* [RFC PATCH v1 1/9] timer: fix circular header dependency
[not found] <cover.1537802981.git.christophe.leroy@c-s.fr>
@ 2018-09-24 15:52 ` Christophe Leroy
2018-09-25 5:34 ` Christophe LEROY
0 siblings, 1 reply; 6+ messages in thread
From: Christophe Leroy @ 2018-09-24 15:52 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
aneesh.kumar, npiggin, Thomas Gleixner, Alexander Viro,
John Stultz, Stephen Boyd
Cc: linux-kernel, linuxppc-dev, linux-fsdevel
When switching powerpc to CONFIG_THREAD_INFO_IN_TASK, include/sched.h
has to be included in asm/smp.h for the following change, in order
to avoid uncomplete definition of task_struct:
-#define raw_smp_processor_id() (current_thread_info()->cpu)
+#define raw_smp_processor_id() (current->cpu)
But this generates the following compilation error, due to circular
header dependency.
CC kernel/time/alarmtimer.o
In file included from ./arch/powerpc/include/asm/smp.h:31,
from ./include/linux/smp.h:64,
from ./include/linux/percpu.h:7,
from ./include/linux/hrtimer.h:22,
from kernel/time/alarmtimer.c:19:
./include/linux/sched.h:558:19: error: field 'dl_timer' has incomplete type
struct hrtimer dl_timer;
^~~~~~~~
./include/linux/sched.h:567:17: error: field 'inactive_timer' has incomplete type
struct hrtimer inactive_timer;
^~~~~~~~~~~~~~
make[1]: *** [kernel/time/alarmtimer.o] Error 1
make: *** [kernel/time/alarmtimer.o] Error 2
CC fs/timerfd.o
In file included from ./arch/powerpc/include/asm/smp.h:31,
from ./include/linux/smp.h:64,
from ./include/linux/percpu.h:7,
from ./include/linux/hrtimer.h:22,
from ./include/linux/alarmtimer.h:6,
from fs/timerfd.c:12:
./include/linux/sched.h:558:19: error: field 'dl_timer' has incomplete type
struct hrtimer dl_timer;
^~~~~~~~
./include/linux/sched.h:567:17: error: field 'inactive_timer' has incomplete type
struct hrtimer inactive_timer;
^~~~~~~~~~~~~~
make[1]: *** [fs/timerfd.o] Error 1
make: *** [fs/timerfd.o] Error 2
This patch fixes it by including linux/hrtimer.h after linux/sched.h
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
Should it be fixed in powerpc instead ? In that case, how ? Any idea ?
fs/timerfd.c | 2 +-
kernel/time/alarmtimer.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/timerfd.c b/fs/timerfd.c
index d69ad801eb80..0fc01b241382 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -9,12 +9,12 @@
*
*/
-#include <linux/alarmtimer.h>
#include <linux/file.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/sched.h>
+#include <linux/alarmtimer.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/list.h>
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index fa5de5e8de61..5fb75c9b3f06 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -16,11 +16,11 @@
* published by the Free Software Foundation.
*/
#include <linux/time.h>
-#include <linux/hrtimer.h>
#include <linux/timerqueue.h>
#include <linux/rtc.h>
#include <linux/sched/signal.h>
#include <linux/sched/debug.h>
+#include <linux/hrtimer.h>
#include <linux/alarmtimer.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
--
2.13.3
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [RFC PATCH v1 1/9] timer: fix circular header dependency
2018-09-24 15:52 ` [RFC PATCH v1 1/9] timer: fix circular header dependency Christophe Leroy
@ 2018-09-25 5:34 ` Christophe LEROY
2018-09-25 6:33 ` Christophe LEROY
2018-09-25 12:11 ` Mark Rutland
0 siblings, 2 replies; 6+ messages in thread
From: Christophe LEROY @ 2018-09-25 5:34 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
aneesh.kumar, npiggin, Thomas Gleixner, Alexander Viro,
John Stultz, Stephen Boyd
Cc: linux-fsdevel, linuxppc-dev, linux-kernel
Le 24/09/2018 à 17:52, Christophe Leroy a écrit :
> When switching powerpc to CONFIG_THREAD_INFO_IN_TASK, include/sched.h
> has to be included in asm/smp.h for the following change, in order
> to avoid uncomplete definition of task_struct:
>
> -#define raw_smp_processor_id() (current_thread_info()->cpu)
> +#define raw_smp_processor_id() (current->cpu)
>
> But this generates the following compilation error, due to circular
> header dependency.
