[PATCH v1] percpu: use raw_local_irq_* in _this_cpu op

[PATCH v1] percpu: use raw_local_irq_* in _this_cpu op

[Ming Lei]

It doesn't make sense to trace irq off or do irq flags
lock proving inside 'this_cpu' operations, so replace local_irq_*
with raw_local_irq_* in 'this_cpu' op.

Also the patch fixes onelockdep warning[1] by the replacement, see
below:

In commit: 933393f58fef9963eac61db8093689544e29a600(percpu:
Remove irqsafe_cpu_xxx variants), local_irq_save/restore(flags) are
added inside this_cpu_inc operation, so that trace_hardirqs_off_caller
will be called by trace_hardirqs_on_caller directly because
__debug_atomic_inc is implemented as this_cpu_inc, which may trigger
the lockdep warning[1], for example in the below ARM scenary:

	kernel_thread_helper	/*irq disabled*/
		->trace_hardirqs_on_caller	/*hardirqs_enabled was set*/
			->trace_hardirqs_off_caller	/*hardirqs_enabled cleared*/
				__this_cpu_add(redundant_hardirqs_on)
			->trace_hardirqs_off_caller	/*irq disabled, so call here*/

The 'unannotated irqs-on' warning will be triggered somewhere because
irq is just enabled after the irq trace in kernel_thread_helper.

[1],
[    0.162841] ------------[ cut here ]------------
[    0.167694] WARNING: at kernel/lockdep.c:3493 check_flags+0xc0/0x1d0()
[    0.174468] Modules linked in:
[    0.177703] Backtrace:
[    0.180328] [<c00171f0>] (dump_backtrace+0x0/0x110) from [<c0412320>] (dump_stack+0x18/0x1c)
[    0.189086]  r6:c051f778 r5:00000da5 r4:00000000 r3:60000093
[    0.195007] [<c0412308>] (dump_stack+0x0/0x1c) from [<c00410e8>] (warn_slowpath_common+0x54/0x6c)
[    0.204223] [<c0041094>] (warn_slowpath_common+0x0/0x6c) from [<c0041124>] (warn_slowpath_null+0x24/0x2c)
[    0.214111]  r8:00000000 r7:00000000 r6:ee069598 r5:60000013 r4:ee082000
[    0.220825] r3:00000009
[    0.223693] [<c0041100>] (warn_slowpath_null+0x0/0x2c) from [<c0088f38>] (check_flags+0xc0/0x1d0)
[    0.232910] [<c0088e78>] (check_flags+0x0/0x1d0) from [<c008d348>] (lock_acquire+0x4c/0x11c)
[    0.241668] [<c008d2fc>] (lock_acquire+0x0/0x11c) from [<c0415aa4>] (_raw_spin_lock+0x3c/0x74)
[    0.250610] [<c0415a68>] (_raw_spin_lock+0x0/0x74) from [<c010a844>] (set_task_comm+0x20/0xc0)
[    0.259521]  r6:ee069588 r5:ee0691c0 r4:ee082000
[    0.264404] [<c010a824>] (set_task_comm+0x0/0xc0) from [<c0060780>] (kthreadd+0x28/0x108)
[    0.272857]  r8:00000000 r7:00000013 r6:c0044a08 r5:ee0691c0 r4:ee082000
[    0.279571] r3:ee083fe0
[    0.282470] [<c0060758>] (kthreadd+0x0/0x108) from [<c0044a08>] (do_exit+0x0/0x6dc)
[    0.290405]  r5:c0060758 r4:00000000
[    0.294189] ---[ end trace 1b75b31a2719ed1c ]---
[    0.299041] possible reason: unannotated irqs-on.
[    0.303955] irq event stamp: 5
[    0.307159] hardirqs last  enabled at (4): [<c001331c>] no_work_pending+0x8/0x2c
[    0.314880] hardirqs last disabled at (5): [<c0089b08>] trace_hardirqs_on_caller+0x60/0x26c
[    0.323547] softirqs last  enabled at (0): [<c003f754>] copy_process+0x33c/0xef4
[    0.331207] softirqs last disabled at (0): [<  (null)>]   (null)
[    0.337585] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
---
 include/linux/percpu.h |   20 ++++++++++----------
 1 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 6e68d05..5ed1e38 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -294,9 +294,9 @@ do {									\
 #define _this_cpu_generic_to_op(pcp, val, op)				\
 do {									\
 	unsigned long flags;						\
-	local_irq_save(flags);						\
+	raw_local_irq_save(flags);						\
 	*__this_cpu_ptr(&(pcp)) op val;					\
-	local_irq_restore(flags);					\
+	raw_local_irq_restore(flags);					\
 } while (0)
 
