arch/tile: Miscellaneous cleanup changes.

This commit is primarily changes caused by reviewing "sparse"
and "checkpatch" output on our sources, so is somewhat noisy, since
things like "printk() -> pr_err()" (or whatever) throughout the
codebase tend to get tedious to read.  Rather than trying to tease
apart precisely which things changed due to which type of code
review, this commit includes various cleanups in the code:

- sparse: Add declarations in headers for globals.
- sparse: Fix __user annotations.
- sparse: Using gfp_t consistently instead of int.
- sparse: removing functions not actually used.
- checkpatch: Clean up printk() warnings by using pr_info(), etc.;
  also avoid partial-line printks except in bootup code.
  - checkpatch: Use exposed structs rather than typedefs.
  - checkpatch: Change some C99 comments to C89 comments.

In addition, a couple of minor other changes are rolled in
to this commit:

- Add support for a "raise" instruction to cause SIGFPE, etc., to be raised.
- Remove some compat code that is unnecessary when we fully eliminate
  some of the deprecated syscalls from the generic syscall ABI.
- Update the tile_defconfig to reflect current config contents.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 73 insertions, 59 deletions

diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c
index 934136b61ce..4dd21c1e6d5 100644
--- a/arch/tile/kernel/setup.c
+++ b/arch/tile/kernel/setup.c
@@ -20,6 +20,7 @@
 #include <linux/node.h>
 #include <linux/cpu.h>
 #include <linux/ioport.h>
+#include <linux/irq.h>
 #include <linux/kexec.h>
 #include <linux/pci.h>
 #include <linux/initrd.h>
@@ -109,7 +110,7 @@ static int __init setup_maxmem(char *str)
 
 	maxmem_pfn = (maxmem_mb >> (HPAGE_SHIFT - 20)) <<
 		(HPAGE_SHIFT - PAGE_SHIFT);
-	printk("Forcing RAM used to no more than %dMB\n",
+	pr_info("Forcing RAM used to no more than %dMB\n",
 	       maxmem_pfn >> (20 - PAGE_SHIFT));
 	return 0;
 }
@@ -127,7 +128,7 @@ static int __init setup_maxnodemem(char *str)
 
 	maxnodemem_pfn[node] = (maxnodemem_mb >> (HPAGE_SHIFT - 20)) <<
 		(HPAGE_SHIFT - PAGE_SHIFT);
-	printk("Forcing RAM used on node %ld to no more than %dMB\n",
+	pr_info("Forcing RAM used on node %ld to no more than %dMB\n",
 	       node, maxnodemem_pfn[node] >> (20 - PAGE_SHIFT));
 	return 0;
 }
@@ -140,7 +141,7 @@ static int __init setup_isolnodes(char *str)
 		return -EINVAL;
 
 	nodelist_scnprintf(buf, sizeof(buf), isolnodes);
-	printk("Set isolnodes value to '%s'\n", buf);
+	pr_info("Set isolnodes value to '%s'\n", buf);
 	return 0;
 }
 early_param("isolnodes", setup_isolnodes);
@@ -155,7 +156,7 @@ static int __init setup_pci_reserve(char* str)
 		return -EINVAL;
 
 	pci_reserve_mb = mb;
-	printk("Reserving %dMB for PCIE root complex mappings\n",
+	pr_info("Reserving %dMB for PCIE root complex mappings\n",
 	       pci_reserve_mb);
 	return 0;
 }
@@ -269,7 +270,7 @@ static void *__init setup_pa_va_mapping(void)
  * This is up to 4 mappings for lowmem, one mapping per memory
  * controller, plus one for our text segment.
  */
-void __cpuinit store_permanent_mappings(void)
+static void __cpuinit store_permanent_mappings(void)
 {
 	int i;
 
