Author: mjg
Date: Thu Jul  2 19:03:44 2015
New Revision: 285056
URL: https://svnweb.freebsd.org/changeset/base/285056

Log:
  sysvshm: don't lock proc when calculating attach_va
  
  vm_daddr is constant and RLIMIT_DATA can be obtained from thread's copy of
  rlimits.

Modified:
  head/sys/kern/sysv_shm.c

Modified: head/sys/kern/sysv_shm.c
==============================================================================
--- head/sys/kern/sysv_shm.c    Thu Jul  2 19:00:22 2015        (r285055)
+++ head/sys/kern/sysv_shm.c    Thu Jul  2 19:03:44 2015        (r285056)
@@ -380,10 +380,8 @@ kern_shmat_locked(struct thread *td, int
                 * This is just a hint to vm_map_find() about where to
                 * put it.
                 */
-               PROC_LOCK(p);
                attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr +
-                   lim_max_proc(p, RLIMIT_DATA));
-               PROC_UNLOCK(p);
+                   lim_max(td, RLIMIT_DATA));
        }
 
        vm_object_reference(shmseg->object);
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