 #ifndef this_cpu_write
@@ -395,10 +395,10 @@ do {									\
 ({									\
 	typeof(pcp) ret__;						\
 	unsigned long flags;						\
-	local_irq_save(flags);						\
+	raw_local_irq_save(flags);						\
 	__this_cpu_add(pcp, val);					\
 	ret__ = __this_cpu_read(pcp);					\
-	local_irq_restore(flags);					\
+	raw_local_irq_restore(flags);					\
 	ret__;								\
 })
 
@@ -425,10 +425,10 @@ do {									\
 #define _this_cpu_generic_xchg(pcp, nval)				\
 ({	typeof(pcp) ret__;						\
 	unsigned long flags;						\
-	local_irq_save(flags);						\
+	raw_local_irq_save(flags);						\
 	ret__ = __this_cpu_read(pcp);					\
 	__this_cpu_write(pcp, nval);					\
-	local_irq_restore(flags);					\
+	raw_local_irq_restore(flags);					\
 	ret__;								\
 })
 
@@ -453,11 +453,11 @@ do {									\
 ({									\
 	typeof(pcp) ret__;						\
 	unsigned long flags;						\
-	local_irq_save(flags);						\
+	raw_local_irq_save(flags);						\
 	ret__ = __this_cpu_read(pcp);					\
 	if (ret__ == (oval))						\
 		__this_cpu_write(pcp, nval);				\
-	local_irq_restore(flags);					\
+	raw_local_irq_restore(flags);					\
 	ret__;								\
 })
 
@@ -490,10 +490,10 @@ do {									\
 ({									\
 	int ret__;							\
 	unsigned long flags;						\
-	local_irq_save(flags);						\
+	raw_local_irq_save(flags);						\
 	ret__ = __this_cpu_generic_cmpxchg_double(pcp1, pcp2,		\
 			oval1, oval2, nval1, nval2);			\
-	local_irq_restore(flags);					\
+	raw_local_irq_restore(flags);					\
 	ret__;								\
 })
 
-- 
1.7.9

Re: [PATCH v1] percpu: use raw_local_irq_* in _this_cpu op

[Eric Dumazet]

Le mercredi 15 février 2012 à 12:36 +0800, Ming Lei a écrit :
> It doesn't make sense to trace irq off or do irq flags
> lock proving inside 'this_cpu' operations, so replace local_irq_*
> with raw_local_irq_* in 'this_cpu' op.
...
> Acked-by: Christoph Lameter <cl@linux.com>
> Signed-off-by: Ming Lei <tom.leiming@gmail.com>
> ---
>  include/linux/percpu.h |   20 ++++++++++----------
>  1 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/include/linux/percpu.h b/include/linux/percpu.h
> index 6e68d05..5ed1e38 100644
> --- a/include/linux/percpu.h
> +++ b/include/linux/percpu.h
> @@ -294,9 +294,9 @@ do {									\
>  #define _this_cpu_generic_to_op(pcp, val, op)				\
>  do {									\
>  	unsigned long flags;						\
> -	local_irq_save(flags);						\
> +	raw_local_irq_save(flags);						\
>  	*__this_cpu_ptr(&(pcp)) op val;					\
> -	local_irq_restore(flags);					\
> +	raw_local_irq_restore(flags);					\
>  } while (0)
>  

Could you check the alignement of trailing '\' ?

Re: [PATCH v1] percpu: use raw_local_irq_* in _this_cpu op

[Ming Lei]

On Wed, Feb 15, 2012 at 12:59 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> Le mercredi 15 février 2012 à 12:36 +0800, Ming Lei a écrit :
>> It doesn't make sense to trace irq off or do irq flags
>> lock proving inside 'this_cpu' operations, so replace local_irq_*
>> with raw_local_irq_* in 'this_cpu' op.
> ...
>> Acked-by: Christoph Lameter <cl@linux.com>
>> Signed-off-by: Ming Lei <tom.leiming@gmail.com>
>> ---
>>  include/linux/percpu.h |   20 ++++++++++----------
>>  1 files changed, 10 insertions(+), 10 deletions(-)
>>
>> diff --git a/include/linux/percpu.h b/include/linux/percpu.h
>> index 6e68d05..5ed1e38 100644
>> --- a/include/linux/percpu.h
>> +++ b/include/linux/percpu.h
>> @@ -294,9 +294,9 @@ do {                                                                      \
>>  #define _this_cpu_generic_to_op(pcp, val, op)                                \
>>  do {                                                                 \
>>       unsigned long flags;                                            \
>> -     local_irq_save(flags);                                          \
>> +     raw_local_irq_save(flags);                                              \
>>       *__this_cpu_ptr(&(pcp)) op val;                                 \
>> -     local_irq_restore(flags);                                       \
>> +     raw_local_irq_restore(flags);                                   \
>>  } while (0)
>>
>
> Could you check the alignement of trailing '\' ?

Just several warnings, no errors. Also the 5 warnings are introduced
by previous commit, sounds nothing to do with motivation of this patch.
You may prepare a standalone patch to fix all the code style in this file, :-)

./script/checkpatch.pl
          WARNING: line over 80 characters
          ......
          total: 0 errors, 5 warnings, 60 lines checked


thanks,
-- 
Ming Lei

Re: [PATCH v1] percpu: use raw_local_irq_* in _this_cpu op

[Eric Dumazet]

Le mercredi 15 février 2012 à 13:08 +0800, Ming Lei a écrit :

> Just several warnings, no errors. Also the 5 warnings are introduced
> by previous commit, sounds nothing to do with motivation of this patch.
> You may prepare a standalone patch to fix all the code style in this file, :-)
> 

Oh well, I dont use checkpatch but spoke about trailing \

Cant you see them on your screen ?

We had :

#define _this_cpu_generic_to_op(pcp, val, op)				\
do {									\
	unsigned long flags;						\
	local_irq_save(flags);						\
	*__this_cpu_ptr(&(pcp)) op val;					\
	local_irq_restore(flags);					\
} while (0)


You want :

#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)


I suggest :

#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)


Is it clear now ?

[PATCH v1] percpu: use raw_local_irq_* in _this_cpu op

[Ming Lei]

It doesn't make sense to trace irq off or do irq flags
lock proving inside 'this_cpu' operations, so replace local_irq_*
with raw_local_irq_* in 'this_cpu' op.

Also the patch fixes onelockdep warning[1] by the replacement, see
below:

In commit: 933393f58fef9963eac61db8093689544e29a600(percpu:
Remove irqsafe_cpu_xxx variants), local_irq_save/restore(flags) are
added inside this_cpu_inc operation, so that trace_hardirqs_off_caller
will be called by trace_hardirqs_on_caller directly because
__debug_atomic_inc is implemented as this_cpu_inc, which may trigger
the lockdep warning[1], for example in the below ARM scenary:

	kernel_thread_helper	/*irq disabled*/
		->trace_hardirqs_on_caller	/*hardirqs_enabled was set*/
			->trace_hardirqs_off_caller	/*hardirqs_enabled cleared*/
				__this_cpu_add(redundant_hardirqs_on)
			->trace_hardirqs_off_caller	/*irq disabled, so call here*/

The 'unannotated irqs-on' warning will be triggered somewhere because
irq is just enabled after the irq trace in kernel_thread_helper.

[1],
[    0.162841] ------------[ cut here ]------------
[    0.167694] WARNING: at kernel/lockdep.c:3493 check_flags+0xc0/0x1d0()
[    0.174468] Modules linked in:
[    0.177703] Backtrace:
[    0.180328] [<c00171f0>] (dump_backtrace+0x0/0x110) from [<c0412320>] (dump_stack+0x18/0x1c)
[    0.189086]  r6:c051f778 r5:00000da5 r4:00000000 r3:60000093
[    0.195007] [<c0412308>] (dump_stack+0x0/0x1c) from [<c00410e8>] (warn_slowpath_common+0x54/0x6c)
[    0.204223] [<c0041094>] (warn_slowpath_common+0x0/0x6c) from [<c0041124>] (warn_slowpath_null+0x24/0x2c)
[    0.214111]  r8:00000000 r7:00000000 r6:ee069598 r5:60000013 r4:ee082000
[    0.220825] r3:00000009
[    0.223693] [<c0041100>] (warn_slowpath_null+0x0/0x2c) from [<c0088f38>] (check_flags+0xc0/0x1d0)
[    0.232910] [<c0088e78>] (check_flags+0x0/0x1d0) from [<c008d348>] (lock_acquire+0x4c/0x11c)
[    0.241668] [<c008d2fc>] (lock_acquire+0x0/0x11c) from [<c0415aa4>] (_raw_spin_lock+0x3c/0x74)
[    0.250610] [<c0415a68>] (_raw_spin_lock+0x0/0x74) from [<c010a844>] (set_task_comm+0x20/0xc0)
[    0.259521]  r6:ee069588 r5:ee0691c0 r4:ee082000
[    0.264404] [<c010a824>] (set_task_comm+0x0/0xc0) from [<c0060780>] (kthreadd+0x28/0x108)
[    0.272857]  r8:00000000 r7:00000013 r6:c0044a08 r5:ee0691c0 r4:ee082000
[    0.279571] r3:ee083fe0
[    0.282470] [<c0060758>] (kthreadd+0x0/0x108) from [<c0044a08>] (do_exit+0x0/0x6dc)
[    0.290405]  r5:c0060758 r4:00000000
[    0.294189] ---[ end trace 1b75b31a2719ed1c ]---
[    0.299041] possible reason: unannotated irqs-on.
[    0.303955] irq event stamp: 5
[    0.307159] hardirqs last  enabled at (4): [<c001331c>] no_work_pending+0x8/0x2c
[    0.314880] hardirqs last disabled at (5): [<c0089b08>] trace_hardirqs_on_caller+0x60/0x26c
[    0.323547] softirqs last  enabled at (0): [<c003f754>] copy_process+0x33c/0xef4
[    0.331207] softirqs last disabled at (0): [<  (null)>]   (null)
[    0.337585] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
---
 include/linux/percpu.h |   20 ++++++++++----------
 1 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 32cd1f6..67c8b69 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -348,9 +348,9 @@ do {									\
 #define _this_cpu_generic_to_op(pcp, val, op)				\
 do {									\
 	unsigned long flags;						\
-	local_irq_save(flags);						\
+	raw_local_irq_save(flags);					\
 	*__this_cpu_ptr(&(pcp)) op val;					\
-	local_irq_restore(flags);					\
+	raw_local_irq_restore(flags);					\
 } while (0)
 