@@ -320,14 +321,14 @@ static void __init setup_memory(void)
 			break;
 #ifdef CONFIG_FLATMEM
 		if (i > 0) {
-			printk("Can't use discontiguous PAs: %#llx..%#llx\n",
+			pr_err("Can't use discontiguous PAs: %#llx..%#llx\n",
 			       range.size, range.start + range.size);
 			continue;
 		}
 #endif
 #ifndef __tilegx__
 		if ((unsigned long)range.start) {
-			printk("Range not at 4GB multiple: %#llx..%#llx\n",
+			pr_err("Range not at 4GB multiple: %#llx..%#llx\n",
 			       range.start, range.start + range.size);
 			continue;
 		}
@@ -335,51 +336,51 @@ static void __init setup_memory(void)
 		if ((range.start & (HPAGE_SIZE-1)) != 0 ||
 		    (range.size & (HPAGE_SIZE-1)) != 0) {
 			unsigned long long start_pa = range.start;
-			unsigned long long size = range.size;
+			unsigned long long orig_size = range.size;
 			range.start = (start_pa + HPAGE_SIZE - 1) & HPAGE_MASK;
 			range.size -= (range.start - start_pa);
 			range.size &= HPAGE_MASK;
-			printk("Range not hugepage-aligned: %#llx..%#llx:"
+			pr_err("Range not hugepage-aligned: %#llx..%#llx:"
 			       " now %#llx-%#llx\n",
-			       start_pa, start_pa + size,
+			       start_pa, start_pa + orig_size,
 			       range.start, range.start + range.size);
 		}
 		highbits = __pa_to_highbits(range.start);
 		if (highbits >= NR_PA_HIGHBIT_VALUES) {
-			printk("PA high bits too high: %#llx..%#llx\n",
+			pr_err("PA high bits too high: %#llx..%#llx\n",
 			       range.start, range.start + range.size);
 			continue;
 		}
 		if (highbits_seen[highbits]) {
-			printk("Range overlaps in high bits: %#llx..%#llx\n",
+			pr_err("Range overlaps in high bits: %#llx..%#llx\n",
 			       range.start, range.start + range.size);
 			continue;
 		}
 		highbits_seen[highbits] = 1;
 		if (PFN_DOWN(range.size) > maxnodemem_pfn[i]) {
-			int size = maxnodemem_pfn[i];
-			if (size > 0) {
-				printk("Maxnodemem reduced node %d to"
-				       " %d pages\n", i, size);
-				range.size = (HV_PhysAddr)size << PAGE_SHIFT;
+			int max_size = maxnodemem_pfn[i];
+			if (max_size > 0) {
+				pr_err("Maxnodemem reduced node %d to"
+				       " %d pages\n", i, max_size);
+				range.size = PFN_PHYS(max_size);
 			} else {
-				printk("Maxnodemem disabled node %d\n", i);
+				pr_err("Maxnodemem disabled node %d\n", i);
 				continue;
 			}
 		}
 		if (num_physpages + PFN_DOWN(range.size) > maxmem_pfn) {
-			int size = maxmem_pfn - num_physpages;
-			if (size > 0) {
-				printk("Maxmem reduced node %d to %d pages\n",
-				       i, size);
-				range.size = (HV_PhysAddr)size << PAGE_SHIFT;
+			int max_size = maxmem_pfn - num_physpages;
+			if (max_size > 0) {
+				pr_err("Maxmem reduced node %d to %d pages\n",
+				       i, max_size);
+				range.size = PFN_PHYS(max_size);
 			} else {
-				printk("Maxmem disabled node %d\n", i);
+				pr_err("Maxmem disabled node %d\n", i);
 				continue;
 			}
 		}
 		if (i >= MAX_NUMNODES) {
-			printk("Too many PA nodes (#%d): %#llx...%#llx\n",
+			pr_err("Too many PA nodes (#%d): %#llx...%#llx\n",
 			       i, range.size, range.size + range.start);
 			continue;
 		}
@@ -391,7 +392,7 @@ static void __init setup_memory(void)
 #ifndef __tilegx__
 		if (((HV_PhysAddr)end << PAGE_SHIFT) !=
 		    (range.start + range.size)) {
-			printk("PAs too high to represent: %#llx..%#llx\n",
+			pr_err("PAs too high to represent: %#llx..%#llx\n",
 			       range.start, range.start + range.size);
 			continue;
 		}
@@ -412,7 +413,7 @@ static void __init setup_memory(void)
 				NR_CPUS * (PFN_UP(per_cpu_size) >> PAGE_SHIFT);
 			if (end < pci_reserve_end_pfn + percpu_pages) {
 				end = pci_reserve_start_pfn;
-				printk("PCI mapping region reduced node %d to"
+				pr_err("PCI mapping region reduced node %d to"
 				       " %ld pages\n", i, end - start);
 			}
 		}
@@ -456,11 +457,11 @@ static void __init setup_memory(void)
 			}
 		}
 		num_physpages -= dropped_pages;
-		printk(KERN_WARNING "Only using %ldMB memory;"
+		pr_warning("Only using %ldMB memory;"
 		       " ignoring %ldMB.\n",
 		       num_physpages >> (20 - PAGE_SHIFT),
 		       dropped_pages >> (20 - PAGE_SHIFT));
-		printk(KERN_WARNING "Consider using a larger page size.\n");
+		pr_warning("Consider using a larger page size.\n");
 	}
 #endif
 
@@ -478,9 +479,9 @@ static void __init setup_memory(void)
 		MAXMEM_PFN : mappable_physpages;
 	highmem_pages = (long) (num_physpages - lowmem_pages);
 
