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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-02-26 14:54:56 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-02-29 09:53:10 +0100 |
| commit | f904f58263e1df5f70feb8b283f4bbe662847334 (patch) | |
| tree | 41c09804a0ee0617cfc32d196709088d9ec2e914 /include/linux | |
| parent | ff9a9b4c4334b53b52ee9279f30bd5dd92ea9bdd (diff) | |
| download | linux-stable-f904f58263e1df5f70feb8b283f4bbe662847334.tar.gz linux-stable-f904f58263e1df5f70feb8b283f4bbe662847334.tar.bz2 linux-stable-f904f58263e1df5f70feb8b283f4bbe662847334.zip | |
sched/debug: Fix preempt_disable_ip recording for preempt_disable()
The preempt_disable() invokes preempt_count_add() which saves the caller
in ->preempt_disable_ip. It uses CALLER_ADDR1 which does not look for
its caller but for the parent of the caller. Which means we get the correct
caller for something like spin_lock() unless the architectures inlines
those invocations. It is always wrong for preempt_disable() or
local_bh_disable().
This patch makes the function get_lock_parent_ip() which tries
CALLER_ADDR0,1,2 if the former is a locking function.
This seems to record the preempt_disable() caller properly for
preempt_disable() itself as well as for get_cpu_var() or
local_bh_disable().
Steven asked for the get_parent_ip() -> get_lock_parent_ip() rename.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160226135456.GB18244@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/ftrace.h | 12 | ||||
| -rw-r--r-- | include/linux/sched.h | 2 |
2 files changed, 12 insertions, 2 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index c2b340e23f62..6d9df3f7e334 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -713,6 +713,18 @@ static inline void __ftrace_enabled_restore(int enabled) #define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5)) #define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6)) +static inline unsigned long get_lock_parent_ip(void) +{ + unsigned long addr = CALLER_ADDR0; + + if (!in_lock_functions(addr)) + return addr; + addr = CALLER_ADDR1; + if (!in_lock_functions(addr)) + return addr; + return CALLER_ADDR2; +} + #ifdef CONFIG_IRQSOFF_TRACER extern void time_hardirqs_on(unsigned long a0, unsigned long a1); extern void time_hardirqs_off(unsigned long a0, unsigned long a1); diff --git a/include/linux/sched.h b/include/linux/sched.h index 87e5f9886ac8..9519b66fc21f 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -182,8 +182,6 @@ extern void update_cpu_load_nohz(int active); static inline void update_cpu_load_nohz(int active) { } #endif -extern unsigned long get_parent_ip(unsigned long addr); - extern void dump_cpu_task(int cpu); struct seq_file; |