pmap: Do not use PMAP_LOCK_INIT with kernel_pmap

The kernel_pmap lock is a bit special: it does not need the DUPOK flag,
and it really belongs to a different lock class.  If it belongs to the
same class as regular pmap locks, then witness may report warnings when
performing UMA allocations under a regular pmap lock, if the allocation
triggers a pmap_growkernel() call.

Replace instances of PMAP_LOCK_INIT(kernel_pmap) with inline mtx_init()
calls to silence some witness warnings for harmless behaviour I see with
some uncommitted test programs.

Reviewed by:	alc, kib
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D56185

sys/amd64/amd64/pmap.c

@@ -2127,7 +2127,7 @@ pmap_bootstrap(vm_paddr_t *firstaddr)
 	 * DMAP_TO_PHYS()/PHYS_TO_DMAP() are functional only after
 	 * kva_layout is fixed.
 	 */
-	PMAP_LOCK_INIT(kernel_pmap);
+	mtx_init(&kernel_pmap->pm_mtx, "kernel pmap", NULL, MTX_DEF);
 	if (la57) {
 		kva_layout = kva_layout_la57;
 		vtoptem = ((1ul << (NPTEPGSHIFT + NPDEPGSHIFT + NPDPEPGSHIFT +

sys/arm/arm/pmap-v6.c

@@ -1173,7 +1173,7 @@ pmap_bootstrap(vm_offset_t firstaddr)
 	/*
 	 * Initialize the kernel pmap (which is statically allocated).
 	 */
-	PMAP_LOCK_INIT(kernel_pmap);
+	mtx_init(&kernel_pmap->pm_mtx, "kernel pmap", NULL, MTX_DEF);
 	kernel_l1pa = (vm_paddr_t)kern_pt1;  /* for libkvm */
 	kernel_pmap->pm_pt1 = kern_pt1;
 	kernel_pmap->pm_pt2tab = kern_pt2tab;

sys/arm64/arm64/pmap.c

@@ -1347,7 +1347,7 @@ pmap_bootstrap(void)
 
 	/* Set this early so we can use the pagetable walking functions */
 	kernel_pmap_store.pm_l0 = pagetable_l0_ttbr1;
-	PMAP_LOCK_INIT(kernel_pmap);
+	mtx_init(&kernel_pmap->pm_mtx, "kernel pmap", NULL, MTX_DEF);
 	kernel_pmap->pm_l0_paddr =
 	    pmap_early_vtophys((vm_offset_t)kernel_pmap_store.pm_l0);
 	TAILQ_INIT(&kernel_pmap->pm_pvchunk);

sys/i386/i386/pmap.c

@@ -630,7 +630,7 @@ __CONCAT(PMTYPE, bootstrap)(vm_paddr_t firstaddr)
 	 * Count bootstrap data as being resident in case any of this data is
 	 * later unmapped (using pmap_remove()) and freed.
 	 */
-	PMAP_LOCK_INIT(kernel_pmap);
+	mtx_init(&kernel_pmap->pm_mtx, "kernel pmap", NULL, MTX_DEF);
 	kernel_pmap->pm_pdir = IdlePTD;
 #ifdef PMAP_PAE_COMP
 	kernel_pmap->pm_pdpt = IdlePDPT;

sys/powerpc/aim/mmu_oea.c

@@ -878,7 +878,7 @@ moea_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
 	/*
 	 * Initialize the kernel pmap (which is statically allocated).
 	 */
-	PMAP_LOCK_INIT(kernel_pmap);
+	mtx_init(&kernel_pmap->pm_mtx, "kernel pmap", NULL, MTX_DEF);
 	for (i = 0; i < 16; i++)
 		kernel_pmap->pm_sr[i] = EMPTY_SEGMENT + i;
 	CPU_FILL(&kernel_pmap->pm_active);

sys/powerpc/aim/mmu_oea64.c

@@ -1089,7 +1089,7 @@ moea64_mid_bootstrap(vm_offset_t kernelstart, vm_offset_t kernelend)
 	CPU_FILL(&kernel_pmap->pm_active);
 	RB_INIT(&kernel_pmap->pmap_pvo);
 
-	PMAP_LOCK_INIT(kernel_pmap);
+	mtx_init(&kernel_pmap->pm_mtx, "kernel pmap", NULL, MTX_DEF);
 
 	/*
 	 * Now map in all the other buffers we allocated earlier

sys/powerpc/aim/mmu_radix.c

@@ -1842,7 +1842,7 @@ mmu_radix_setup_pagetables(vm_size_t hwphyssz)
 	vm_paddr_t l1phys;
 
 	bzero(kernel_pmap, sizeof(struct pmap));
-	PMAP_LOCK_INIT(kernel_pmap);
+	mtx_init(&kernel_pmap->pm_mtx, "kernel pmap", NULL, MTX_DEF);
 	vm_radix_init(&kernel_pmap->pm_radix);
 
 	ptpages = allocpages(3);

sys/powerpc/booke/pmap.c

@@ -901,7 +901,7 @@ mmu_booke_bootstrap(vm_offset_t start, vm_offset_t kernelend)
 	/*******************************************************/
 	/* Initialize (statically allocated) kernel pmap. */
 	/*******************************************************/
-	PMAP_LOCK_INIT(kernel_pmap);
+	mtx_init(&kernel_pmap->pm_mtx, "kernel pmap", NULL, MTX_DEF);
 
 	debugf("kernel_pmap = 0x%"PRI0ptrX"\n", (uintptr_t)kernel_pmap);
 	kernel_pte_alloc(virtual_avail, kernstart);

sys/riscv/riscv/pmap.c

@@ -921,7 +921,7 @@ pmap_bootstrap(vm_paddr_t kernstart, vm_size_t kernlen)
 
 	printf("pmap_bootstrap %lx %lx\n", kernstart, kernlen);
 
-	PMAP_LOCK_INIT(kernel_pmap);
+	mtx_init(&kernel_pmap->pm_mtx, "kernel pmap", NULL, MTX_DEF);
 	TAILQ_INIT(&kernel_pmap->pm_pvchunk);
 	vm_radix_init(&kernel_pmap->pm_root);