>
> CC kernel/time/alarmtimer.o
> In file included from ./arch/powerpc/include/asm/smp.h:31,
> from ./include/linux/smp.h:64,
> from ./include/linux/percpu.h:7,
> from ./include/linux/hrtimer.h:22,
> from kernel/time/alarmtimer.c:19:
> ./include/linux/sched.h:558:19: error: field 'dl_timer' has incomplete type
> struct hrtimer dl_timer;
> ^~~~~~~~
> ./include/linux/sched.h:567:17: error: field 'inactive_timer' has incomplete type
> struct hrtimer inactive_timer;
> ^~~~~~~~~~~~~~
> make[1]: *** [kernel/time/alarmtimer.o] Error 1
> make: *** [kernel/time/alarmtimer.o] Error 2
>
> CC fs/timerfd.o
> In file included from ./arch/powerpc/include/asm/smp.h:31,
> from ./include/linux/smp.h:64,
> from ./include/linux/percpu.h:7,
> from ./include/linux/hrtimer.h:22,
> from ./include/linux/alarmtimer.h:6,
> from fs/timerfd.c:12:
> ./include/linux/sched.h:558:19: error: field 'dl_timer' has incomplete type
> struct hrtimer dl_timer;
> ^~~~~~~~
> ./include/linux/sched.h:567:17: error: field 'inactive_timer' has incomplete type
> struct hrtimer inactive_timer;
> ^~~~~~~~~~~~~~
> make[1]: *** [fs/timerfd.o] Error 1
> make: *** [fs/timerfd.o] Error 2
>
> This patch fixes it by including linux/hrtimer.h after linux/sched.h
>
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
> ---
> Should it be fixed in powerpc instead ? In that case, how ? Any idea ?
Looks like there are several other places where the problem occurs, so
it has to be fixed in the powerpc headers instead.
Seems like RISC arch faced the same issue, and fixed it the following way:
/*
* This is particularly ugly: it appears we can't actually get the
definition
* of task_struct here, but we need access to the CPU this task is
running on.
* Instead of using C we're using asm-offsets.h to get the current
processor
* ID.
*/
#define raw_smp_processor_id() (*((int*)((char*)get_current() +
TASK_TI_CPU)))
Unless someone has a better idea, I'll fixed it that way.
Christophe
>
> fs/timerfd.c | 2 +-
> kernel/time/alarmtimer.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/timerfd.c b/fs/timerfd.c
> index d69ad801eb80..0fc01b241382 100644
> --- a/fs/timerfd.c
> +++ b/fs/timerfd.c
> @@ -9,12 +9,12 @@
> *
> */
>
> -#include <linux/alarmtimer.h>
> #include <linux/file.h>
> #include <linux/poll.h>
> #include <linux/init.h>
> #include <linux/fs.h>
> #include <linux/sched.h>
> +#include <linux/alarmtimer.h>
> #include <linux/kernel.h>
> #include <linux/slab.h>
> #include <linux/list.h>
> diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
> index fa5de5e8de61..5fb75c9b3f06 100644
> --- a/kernel/time/alarmtimer.c
> +++ b/kernel/time/alarmtimer.c
> @@ -16,11 +16,11 @@
> * published by the Free Software Foundation.
> */
> #include <linux/time.h>
> -#include <linux/hrtimer.h>
> #include <linux/timerqueue.h>
> #include <linux/rtc.h>
> #include <linux/sched/signal.h>
> #include <linux/sched/debug.h>
> +#include <linux/hrtimer.h>
> #include <linux/alarmtimer.h>
> #include <linux/mutex.h>
> #include <linux/platform_device.h>
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [RFC PATCH v1 1/9] timer: fix circular header dependency
2018-09-25 5:34 ` Christophe LEROY
@ 2018-09-25 6:33 ` Christophe LEROY
2018-09-25 12:11 ` Mark Rutland
1 sibling, 0 replies; 6+ messages in thread
From: Christophe LEROY @ 2018-09-25 6:33 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
aneesh.kumar, npiggin, Thomas Gleixner, Alexander Viro,
John Stultz, Stephen Boyd
Cc: linux-fsdevel, linuxppc-dev, linux-kernel
Le 25/09/2018 à 07:34, Christophe LEROY a écrit :
>
>
> Le 24/09/2018 à 17:52, Christophe Leroy a écrit :
>> When switching powerpc to CONFIG_THREAD_INFO_IN_TASK, include/sched.h
>> has to be included in asm/smp.h for the following change, in order
>> to avoid uncomplete definition of task_struct:
>>
>> -#define raw_smp_processor_id() (current_thread_info()->cpu)
>> +#define raw_smp_processor_id() (current->cpu)
>>
>> But this generates the following compilation error, due to circular
>> header dependency.
