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, 14 deletions

diff --git a/sys/sparc64/sparc64/trap.c b/sys/sparc64/sparc64/trap.c
index b1c0dcc..dcc30f5 100644
--- a/sys/sparc64/sparc64/trap.c
+++ b/sys/sparc64/sparc64/trap.c
@@ -578,13 +578,6 @@ syscall(struct trapframe *tf)
 	CTR5(KTR_SYSC, "syscall: td=%p %s(%#lx, %#lx, %#lx)", td,
 	    syscallnames[code], argp[0], argp[1], argp[2]);
 
-	/*
-	 * Try to run the syscall without the MP lock if the syscall
-	 * is MP safe.
-	 */
-	if ((callp->sy_narg & SYF_MPSAFE) == 0)
-		mtx_lock(&Giant);
-
 #ifdef KTRACE
 	if (KTRPOINT(td, KTR_SYSCALL))
 		ktrsyscall(code, narg, argp);
@@ -641,13 +634,6 @@ syscall(struct trapframe *tf)
 	}
 
 	/*
-	 * Release Giant if we had to get it.  Don't use mtx_owned(),
-	 * we want to catch broken syscalls.
-	 */
-	if ((callp->sy_narg & SYF_MPSAFE) == 0)
-		mtx_unlock(&Giant);
-
-	/*
 	 * Check for misbehavior.
 	 */
 	WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning",