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, 22 insertions, 21 deletions

diff --git a/arch/tile/kernel/stack.c b/arch/tile/kernel/stack.c
index 382170b4b40a..b6268d3ae869 100644
--- a/arch/tile/kernel/stack.c
+++ b/arch/tile/kernel/stack.c
@@ -56,13 +56,16 @@ static int valid_address(struct KBacktraceIterator *kbt, VirtualAddress address)
 	HV_PTE pte;
 	struct page *page;
 
+	if (l1_pgtable == NULL)
+		return 0;	/* can't read user space in other tasks */
+
 	pte = l1_pgtable[HV_L1_INDEX(address)];
 	if (!hv_pte_get_present(pte))
 		return 0;
 	pfn = hv_pte_get_pfn(pte);
 	if (pte_huge(pte)) {
 		if (!pfn_valid(pfn)) {
-			printk(KERN_ERR "huge page has bad pfn %#lx\n", pfn);
+			pr_err("huge page has bad pfn %#lx\n", pfn);
 			return 0;
 		}
 		return hv_pte_get_present(pte) && hv_pte_get_readable(pte);
@@ -70,7 +73,7 @@ static int valid_address(struct KBacktraceIterator *kbt, VirtualAddress address)
 
 	page = pfn_to_page(pfn);
 	if (PageHighMem(page)) {
-		printk(KERN_ERR "L2 page table not in LOWMEM (%#llx)\n",
+		pr_err("L2 page table not in LOWMEM (%#llx)\n",
 		       HV_PFN_TO_CPA(pfn));
 		return 0;
 	}
@@ -91,13 +94,12 @@ static bool read_memory_func(void *result, VirtualAddress address,
 		/* We only tolerate kernel-space reads of this task's stack */
 		if (!in_kernel_stack(kbt, address))
 			return 0;
-	} else if (kbt->pgtable == NULL) {
-		return 0;	/* can't read user space in other tasks */
 	} else if (!valid_address(kbt, address)) {
 		return 0;	/* invalid user-space address */
 	}
 	pagefault_disable();
-	retval = __copy_from_user_inatomic(result, (const void *)address,
+	retval = __copy_from_user_inatomic(result,
+					   (void __user __force *)address,
 					   size);
 	pagefault_enable();
 	return (retval == 0);
@@ -131,14 +133,14 @@ static struct pt_regs *valid_fault_handler(struct KBacktraceIterator* kbt)
 	    in_kernel_stack(kbt, p->sp) &&
 	    p->sp >= sp) {
 		if (kbt->verbose)
-			printk(KERN_ERR "  <%s while in kernel mode>\n", fault);
+			pr_err("  <%s while in kernel mode>\n", fault);
 	} else if (EX1_PL(p->ex1) == USER_PL &&
 	    p->pc < PAGE_OFFSET &&
 	    p->sp < PAGE_OFFSET) {
 		if (kbt->verbose)
-			printk(KERN_ERR "  <%s while in user mode>\n", fault);
+			pr_err("  <%s while in user mode>\n", fault);
 	} else if (kbt->verbose) {
-		printk(KERN_ERR "  (odd fault: pc %#lx, sp %#lx, ex1 %#lx?)\n",
+		pr_err("  (odd fault: pc %#lx, sp %#lx, ex1 %#lx?)\n",
 		       p->pc, p->sp, p->ex1);
 		p = NULL;
 	}
@@ -166,13 +168,13 @@ static struct pt_regs *valid_sigframe(struct KBacktraceIterator* kbt)
 		if (!valid_address(kbt, b->sp) ||
 		    !valid_address(kbt, sigframe_top)) {
 			if (kbt->verbose)
-				printk("  (odd signal: sp %#lx?)\n",
+				pr_err("  (odd signal: sp %#lx?)\n",
 				       (unsigned long)(b->sp));
 			return NULL;
 		}
 		frame = (struct rt_sigframe *)b->sp;
 		if (kbt->verbose) {
-			printk(KERN_ERR "  <received signal %d>\n",
+			pr_err("  <received signal %d>\n",
 			       frame->info.si_signo);
 		}
 		return &frame->uc.uc_mcontext.regs;
@@ -180,7 +182,7 @@ static struct pt_regs *valid_sigframe(struct KBacktraceIterator* kbt)
 	return NULL;
 }
 