>>
>> CC kernel/time/alarmtimer.o
>> In file included from ./arch/powerpc/include/asm/smp.h:31,
>> from ./include/linux/smp.h:64,
>> from ./include/linux/percpu.h:7,
>> from ./include/linux/hrtimer.h:22,
>> from kernel/time/alarmtimer.c:19:
>> ./include/linux/sched.h:558:19: error: field 'dl_timer' has incomplete
>> type
>> struct hrtimer dl_timer;
>> ^~~~~~~~
>> ./include/linux/sched.h:567:17: error: field 'inactive_timer' has
>> incomplete type
>> struct hrtimer inactive_timer;
>> ^~~~~~~~~~~~~~
>> make[1]: *** [kernel/time/alarmtimer.o] Error 1
>> make: *** [kernel/time/alarmtimer.o] Error 2
>>
>> CC fs/timerfd.o
>> In file included from ./arch/powerpc/include/asm/smp.h:31,
>> from ./include/linux/smp.h:64,
>> from ./include/linux/percpu.h:7,
>> from ./include/linux/hrtimer.h:22,
>> from ./include/linux/alarmtimer.h:6,
>> from fs/timerfd.c:12:
>> ./include/linux/sched.h:558:19: error: field 'dl_timer' has incomplete
>> type
>> struct hrtimer dl_timer;
>> ^~~~~~~~
>> ./include/linux/sched.h:567:17: error: field 'inactive_timer' has
>> incomplete type
>> struct hrtimer inactive_timer;
>> ^~~~~~~~~~~~~~
>> make[1]: *** [fs/timerfd.o] Error 1
>> make: *** [fs/timerfd.o] Error 2
>>
>> This patch fixes it by including linux/hrtimer.h after linux/sched.h
>>
>> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
>> ---
>> Should it be fixed in powerpc instead ? In that case, how ? Any idea ?
>
>
> Looks like there are several other places where the problem occurs, so
> it has to be fixed in the powerpc headers instead.
>
> Seems like RISC arch faced the same issue, and fixed it the following way:
>
> /*
> * This is particularly ugly: it appears we can't actually get the
> definition
> * of task_struct here, but we need access to the CPU this task is
> running on.
> * Instead of using C we're using asm-offsets.h to get the current
> processor
> * ID.
> */
> #define raw_smp_processor_id() (*((int*)((char*)get_current() +
> TASK_TI_CPU)))
>
>
> Unless someone has a better idea, I'll fixed it that way.
Not easy. I'm stuck at the moment, because asm-offsets.h redefines a lot
of things with the same name as in C, so when including asm-offsets.h in
C it conflicts. Argh !. Need to fix all those duplicates ?
Christophe
>
> Christophe
>
>
>>
>> fs/timerfd.c | 2 +-
>> kernel/time/alarmtimer.c | 2 +-
>> 2 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/timerfd.c b/fs/timerfd.c
>> index d69ad801eb80..0fc01b241382 100644
>> --- a/fs/timerfd.c
>> +++ b/fs/timerfd.c
>> @@ -9,12 +9,12 @@
>> *
>> */
>> -#include <linux/alarmtimer.h>
>> #include <linux/file.h>
>> #include <linux/poll.h>
>> #include <linux/init.h>
>> #include <linux/fs.h>
>> #include <linux/sched.h>
>> +#include <linux/alarmtimer.h>
>> #include <linux/kernel.h>
>> #include <linux/slab.h>
>> #include <linux/list.h>
>> diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
>> index fa5de5e8de61..5fb75c9b3f06 100644
>> --- a/kernel/time/alarmtimer.c
>> +++ b/kernel/time/alarmtimer.c
>> @@ -16,11 +16,11 @@
>> * published by the Free Software Foundation.
