[patch] fix sparc64 cpu_idle()

[Coywolf Qi Hunt <coywolf@gmail.com>]

On Mon, 27 Dec 2004 08:08:48 -0800, William Lee Irwin III
<wli@holomorphy.com> wrote:
> On Mon, Dec 27, 2004 at 07:10:38PM +0300, Oleg Nesterov wrote:
> > cpu_idle() declared/defined in
> > init/main.c:                          void cpu_idle(void)
> > i386/kernel/process.c                 void cpu_idle(void)
> > i386/kernel/smpboot.c:                int  cpu_idle(void)
> > i386/mach-voyager/voyager_smp.c:      int  cpu_idle(void)
> > ppc/kernel/idle.c:                    int  cpu_idle(void)
> > ppc/kernel/smp.c:                     int  cpu_idle(void *unused)
> > ppc64/kernel/idle.c:                  int  cpu_idle(void)
> > ppc64/kernel/smp.c:                   int  cpu_idle(void *unused)
> > sparc/kernel/process.c:               int  cpu_idle(void)
> > sparc64/kernel/process.c:             int  cpu_idle(void)
> > sh/kernel/process.c:                  void cpu_idle(void *unused)
> > sh/kernel/smp.c:                      int  cpu_idle(void *unused)
> > ia64/kernel/smpboot.c:                int  cpu_idle(void)
> > ia64/kernel/process.c:                void cpu_idle(void *unused)
> 
> It's remarkable that several arches are internally inconsistent. Anyway,
> this will likely be a shoo-in, as it removes more code than it adds. The
> mess surrounding cpu_idle() has been aggravating for some time.


It's not flexible to enforce  'void cpu_idle(void)'  all over. What If
someday someone would want cpu_idle() to return value for some arch.


Currently sparch64's UP cpu_idel() returns -EPERM. This is paranoia. 

Signed-off-by: Coywolf Qi Hunt <coywolf@gmail.com>
diff -Nurp 2.6.10/arch/sparc64/kernel/process.c
2.6.10-cy/arch/sparc64/kernel/process.c
--- 2.6.10/arch/sparc64/kernel/process.c	2004-12-30 02:52:40.000000000 +0800
+++ 2.6.10-cy/arch/sparc64/kernel/process.c	2004-12-30 02:57:40.000000000 +0800
@@ -60,11 +60,8 @@ void default_idle(void)
 /*
  * the idle loop on a Sparc... ;)
  */
-int cpu_idle(void)
+void cpu_idle(void)
 {
-	if (current->pid != 0)
-		return -EPERM;
-
 	/* endless idle loop with no priority at all */
 	for (;;) {
 		/* If current->work.need_resched is zero we should really
@@ -80,7 +77,6 @@ int cpu_idle(void)
 		schedule();
 		check_pgt_cache();
 	}
-	return 0;
 }
 
 #else

-- 
Coywolf Qi Hunt
Homepage http://sosdg.org/~coywolf/