 #ifndef this_cpu_write
@@ -449,10 +449,10 @@ do {									\
 ({									\
 	typeof(pcp) ret__;						\
 	unsigned long flags;						\
-	local_irq_save(flags);						\
+	raw_local_irq_save(flags);					\
 	__this_cpu_add(pcp, val);					\
 	ret__ = __this_cpu_read(pcp);					\
-	local_irq_restore(flags);					\
+	raw_local_irq_restore(flags);					\
 	ret__;								\
 })
 
@@ -479,10 +479,10 @@ do {									\
 #define _this_cpu_generic_xchg(pcp, nval)				\
 ({	typeof(pcp) ret__;						\
 	unsigned long flags;						\
-	local_irq_save(flags);						\
+	raw_local_irq_save(flags);					\
 	ret__ = __this_cpu_read(pcp);					\
 	__this_cpu_write(pcp, nval);					\
-	local_irq_restore(flags);					\
+	raw_local_irq_restore(flags);					\
 	ret__;								\
 })
 
@@ -507,11 +507,11 @@ do {									\
 ({									\
 	typeof(pcp) ret__;						\
 	unsigned long flags;						\
-	local_irq_save(flags);						\
+	raw_local_irq_save(flags);					\
 	ret__ = __this_cpu_read(pcp);					\
 	if (ret__ == (oval))						\
 		__this_cpu_write(pcp, nval);				\
-	local_irq_restore(flags);					\
+	raw_local_irq_restore(flags);					\
 	ret__;								\
 })
 
@@ -544,10 +544,10 @@ do {									\
 ({									\
 	int ret__;							\
 	unsigned long flags;						\
-	local_irq_save(flags);						\
+	raw_local_irq_save(flags);					\
 	ret__ = __this_cpu_generic_cmpxchg_double(pcp1, pcp2,		\
 			oval1, oval2, nval1, nval2);			\
-	local_irq_restore(flags);					\
+	raw_local_irq_restore(flags);					\
 	ret__;								\
 })
 
-- 
1.7.9

Re: [PATCH v1] percpu: use raw_local_irq_* in _this_cpu op

[Ming Lei]

On Wed, Feb 15, 2012 at 2:03 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> Le mercredi 15 février 2012 à 13:08 +0800, Ming Lei a écrit :
>
>> Just several warnings, no errors. Also the 5 warnings are introduced
>> by previous commit, sounds nothing to do with motivation of this patch.
>> You may prepare a standalone patch to fix all the code style in this file, :-)
>>
>
> Oh well, I dont use checkpatch but spoke about trailing \
>
> Cant you see them on your screen ?
>
> We had :
>
> #define _this_cpu_generic_to_op(pcp, val, op)                           \
> do {                                                                    \
>        unsigned long flags;                                            \
>        local_irq_save(flags);                                          \
>        *__this_cpu_ptr(&(pcp)) op val;                                 \
>        local_irq_restore(flags);                                       \
> } while (0)
>
>
> You want :
>
> #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)
>
>
> I suggest :
>
> #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)
>
>
> Is it clear now ?

