Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f3a9022fd187de41a04de9c5b44ff40e68c6d661
Commit: f3a9022fd187de41a04de9c5b44ff40e68c6d661
Parent: 69d87daa18aced7f494bc1d5a977b063bbbdffbd
Author: Paul Mundt <[EMAIL PROTECTED]>
AuthorDate: Mon May 14 19:39:48 2007 +0900
Committer: Paul Mundt <[EMAIL PROTECTED]>
CommitDate: Mon May 21 14:34:25 2007 +0900
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 <[EMAIL PROTECTED]>
---
arch/sh/kernel/process.c | 33 +++++++++++++++++++++++++++------
1 files changed, 27 insertions(+), 6 deletions(-)
diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
index 6b4f574..a11e2aa 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;
-
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