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authorPaul Mundt <lethal@linux-sh.org>2007-05-14 19:39:48 +0900
committerPaul Mundt <lethal@linux-sh.org>2007-05-21 14:34:25 +0900
commitf3a9022fd187de41a04de9c5b44ff40e68c6d661 (patch)
tree352fd4f2bc35469721a218093bf4e65a6c1d9209 /arch/sh/kernel
parent69d87daa18aced7f494bc1d5a977b063bbbdffbd (diff)
downloadlinux-2.6.34-ux500-f3a9022fd187de41a04de9c5b44ff40e68c6d661.tar.gz
sh: sr.bl toggling around idle sleep.
As pointed out by Saito-san, without the sr.bl manipulation we can occasionally hit delays in the idle loop due to interrupt handling, so ensure that interrupts are blocked before going to sleep. At the same time, we throw in TIF_POLLING_NRFLAG for the !hlt_counter case (primarily used by the ST-40 parts). Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel')
-rw-r--r--arch/sh/kernel/process.c33
1 files changed, 27 insertions, 6 deletions
diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
index 6b4f5748d0b..a11e2aa73cb 100644
--- a/arch/sh/kernel/process.c
+++ b/arch/sh/kernel/process.c
@@ -26,8 +26,6 @@
static int hlt_counter;
int ubc_usercnt = 0;
-#define HARD_IDLE_TIMEOUT (HZ / 3)
-
void (*pm_idle)(void);
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
@@ -44,16 +42,39 @@ void enable_hlt(void)
}
EXPORT_SYMBOL(enable_hlt);
+static int __init nohlt_setup(char *__unused)
+{
+ hlt_counter = 1;
+ return 1;
+}
+__setup("nohlt", nohlt_setup);
+
+static int __init hlt_setup(char *__unused)
+{
+ hlt_counter = 0;
+ return 1;
+}
+__setup("hlt", hlt_setup);
+
void default_idle(void)
{
- if (!hlt_counter)
- cpu_sleep();
- else
- cpu_relax();
+ if (!hlt_counter) {
+ clear_thread_flag(TIF_POLLING_NRFLAG);
+ smp_mb__after_clear_bit();
+ set_bl_bit();
+ while (!need_resched())
+ cpu_sleep();
+ clear_bl_bit();
+ set_thread_flag(TIF_POLLING_NRFLAG);
+ } else
+ while (!need_resched())
+ cpu_relax();
}
void cpu_idle(void)
{
+ set_thread_flag(TIF_POLLING_NRFLAG);
+
/* endless idle loop with no priority at all */
while (1) {
void (*idle)(void) = pm_idle;