-	printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
+	pr_notice("%ldMB HIGHMEM available.\n",
 	       pages_to_mb(highmem_pages > 0 ? highmem_pages : 0));
-	printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
+	pr_notice("%ldMB LOWMEM available.\n",
 			pages_to_mb(lowmem_pages));
 #else
 	/* Set max_low_pfn based on what node 0 can directly address. */
@@ -488,15 +489,15 @@ static void __init setup_memory(void)
 
 #ifndef __tilegx__
 	if (node_end_pfn[0] > MAXMEM_PFN) {
-		printk(KERN_WARNING "Only using %ldMB LOWMEM.\n",
+		pr_warning("Only using %ldMB LOWMEM.\n",
 		       MAXMEM>>20);
-		printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
+		pr_warning("Use a HIGHMEM enabled kernel.\n");
 		max_low_pfn = MAXMEM_PFN;
 		max_pfn = MAXMEM_PFN;
 		num_physpages = MAXMEM_PFN;
 		node_end_pfn[0] = MAXMEM_PFN;
 	} else {
-		printk(KERN_NOTICE "%ldMB memory available.\n",
+		pr_notice("%ldMB memory available.\n",
 		       pages_to_mb(node_end_pfn[0]));
 	}
 	for (i = 1; i < MAX_NUMNODES; ++i) {
@@ -512,7 +513,7 @@ static void __init setup_memory(void)
 		if (pages)
 			high_memory = pfn_to_kaddr(node_end_pfn[i]);
 	}
-	printk(KERN_NOTICE "%ldMB memory available.\n",
+	pr_notice("%ldMB memory available.\n",
 	       pages_to_mb(lowmem_pages));
 #endif
 #endif
@@ -744,7 +745,7 @@ static void __init setup_numa_mapping(void)
 	nodes_andnot(default_nodes, node_online_map, isolnodes);
 	if (nodes_empty(default_nodes)) {
 		BUG_ON(!node_isset(0, node_online_map));
-		printk("Forcing NUMA node zero available as a default node\n");
+		pr_err("Forcing NUMA node zero available as a default node\n");
 		node_set(0, default_nodes);
 	}
 
@@ -822,13 +823,13 @@ static void __init setup_numa_mapping(void)
 		printk(KERN_DEBUG "NUMA cpu-to-node row %d:", y);
 		for (x = 0; x < smp_width; ++x, ++cpu) {
 			if (cpu_to_node(cpu) < 0) {
-				printk(" -");
+				pr_cont(" -");
 				cpu_2_node[cpu] = first_node(default_nodes);
 			} else {
-				printk(" %d", cpu_to_node(cpu));
+				pr_cont(" %d", cpu_to_node(cpu));
 			}
 		}
-		printk("\n");
+		pr_cont("\n");
 	}
 }
 
@@ -856,12 +857,17 @@ subsys_initcall(topology_init);
 #endif /* CONFIG_NUMA */
 
 /**
- * setup_mpls() - Allow the user-space code to access various SPRs.
+ * setup_cpu() - Do all necessary per-cpu, tile-specific initialization.
+ * @boot: Is this the boot cpu?
  *
- * Also called from online_secondary().
+ * Called from setup_arch() on the boot cpu, or online_secondary().
  */
-void __cpuinit setup_mpls(void)
+void __cpuinit setup_cpu(int boot)
 {
+	/* The boot cpu sets up its permanent mappings much earlier. */
+	if (!boot)
+		store_permanent_mappings();
+
 	/* Allow asynchronous TLB interrupts. */
 #if CHIP_HAS_TILE_DMA()
 	raw_local_irq_unmask(INT_DMATLB_MISS);
@@ -892,6 +898,14 @@ void __cpuinit setup_mpls(void)
 	 * as well as the PL 0 interrupt mask.
 	 */
 	__insn_mtspr(SPR_MPL_INTCTRL_0_SET_0, 1);
+
+	/* Initialize IRQ support for this cpu. */
+	setup_irq_regs();
+
+#ifdef CONFIG_HARDWALL
+	/* Reset the network state on this cpu. */
+	reset_network_state();
+#endif
 }
 
