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, 7 insertions, 1 deletions

diff --git a/arch/tile/include/asm/thread_info.h b/arch/tile/include/asm/thread_info.h
index 9024bf3530aa..beec8729564a 100644
--- a/arch/tile/include/asm/thread_info.h
+++ b/arch/tile/include/asm/thread_info.h
@@ -55,7 +55,7 @@ struct thread_info {
 	.restart_block	= {			\
 		.fn = do_no_restart_syscall,	\
 	},					\
-	.step_state	= 0,			\
+	.step_state	= NULL,			\
 }
 
 #define init_thread_info	(init_thread_union.thread_info)
@@ -86,6 +86,12 @@ register unsigned long stack_pointer __asm__("sp");
 extern struct thread_info *alloc_thread_info(struct task_struct *task);
 extern void free_thread_info(struct thread_info *info);
 
+/* Sit on a nap instruction until interrupted. */
+extern void smp_nap(void);
+
+/* Enable interrupts racelessly and nap forever: helper for cpu_idle(). */
+extern void _cpu_idle(void);
+
 /* Switch boot idle thread to a freshly-allocated stack and free old stack. */
 extern void cpu_idle_on_new_stack(struct thread_info *old_ti,
 				  unsigned long new_sp,