Now that all system calls are MPSAFE, retire the SYF_MPSAFE flag used to

mark system calls as being MPSAFE:
- Stop conditionally acquiring Giant around system call invocations.
- Remove all of the 'M' prefixes from the master system call files.
- Remove support for the 'M' prefix from the script that generates the
  syscall-related files from the master system call files.
- Don't explicitly set SYF_MPSAFE when registering nfssvc.

2 files changed, 1 insertions, 22 deletions

diff --git a/sys/ia64/ia32/ia32_trap.c b/sys/ia64/ia32/ia32_trap.c
index f63ae94..a5c74d4 100644
--- a/sys/ia64/ia32/ia32_trap.c
+++ b/sys/ia64/ia32/ia32_trap.c
@@ -114,13 +114,6 @@ ia32_syscall(struct trapframe *tf)
 	CTR4(KTR_SYSC, "syscall enter thread %p pid %d proc %s code %d", td,
 	    td->td_proc->p_pid, td->td_proc->p_comm, code);
 
-	/*
-	 * Try to run the syscall without Giant if the syscall
-	 * is MP safe.
-	 */
-	if ((callp->sy_narg & SYF_MPSAFE) == 0)
-		mtx_lock(&Giant);
-
 	if (error == 0) {
 		td->td_retval[0] = 0;
 		td->td_retval[1] = tf->tf_scratch.gr10;	/* edx */
@@ -163,12 +156,6 @@ ia32_syscall(struct trapframe *tf)
 	}
 
 	/*
-	 * Release Giant if we previously set it.
-	 */
-	if ((callp->sy_narg & SYF_MPSAFE) == 0)
-		mtx_unlock(&Giant);
-
-	/*
 	 * Traced syscall.
 	 */
 	if ((eflags & PSL_T) && !(eflags & PSL_VM)) {
diff --git a/sys/ia64/ia64/trap.c b/sys/ia64/ia64/trap.c
index d0f3c98..3ac45ce 100644
--- a/sys/ia64/ia64/trap.c
+++ b/sys/ia64/ia64/trap.c
@@ -1016,15 +1016,7 @@ syscall(struct trapframe *tf)
 
 	PTRACESTOP_SC(p, td, S_PT_SCE);
 
-	/*
-	 * Grab Giant if the syscall is not flagged as MP safe.
-	 */
-	if ((callp->sy_narg & SYF_MPSAFE) == 0) {
-		mtx_lock(&Giant);
-		error = (*callp->sy_call)(td, args);
-		mtx_unlock(&Giant);
-	} else
-		error = (*callp->sy_call)(td, args);
+	error = (*callp->sy_call)(td, args);
 
 	if (error != EJUSTRETURN) {
 		/*