* [PATCH 2.6.10-mm2] Fix idle with interrupts disabled (PPC)
@ 2005-01-09 12:22 tglx
0 siblings, 0 replies; only message in thread
From: tglx @ 2005-01-09 12:22 UTC (permalink / raw)
To: trini; +Cc: akpm, mingo, linuxppc-embedded
The idle-thread-preemption-fix.patch in mm1/2 leads to a stalled box
on PPC machines which do not provide a powersave function and therefor
poll the idle loop with interrupts disabled. The patch reenables interrupts.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
idle.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
---
Index: 2.6.10-mm2/arch/ppc/kernel/idle.c
===================================================================
--- 2.6.10-mm2/arch/ppc/kernel/idle.c (revision 141)
+++ 2.6.10-mm2/arch/ppc/kernel/idle.c (working copy)
@@ -41,14 +41,17 @@
if (!need_resched()) {
if (powersave != NULL)
powersave();
+ else {
#ifdef CONFIG_SMP
- else {
set_thread_flag(TIF_POLLING_NRFLAG);
+ local_irq_enable();
while (!need_resched())
barrier();
clear_thread_flag(TIF_POLLING_NRFLAG);
+#else
+ local_irq_enable();
+#endif
}
-#endif
}
if (need_resched())
schedule();
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2005-01-09 12:22 [PATCH 2.6.10-mm2] Fix idle with interrupts disabled (PPC) tglx
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