From: dustinb@codeaurora•org (Dustin Brown)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 1/2] arm: Export save_stack_trace_tsk()
Date: Tue, 13 Jun 2017 11:40:55 -0700 [thread overview]
Message-ID: <20170613184056.23433-1-dustinb@codeaurora.org> (raw)
In-Reply-To: <20170613181603.GE4902@n2100.armlinux.org.uk>
The kernel watchdog is a great debugging tool for finding tasks that
consume a disproportionate amount of CPU time in contiguous chunks. One
can imagine building a similar watchdog for arbitrary driver threads
using save_stack_trace_tsk() and print_stack_trace(). However, this is
not viable for dynamically loaded driver modules on ARM platforms
because save_stack_trace_tsk() is not exported for those architectures.
Export save_stack_trace_tsk() for the ARM architecture to align with x86
and support various debugging use cases such as arbitrary driver thread
watchdog timers.
Signed-off-by: Dustin Brown <dustinb@codeaurora•org>
---
arch/arm/kernel/stacktrace.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/kernel/stacktrace.c b/arch/arm/kernel/stacktrace.c
index 3a2fa203637a..564bb468b7ba 100644
--- a/arch/arm/kernel/stacktrace.c
+++ b/arch/arm/kernel/stacktrace.c
@@ -171,6 +171,7 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
__save_stack_trace(tsk, trace, 1);
}
+EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
void save_stack_trace(struct stack_trace *trace)
{
--
2.12.2
next prev parent reply other threads:[~2017-06-13 18:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-12 22:24 [PATCH] Export save_stack_trace_tsk for ARM and ARM64 Dustin Brown
2017-06-13 8:50 ` Will Deacon
2017-06-13 17:33 ` [PATCH 1/2] arm: Export save_stack_trace_tsk() Dustin Brown
2017-06-13 17:33 ` [PATCH 2/2] arm64: " Dustin Brown
2017-06-13 17:44 ` Will Deacon
2017-06-13 18:16 ` Russell King - ARM Linux
2017-06-13 18:40 ` Dustin Brown [this message]
2017-06-13 18:40 ` Dustin Brown
2017-07-12 18:06 ` [PATCH 1/2] arm: " Dustin Brown
2017-06-14 10:06 ` [PATCH 2/2] arm64: " Will Deacon
2017-06-14 16:51 ` Dustin Brown
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