Apparent, this changeset broke the "nohalt" kernel boot option.
http://www.kernel.org/git/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=8df5a500a3e97f7811cdce0f553ca1917ccd4220
default_idle() is looking at new variable can_do_pal_halt. However,
that variable did not get cleared upon "nohalt" boot option. Resulting
a wacky behavior that the kernel option can only have effect when perfmon
is exercised.
Signed-off-by: Ken Chen <[EMAIL PROTECTED]>
--- linux-2.6.12/arch/ia64/kernel/process.c.orig 2005-08-08
15:05:47.319034969 -0700
+++ linux-2.6.12/arch/ia64/kernel/process.c 2005-08-08 15:05:59.147159824
-0700
@@ -178,7 +178,7 @@ static int can_do_pal_halt = 1;
static int __init nohalt_setup(char * str)
{
- pal_halt = 0;
+ pal_halt = can_do_pal_halt = 0;
return 1;
}
__setup("nohalt", nohalt_setup);
-
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