencing current->nsproxy->ipc_ns is guaranteed to be safe. Reported-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Vasiliy Kulikov <segoon@openwall.com> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/vsprintf.c')
0 files changed, 0 insertions, 0 deletions