Push Giant down a little further:

- no longer serialize on Giant for thread_single*() and family in fork,
  exit and exec
- thread_wait() is mpsafe, assert no Giant
- reduce scope of Giant in exit to not cover thread_wait and just do
  vm_waitproc().
- assert that thread_single() family are not called with Giant
- remove the DROP/PICKUP_GIANT macros from thread_single() family
- assert that thread_suspend_check() s not called with Giant
- remove manual drop_giant hack in thread_suspend_check since we know it
  isn't held.
- remove the DROP/PICKUP_GIANT macros from thread_suspend_check() family
- mark kse_create() mpsafe

1 files changed, 0 insertions, 2 deletions

diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c
index d2f60d7..a09dba2 100644
--- a/sys/kern/kern_exec.c
+++ b/sys/kern/kern_exec.c
@@ -253,7 +253,6 @@ kern_execve(td, fname, argv, envv, mac_p)
 	 * that might allow a local user to illicitly obtain elevated
 	 * privileges.
 	 */
-	mtx_lock(&Giant);
 	PROC_LOCK(p);
 	KASSERT((p->p_flag & P_INEXEC) == 0,
 	    ("%s(): process already has P_INEXEC flag", __func__));
@@ -271,7 +270,6 @@ kern_execve(td, fname, argv, envv, mac_p)
 		td->td_mailbox = NULL;
 		thread_single_end();
 	}
-	mtx_unlock(&Giant);
 	p->p_flag |= P_INEXEC;
 	PROC_UNLOCK(p);