remove some unused kernel global vars

diff --git sys/arch/amd64/amd64/machdep.c sys/arch/amd64/amd64/machdep.c
index 7bf57a406cd..d256767d24c 100644
--- sys/arch/amd64/amd64/machdep.c
+++ sys/arch/amd64/amd64/machdep.c
@@ -178,10 +178,7 @@ int biosbasemem = 0;		/* base memory reported by BIOS */
 u_int bootapiver = 0;		/* /boot API version */
 
 int	physmem;
-u_int64_t	dumpmem_low;
-u_int64_t	dumpmem_high;
 extern int	boothowto;
-int	cpu_class;
 
 paddr_t	dumpmem_paddr;
 vaddr_t	dumpmem_vaddr;
diff --git sys/arch/i386/i386/machdep.c sys/arch/i386/i386/machdep.c
index 2599def386c..919c9b3f7af 100644
--- sys/arch/i386/i386/machdep.c
+++ sys/arch/i386/i386/machdep.c
@@ -191,9 +191,6 @@ int	dumpsize = 0;		/* pages */
 long	dumplo = 0;		/* blocks */
 
 int	cpu_class;
-int	i386_fpu_present;
-int	i386_fpu_exception;
-int	i386_fpu_fdivbug;
 
 int	i386_use_fxsave;
 int	i386_has_sse;
@@ -207,7 +204,6 @@ struct vm_map *exec_map = NULL;
 struct vm_map *phys_map = NULL;
 
 #if !defined(SMALL_KERNEL)
-int p4_model;
 int p3_early;
 void (*update_cpuspeed)(void) = NULL;
 void	via_update_sensor(void *args);
@@ -1547,7 +1543,6 @@ intel686_p4_cpu_setup(struct cpu_info *ci)
 	intel686_common_cpu_setup(ci);
 
 #if !defined(SMALL_KERNEL)
-	p4_model = (ci->ci_signature >> 4) & 15;
 	update_cpuspeed = p4_update_cpuspeed;
 #endif
 }
diff --git sys/arch/i386/isa/npx.c sys/arch/i386/isa/npx.c
index 5e354d5d625..fae282d5496 100644
--- sys/arch/i386/isa/npx.c
+++ sys/arch/i386/isa/npx.c
@@ -132,10 +132,6 @@ static	volatile u_int		npx_intrs_while_probing
 static	volatile u_int		npx_traps_while_probing
 				    __attribute__((section(".kudata")));
 
-extern int i386_fpu_present;
-extern int i386_fpu_exception;
-extern int i386_fpu_fdivbug;
-
 #define fxsave(addr)		__asm("fxsave %0" : "=m" (*addr))
 #define fxrstor(addr)		__asm("fxrstor %0" : : "m" (*addr))
 #define ldmxcsr(addr)		__asm("ldmxcsr %0" : : "m" (*addr))
@@ -235,7 +231,6 @@ npxprobe1(struct isa_attach_args *ia)
 				 */
 				npx_type = NPX_EXCEPTION;
 				ia->ia_irq = IRQUNK;	/* zap the interrupt */
-				i386_fpu_exception = 1;
 			} else if (npx_intrs_while_probing != 0) {
 				/*
 				 * Bad, we are stuck with IRQ13.
@@ -278,7 +273,6 @@ npxprobe(struct device *parent, void *match, void *aux)
 
 	if (cpu_feature & CPUID_FPU) {
 		npx_type = NPX_CPUID;
-		i386_fpu_exception = 1;
 		ia->ia_irq = IRQUNK;	/* Don't want the interrupt vector */
 		ia->ia_iosize = 16;
 		ia->ia_msize = 0;
@@ -348,7 +342,6 @@ npxinit(struct cpu_info *ci)
 	lcr0(rcr0() & ~(CR0_EM|CR0_TS));
 	fninit();
 	if (npx586bug1(4195835, 3145727) != 0) {
-		i386_fpu_fdivbug = 1;
 		printf("%s: WARNING: Pentium FDIV bug detected!\n",
 		    ci->ci_dev->dv_xname);
 	}
@@ -397,7 +390,6 @@ npxattach(struct device *parent, struct device *self, void *aux)
 	}
 
 	npxinit(&cpu_info_primary);
-	i386_fpu_present = 1;
 
 	if (i386_use_fxsave)
 		npxdna_func = npxdna_xmm;
diff --git sys/arch/i386/pci/pcibios.c sys/arch/i386/pci/pcibios.c
index 36f19fbfd31..ab2337187f4 100644
--- sys/arch/i386/pci/pcibios.c
+++ sys/arch/i386/pci/pcibios.c
@@ -101,7 +101,6 @@
 #include <machine/biosvar.h>
 
 int pcibios_flags;
-int pcibios_present;
 
 struct pcibios_pir_header pcibios_pir_header;
 struct pcibios_intr_routing *pcibios_pir_table;
@@ -187,8 +186,6 @@ pcibiosattach(struct device *parent, struct device *self, void *aux)
 	 */
 	pci_mode = mech1 ? 1 : 2;
 
-	pcibios_present = 1;
-
 	/*
 	 * Find the PCI IRQ Routing table.
 	 */
diff --git sys/dev/ic/ac97.c sys/dev/ic/ac97.c
index 89b82a9fee5..c56d016c799 100644
--- sys/dev/ic/ac97.c
+++ sys/dev/ic/ac97.c
@@ -69,17 +69,6 @@
 #include <dev/audio_if.h>
 #include <dev/ic/ac97.h>
 
-
-/* default parameters; supported by all ac97 codecs */
-const struct audio_params ac97_audio_default = {
-	48000,		/* sample_rate */
-	AUDIO_ENCODING_SLINEAR_LE, /* encoding */
-	16,		/* precision */
-	2,		/* bps */
-	1,		/* msb */
-	2		/* channels */
-};
-
 const struct audio_mixer_enum ac97_on_off = {
 	2,
 	{ { { AudioNoff } , 0 },
diff --git sys/netmpls/mpls_raw.c sys/netmpls/mpls_raw.c
index 8aaaf757cde..d0785e95377 100644
--- sys/netmpls/mpls_raw.c
+++ sys/netmpls/mpls_raw.c
@@ -45,8 +45,6 @@
 #include <netmpls/mpls.h>
 
 int mpls_defttl = 255;
-int mpls_push_expnull_ip = 0;
-int mpls_push_expnull_ip6 = 0;
 int mpls_mapttl_ip = 1;
 int mpls_mapttl_ip6 = 0;