-int KBacktraceIterator_is_sigreturn(struct KBacktraceIterator *kbt)
+static int KBacktraceIterator_is_sigreturn(struct KBacktraceIterator *kbt)
 {
 	return is_sigreturn(kbt->it.pc);
 }
@@ -231,13 +233,13 @@ static void validate_stack(struct pt_regs *regs)
 	unsigned long sp = stack_pointer;
 
 	if (EX1_PL(regs->ex1) == KERNEL_PL && regs->sp >= ksp0) {
-		printk("WARNING: cpu %d: kernel stack page %#lx underrun!\n"
+		pr_err("WARNING: cpu %d: kernel stack page %#lx underrun!\n"
 		       "  sp %#lx (%#lx in caller), caller pc %#lx, lr %#lx\n",
 		       cpu, ksp0_base, sp, regs->sp, regs->pc, regs->lr);
 	}
 
 	else if (sp < ksp0_base + sizeof(struct thread_info)) {
-		printk("WARNING: cpu %d: kernel stack page %#lx overrun!\n"
+		pr_err("WARNING: cpu %d: kernel stack page %#lx overrun!\n"
 		       "  sp %#lx (%#lx in caller), caller pc %#lx, lr %#lx\n",
 		       cpu, ksp0_base, sp, regs->sp, regs->pc, regs->lr);
 	}
@@ -280,7 +282,7 @@ void KBacktraceIterator_init(struct KBacktraceIterator *kbt,
 			if (!PageHighMem(page))
 				kbt->pgtable = __va(pgdir_pa);
 			else
-				printk(KERN_ERR "page table not in LOWMEM"
+				pr_err("page table not in LOWMEM"
 				       " (%#llx)\n", pgdir_pa);
 		}
 		local_flush_tlb_all();
@@ -288,13 +290,12 @@ void KBacktraceIterator_init(struct KBacktraceIterator *kbt,
 	}
 
 	if (regs == NULL) {
-		extern const void *get_switch_to_pc(void);
 		if (is_current || t->state == TASK_RUNNING) {
 			/* Can't do this; we need registers */
 			kbt->end = 1;
 			return;
 		}
-		pc = (ulong) get_switch_to_pc();
+		pc = get_switch_to_pc();
 		lr = t->thread.pc;
 		sp = t->thread.ksp;
 		r52 = 0;
@@ -344,8 +345,8 @@ void tile_show_stack(struct KBacktraceIterator *kbt, int headers)
 		 * then bust_spinlocks() spit out a space in front of us
 		 * and it will mess up our KERN_ERR.
 		 */
-		printk("\n");
-		printk(KERN_ERR "Starting stack dump of tid %d, pid %d (%s)"
+		pr_err("\n");
+		pr_err("Starting stack dump of tid %d, pid %d (%s)"
 		       " on cpu %d at cycle %lld\n",
 		       kbt->task->pid, kbt->task->tgid, kbt->task->comm,
 		       smp_processor_id(), get_cycles());
@@ -385,17 +386,17 @@ void tile_show_stack(struct KBacktraceIterator *kbt, int headers)
 			namebuf[sizeof(namebuf)-1] = '\0';
 		}
 
-		printk(KERN_ERR "  frame %d: 0x%lx %s(sp 0x%lx)\n",
+		pr_err("  frame %d: 0x%lx %s(sp 0x%lx)\n",
 		       i++, address, namebuf, (unsigned long)(kbt->it.sp));
 
 		if (i >= 100) {
-			printk(KERN_ERR "Stack dump truncated"
+			pr_err("Stack dump truncated"
 			       " (%d frames)\n", i);
 			break;
 		}
 	}
 	if (headers)
-		printk(KERN_ERR "Stack dump complete\n");
+		pr_err("Stack dump complete\n");
 }
 EXPORT_SYMBOL(tile_show_stack);