 static int __initdata set_initramfs_file;
@@ -922,22 +936,22 @@ static void __init load_hv_initrd(void)
 	fd = hv_fs_findfile((HV_VirtAddr) initramfs_file);
 	if (fd == HV_ENOENT) {
 		if (set_initramfs_file)
-			printk("No such hvfs initramfs file '%s'\n",
-			       initramfs_file);
+			pr_warning("No such hvfs initramfs file '%s'\n",
+				   initramfs_file);
 		return;
 	}
 	BUG_ON(fd < 0);
 	stat = hv_fs_fstat(fd);
 	BUG_ON(stat.size < 0);
 	if (stat.flags & HV_FS_ISDIR) {
-		printk("Ignoring hvfs file '%s': it's a directory.\n",
-		       initramfs_file);
+		pr_warning("Ignoring hvfs file '%s': it's a directory.\n",
+			   initramfs_file);
 		return;
 	}
 	initrd = alloc_bootmem_pages(stat.size);
 	rc = hv_fs_pread(fd, (HV_VirtAddr) initrd, stat.size, 0);
 	if (rc != stat.size) {
-		printk("Error reading %d bytes from hvfs file '%s': %d\n",
+		pr_err("Error reading %d bytes from hvfs file '%s': %d\n",
 		       stat.size, initramfs_file, rc);
 		free_bootmem((unsigned long) initrd, stat.size);
 		return;
@@ -966,9 +980,9 @@ static void __init validate_hv(void)
 	HV_Topology topology = hv_inquire_topology();
 	BUG_ON(topology.coord.x != 0 || topology.coord.y != 0);
 	if (topology.width != 1 || topology.height != 1) {
-		printk("Warning: booting UP kernel on %dx%d grid;"
-		       " will ignore all but first tile.\n",
-		       topology.width, topology.height);
+		pr_warning("Warning: booting UP kernel on %dx%d grid;"
+			   " will ignore all but first tile.\n",
+			   topology.width, topology.height);
 	}
 #endif
 
@@ -1004,7 +1018,7 @@ static void __init validate_hv(void)
 
 	if (hv_confstr(HV_CONFSTR_CHIP_MODEL, (HV_VirtAddr)chip_model,
 		       sizeof(chip_model)) < 0) {
-		printk("Warning: HV_CONFSTR_CHIP_MODEL not available\n");
+		pr_err("Warning: HV_CONFSTR_CHIP_MODEL not available\n");
 		strlcpy(chip_model, "unknown", sizeof(chip_model));
 	}
 }
@@ -1096,7 +1110,7 @@ static int __init disabled_cpus(char *str)
 	if (str == NULL || cpulist_parse_crop(str, &disabled_map) != 0)
 		return -EINVAL;
 	if (cpumask_test_cpu(boot_cpu, &disabled_map)) {
-		printk("disabled_cpus: can't disable boot cpu %d\n", boot_cpu);
+		pr_err("disabled_cpus: can't disable boot cpu %d\n", boot_cpu);
 		cpumask_clear_cpu(boot_cpu, &disabled_map);
 	}
 	return 0;
@@ -1104,12 +1118,12 @@ static int __init disabled_cpus(char *str)
 
 early_param("disabled_cpus", disabled_cpus);
 
-void __init print_disabled_cpus()
+void __init print_disabled_cpus(void)
 {
 	if (!cpumask_empty(&disabled_map)) {
 		char buf[100];
 		cpulist_scnprintf(buf, sizeof(buf), &disabled_map);
-		printk(KERN_INFO "CPUs not available for Linux: %s\n", buf);
+		pr_info("CPUs not available for Linux: %s\n", buf);
 	}
 }
 
@@ -1162,7 +1176,7 @@ static void __init setup_cpu_maps(void)
 			      (HV_VirtAddr) cpumask_bits(&cpu_lotar_map),
 			      sizeof(cpu_lotar_map));
 	if (rc < 0) {
-		printk("warning: no HV_INQ_TILES_LOTAR; using AVAIL\n");
+		pr_err("warning: no HV_INQ_TILES_LOTAR; using AVAIL\n");
 		cpu_lotar_map = cpu_possible_map;
 	}
 
@@ -1182,7 +1196,7 @@ static void __init setup_cpu_maps(void)
 
 static int __init dataplane(char *str)
 {
-	printk("WARNING: dataplane support disabled in this kernel\n");
+	pr_warning("WARNING: dataplane support disabled in this kernel\n");
 	return 0;
 }
 
@@ -1200,8 +1214,8 @@ void __init setup_arch(char **cmdline_p)
 	len = hv_get_command_line((HV_VirtAddr) boot_command_line,
 				  COMMAND_LINE_SIZE);
 	if (boot_command_line[0])
-		printk("WARNING: ignoring dynamic command line \"%s\"\n",
-		       boot_command_line);
+		pr_warning("WARNING: ignoring dynamic command line \"%s\"\n",
+			   boot_command_line);
 	strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 #else
 	char *hv_cmdline;
@@ -1269,7 +1283,7 @@ void __init setup_arch(char **cmdline_p)
 	setup_numa_mapping();
 	zone_sizes_init();
 	set_page_homes();
-	setup_mpls();
+	setup_cpu(1);
 	setup_clock();
 	load_hv_initrd();
 }