Thanks for your pointing it out.
Yes, I have updated the patch and sent it out.


thanks,
-- 
Ming Lei
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Re: [PATCH v1] percpu: use raw_local_irq_* in _this_cpu op

[Tejun Heo]

On Wed, Feb 15, 2012 at 04:54:38PM +0800, Ming Lei wrote:
> It doesn't make sense to trace irq off or do irq flags
> lock proving inside 'this_cpu' operations, so replace local_irq_*
> with raw_local_irq_* in 'this_cpu' op.
> 
> Also the patch fixes onelockdep warning[1] by the replacement, see
> below:
> 
> In commit: 933393f58fef9963eac61db8093689544e29a600(percpu:
> Remove irqsafe_cpu_xxx variants), local_irq_save/restore(flags) are
> added inside this_cpu_inc operation, so that trace_hardirqs_off_caller
> will be called by trace_hardirqs_on_caller directly because
> __debug_atomic_inc is implemented as this_cpu_inc, which may trigger
> the lockdep warning[1], for example in the below ARM scenary:
> 
> 	kernel_thread_helper	/*irq disabled*/
> 		->trace_hardirqs_on_caller	/*hardirqs_enabled was set*/
> 			->trace_hardirqs_off_caller	/*hardirqs_enabled cleared*/
> 				__this_cpu_add(redundant_hardirqs_on)
> 			->trace_hardirqs_off_caller	/*irq disabled, so call here*/
> 
> The 'unannotated irqs-on' warning will be triggered somewhere because
> irq is just enabled after the irq trace in kernel_thread_helper.
> 
> [1],
> [    0.162841] ------------[ cut here ]------------
> [    0.167694] WARNING: at kernel/lockdep.c:3493 check_flags+0xc0/0x1d0()
> [    0.174468] Modules linked in:
> [    0.177703] Backtrace:
> [    0.180328] [<c00171f0>] (dump_backtrace+0x0/0x110) from [<c0412320>] (dump_stack+0x18/0x1c)
> [    0.189086]  r6:c051f778 r5:00000da5 r4:00000000 r3:60000093
> [    0.195007] [<c0412308>] (dump_stack+0x0/0x1c) from [<c00410e8>] (warn_slowpath_common+0x54/0x6c)
> [    0.204223] [<c0041094>] (warn_slowpath_common+0x0/0x6c) from [<c0041124>] (warn_slowpath_null+0x24/0x2c)
> [    0.214111]  r8:00000000 r7:00000000 r6:ee069598 r5:60000013 r4:ee082000
> [    0.220825] r3:00000009
> [    0.223693] [<c0041100>] (warn_slowpath_null+0x0/0x2c) from [<c0088f38>] (check_flags+0xc0/0x1d0)
> [    0.232910] [<c0088e78>] (check_flags+0x0/0x1d0) from [<c008d348>] (lock_acquire+0x4c/0x11c)
> [    0.241668] [<c008d2fc>] (lock_acquire+0x0/0x11c) from [<c0415aa4>] (_raw_spin_lock+0x3c/0x74)
> [    0.250610] [<c0415a68>] (_raw_spin_lock+0x0/0x74) from [<c010a844>] (set_task_comm+0x20/0xc0)
> [    0.259521]  r6:ee069588 r5:ee0691c0 r4:ee082000
> [    0.264404] [<c010a824>] (set_task_comm+0x0/0xc0) from [<c0060780>] (kthreadd+0x28/0x108)
> [    0.272857]  r8:00000000 r7:00000013 r6:c0044a08 r5:ee0691c0 r4:ee082000
> [    0.279571] r3:ee083fe0
> [    0.282470] [<c0060758>] (kthreadd+0x0/0x108) from [<c0044a08>] (do_exit+0x0/0x6dc)
> [    0.290405]  r5:c0060758 r4:00000000
> [    0.294189] ---[ end trace 1b75b31a2719ed1c ]---
> [    0.299041] possible reason: unannotated irqs-on.
> [    0.303955] irq event stamp: 5
> [    0.307159] hardirqs last  enabled at (4): [<c001331c>] no_work_pending+0x8/0x2c
> [    0.314880] hardirqs last disabled at (5): [<c0089b08>] trace_hardirqs_on_caller+0x60/0x26c
> [    0.323547] softirqs last  enabled at (0): [<c003f754>] copy_process+0x33c/0xef4
> [    0.331207] softirqs last disabled at (0): [<  (null)>]   (null)
> [    0.337585] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
> 
> Acked-by: Christoph Lameter <cl@linux.com>
> Signed-off-by: Ming Lei <tom.leiming@gmail.com>

Applied to for-3.3-fixes.  Thank you.

-- 
tejun