ring-buffer: Replace this_cpu_*() with __this_cpu_*()
authorSteven Rostedt <rostedt@goodmis.org>
Tue, 17 Mar 2015 14:40:38 +0000 (10:40 -0400)
committerSteven Rostedt <rostedt@goodmis.org>
Wed, 25 Mar 2015 12:56:49 +0000 (08:56 -0400)
It has come to my attention that this_cpu_read/write are horrible on
architectures other than x86. Worse yet, they actually disable
preemption or interrupts! This caused some unexpected tracing results
on ARM.

   101.356868: preempt_count_add <-ring_buffer_lock_reserve
   101.356870: preempt_count_sub <-ring_buffer_lock_reserve

The ring_buffer_lock_reserve has recursion protection that requires
accessing a per cpu variable. But since preempt_disable() is traced, it
too got traced while accessing the variable that is suppose to prevent
recursion like this.

The generic version of this_cpu_read() and write() are:

 #define this_cpu_generic_read(pcp) \
 ({ typeof(pcp) ret__; \
preempt_disable(); \
ret__ = *this_cpu_ptr(&(pcp)); \
preempt_enable(); \
ret__; \
 })

 #define this_cpu_generic_to_op(pcp, val, op) \
 do { \
unsigned long flags; \
raw_local_irq_save(flags); \
*__this_cpu_ptr(&(pcp)) op val; \
raw_local_irq_restore(flags); \
 } while (0)

Which is unacceptable for locations that know they are within preempt
disabled or interrupt disabled locations.

Paul McKenney stated that __this_cpu_() versions produce much better code on
other architectures than this_cpu_() does, if we know that the call is done in
a preempt disabled location.

I also changed the recursive_unlock() to use two local variables instead
of accessing the per_cpu variable twice.

Link: http://lkml.kernel.org/r/20150317114411.GE3589@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/20150317104038.312e73d1@gandalf.local.home
Cc: stable@vger.kernel.org
Acked-by: Christoph Lameter <cl@linux.com>
Reported-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
Tested-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
kernel/trace/ring_buffer.c

index 5040d44..922048a 100644 (file)
@@ -2679,7 +2679,7 @@ static DEFINE_PER_CPU(unsigned int, current_context);
 
 static __always_inline int trace_recursive_lock(void)
 {
-       unsigned int val = this_cpu_read(current_context);
+       unsigned int val = __this_cpu_read(current_context);
        int bit;
 
        if (in_interrupt()) {
@@ -2696,18 +2696,17 @@ static __always_inline int trace_recursive_lock(void)
                return 1;
 
        val |= (1 << bit);
-       this_cpu_write(current_context, val);
+       __this_cpu_write(current_context, val);
 
        return 0;
 }
 
 static __always_inline void trace_recursive_unlock(void)
 {
-       unsigned int val = this_cpu_read(current_context);
+       unsigned int val = __this_cpu_read(current_context);
 
-       val--;
-       val &= this_cpu_read(current_context);
-       this_cpu_write(current_context, val);
+       val &= val & (val - 1);
+       __this_cpu_write(current_context, val);
 }
 
 #else