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.

1 files changed, 0 insertions, 13 deletions

diff --git a/sys/amd64/ia32/ia32_syscall.c b/sys/amd64/ia32/ia32_syscall.c
index 644235d..470ce63 100644
--- a/sys/amd64/ia32/ia32_syscall.c
+++ b/sys/amd64/ia32/ia32_syscall.c
@@ -175,13 +175,6 @@ ia32_syscall(struct trapframe frame)
 	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] = frame.tf_rdx;
@@ -226,12 +219,6 @@ ia32_syscall(struct trapframe frame)
 	}
 
 	/*
-	 * Release Giant if we previously set it.
-	 */
-	if ((callp->sy_narg & SYF_MPSAFE) == 0)
-		mtx_unlock(&Giant);
-
-	/*
 	 * Traced syscall.
 	 */
 	if (orig_tf_rflags & PSL_T) {