svn commit: r189572 - in head/sys: amd64/amd64 i386/i386

[Robert Watson]

Author: rwatson
Date: Mon Mar  9 13:11:16 2009
New Revision: 189572
URL: http://svn.freebsd.org/changeset/base/189572

Log:
  Trim comments about the MP-safety of various bits of the amd64/i386
  system call entry path and i386 IP checksum generation: we now assume
  all code is MPSAFE unless explicitly marked otherwise.  Remove XXX
  Giant comments along similar lines: the code by the comments either
  doesn't need or doesn't want Giant (especially the NMI handler).
  
  MFC after:	3 days

Modified:
  head/sys/amd64/amd64/trap.c
  head/sys/i386/i386/in_cksum.c
  head/sys/i386/i386/trap.c

Modified: head/sys/amd64/amd64/trap.c
==============================================================================
--- head/sys/amd64/amd64/trap.c	Mon Mar  9 11:18:41 2009	(r189571)
+++ head/sys/amd64/amd64/trap.c	Mon Mar  9 13:11:16 2009	(r189572)
@@ -386,7 +386,6 @@ trap(struct trapframe *frame)
 #ifdef DEV_ISA
 		case T_NMI:
 			/* machine/parity/power fail/"kitchen sink" faults */
-			/* XXX Giant */
 			if (isa_nmi(code) == 0) {
 #ifdef KDB
 				/*
@@ -530,7 +529,6 @@ trap(struct trapframe *frame)
 
 #ifdef DEV_ISA
 		case T_NMI:
-			/* XXX Giant */
 			/* machine/parity/power fail/"kitchen sink" faults */
 			if (isa_nmi(code) == 0) {
 #ifdef KDB
@@ -820,9 +818,6 @@ syscall(struct trapframe *frame)
 	orig_tf_rflags = frame->tf_rflags;
 
 	if (p->p_sysent->sv_prepsyscall) {
-		/*
-		 * The prep code is MP aware.
-		 */
 		(*p->p_sysent->sv_prepsyscall)(frame, (int *)args, &code, &params);
 	} else {
 		if (code == SYS_syscall || code == SYS___syscall) {
@@ -841,10 +836,6 @@ syscall(struct trapframe *frame)
  		callp = &p->p_sysent->sv_table[code];
 
 	narg = callp->sy_narg;
-
-	/*
-	 * copyin and the ktrsyscall()/ktrsysret() code is MP-aware
-	 */
 	KASSERT(narg <= sizeof(args) / sizeof(args[0]),
 	    ("Too many syscall arguments!"));
 	error = 0;

Modified: head/sys/i386/i386/in_cksum.c
==============================================================================
--- head/sys/i386/i386/in_cksum.c	Mon Mar  9 11:18:41 2009	(r189571)
+++ head/sys/i386/i386/in_cksum.c	Mon Mar  9 13:11:16 2009	(r189572)
@@ -33,9 +33,6 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-/*
- * MPsafe: alfred
- */
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/mbuf.h>

Modified: head/sys/i386/i386/trap.c
==============================================================================
--- head/sys/i386/i386/trap.c	Mon Mar  9 11:18:41 2009	(r189571)
+++ head/sys/i386/i386/trap.c	Mon Mar  9 13:11:16 2009	(r189572)
@@ -461,7 +461,6 @@ trap(struct trapframe *frame)
 			goto userout;
 #else /* !POWERFAIL_NMI */
 			/* machine/parity/power fail/"kitchen sink" faults */
-			/* XXX Giant */
 			if (isa_nmi(code) == 0) {
 #ifdef KDB
 				/*
@@ -658,7 +657,6 @@ trap(struct trapframe *frame)
 			 * in kernel space because that is useful when
 			 * debugging the kernel.
 			 */
-			/* XXX Giant */
 			if (user_dbreg_trap() && 
 			   !(PCPU_GET(curpcb)->pcb_flags & PCB_VM86CALL)) {
 				/*
@@ -692,7 +690,6 @@ trap(struct trapframe *frame)
 			}
 			goto out;
 #else /* !POWERFAIL_NMI */
-			/* XXX Giant */
 			/* machine/parity/power fail/"kitchen sink" faults */
 			if (isa_nmi(code) == 0) {
 #ifdef KDB
@@ -999,14 +996,10 @@ syscall(struct trapframe *frame)
 	orig_tf_eflags = frame->tf_eflags;
 
 	if (p->p_sysent->sv_prepsyscall) {
-		/*
-		 * The prep code is MP aware.
-		 */
 		(*p->p_sysent->sv_prepsyscall)(frame, args, &code, &params);
 	} else {
 		/*
 		 * Need to check if this is a 32 bit or 64 bit syscall.
-		 * fuword is MP aware.
 		 */
 		if (code == SYS_syscall) {
 			/*
@@ -1034,9 +1027,6 @@ syscall(struct trapframe *frame)
 
 	narg = callp->sy_narg;
 
-	/*
-	 * copyin and the ktrsyscall()/ktrsysret() code is MP-aware
-	 */
 	if (params != NULL && narg != 0)
 		error = copyin(params, (caddr_t)args,
 		    (u_int)(narg * sizeof(int)));