Philippe Gerum wrote:
> We had a couple of brown paper bag issues in v2.4.9, particularly in the
> interrupt pipeline for the ARM port, but also a time conversion bug
> which basically affects any architecture with high frequency CPUs
> (x86-ers, this one is for you).
A note for users of Xenomai on the ARM architecture.
A newly added check in Xenomai 2.4.9 allowed us to find a bug in the
I-pipe patch for ARM, which is actually there since the
adeos-ipipe-2.6.19-arm-1.7-00 patch. If you are using the 2.4 branch,
please upgrade to the 2.4.9.1 release.
If you are using an earlier branch, the only thing we can suggest is a
patch which you should apply to the I-pipe patched kernel:
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index e2b0c3c..e77a017 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -217,7 +217,8 @@ extern struct task_struct *__switch_to(struct task_struct *,
do { \
local_irq_disable_hw_cond();\
last = __switch_to(prev,task_thread_info(prev), task_thread_info(next));
- local_irq_enable_hw_cond(); \
+ if (ipipe_root_domain_p) \
+ local_irq_enable_hw_cond(); \
} while (0)
#if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
Or, for older kernels:
diff --git a/include/asm-arm/system.h b/include/asm-arm/system.h
index e2b0c3c..e77a017 100644
--- a/include/asm-arm/system.h
+++ b/include/asm-arm/system.h
@@ -217,7 +217,8 @@ extern struct task_struct *__switch_to(struct task_struct *,
do { \
local_irq_disable_hw_cond();\
last = __switch_to(prev,task_thread_info(prev), task_thread_info(next));
- local_irq_enable_hw_cond(); \
+ if (ipipe_root_domain_p) \
+ local_irq_enable_hw_cond(); \
} while (0)
#if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
--
Gilles
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