>> */
>> #include <linux/time.h>
>> -#include <linux/hrtimer.h>
>> #include <linux/timerqueue.h>
>> #include <linux/rtc.h>
>> #include <linux/sched/signal.h>
>> #include <linux/sched/debug.h>
>> +#include <linux/hrtimer.h>
>> #include <linux/alarmtimer.h>
>> #include <linux/mutex.h>
>> #include <linux/platform_device.h>
>>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [RFC PATCH v1 1/9] timer: fix circular header dependency
2018-09-25 5:34 ` Christophe LEROY
2018-09-25 6:33 ` Christophe LEROY
@ 2018-09-25 12:11 ` Mark Rutland
2018-09-25 12:15 ` Christophe LEROY
1 sibling, 1 reply; 6+ messages in thread
From: Mark Rutland @ 2018-09-25 12:11 UTC (permalink / raw)
To: Christophe LEROY
Cc: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
aneesh.kumar, npiggin, Thomas Gleixner, Alexander Viro,
John Stultz, Stephen Boyd, linux-fsdevel, linuxppc-dev,
linux-kernel
On Tue, Sep 25, 2018 at 07:34:15AM +0200, Christophe LEROY wrote:
>
>
> Le 24/09/2018 à 17:52, Christophe Leroy a écrit :
> > When switching powerpc to CONFIG_THREAD_INFO_IN_TASK, include/sched.h
> > has to be included in asm/smp.h for the following change, in order
> > to avoid uncomplete definition of task_struct:
> >
> > -#define raw_smp_processor_id() (current_thread_info()->cpu)
> > +#define raw_smp_processor_id() (current->cpu)
> >
> > But this generates the following compilation error, due to circular
> > header dependency.
> >
> > CC kernel/time/alarmtimer.o
> > In file included from ./arch/powerpc/include/asm/smp.h:31,
> > from ./include/linux/smp.h:64,
> > from ./include/linux/percpu.h:7,
> > from ./include/linux/hrtimer.h:22,
> > from kernel/time/alarmtimer.c:19:
> > ./include/linux/sched.h:558:19: error: field 'dl_timer' has incomplete type
> > struct hrtimer dl_timer;
> > ^~~~~~~~
> > ./include/linux/sched.h:567:17: error: field 'inactive_timer' has incomplete type
> > struct hrtimer inactive_timer;
> > ^~~~~~~~~~~~~~
> > make[1]: *** [kernel/time/alarmtimer.o] Error 1
> > make: *** [kernel/time/alarmtimer.o] Error 2
> >
> > CC fs/timerfd.o
> > In file included from ./arch/powerpc/include/asm/smp.h:31,
> > from ./include/linux/smp.h:64,
> > from ./include/linux/percpu.h:7,
> > from ./include/linux/hrtimer.h:22,
> > from ./include/linux/alarmtimer.h:6,
> > from fs/timerfd.c:12:
> > ./include/linux/sched.h:558:19: error: field 'dl_timer' has incomplete type
> > struct hrtimer dl_timer;
> > ^~~~~~~~
> > ./include/linux/sched.h:567:17: error: field 'inactive_timer' has incomplete type
> > struct hrtimer inactive_timer;
> > ^~~~~~~~~~~~~~
> > make[1]: *** [fs/timerfd.o] Error 1
> > make: *** [fs/timerfd.o] Error 2
> >
> > This patch fixes it by including linux/hrtimer.h after linux/sched.h
> >
> > Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
> > ---
> > Should it be fixed in powerpc instead ? In that case, how ? Any idea ?
>
>
> Looks like there are several other places where the problem occurs, so it
> has to be fixed in the powerpc headers instead.
>
> Seems like RISC arch faced the same issue, and fixed it the following way:
>
> /*
> * This is particularly ugly: it appears we can't actually get the
> definition
> * of task_struct here, but we need access to the CPU this task is running
> on.
> * Instead of using C we're using asm-offsets.h to get the current processor
> * ID.
> */
> #define raw_smp_processor_id() (*((int*)((char*)get_current() +
> TASK_TI_CPU)))
>
>
> Unless someone has a better idea, I'll fixed it that way.
To solve this on arm64 we made the cpu number a percpu variable; see
commit:
57c82954e77fa12c ("arm64: make cpu number a percpu variable")
IIUC, you could do that by placing it in paca_struct.
Thanks,
Mark.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [RFC PATCH v1 1/9] timer: fix circular header dependency
2018-09-25 12:11 ` Mark Rutland
@ 2018-09-25 12:15 ` Christophe LEROY
2018-09-25 17:48 ` Christophe Leroy
0 siblings, 1 reply; 6+ messages in thread
From: Christophe LEROY @ 2018-09-25 12:15 UTC (permalink / raw)
To: Mark Rutland
Cc: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
aneesh.kumar, npiggin, Thomas Gleixner, Alexander Viro,
John Stultz, Stephen Boyd, linux-fsdevel, linuxppc-dev,
linux-kernel
Le 25/09/2018 à 14:11, Mark Rutland a écrit :
> On Tue, Sep 25, 2018 at 07:34:15AM +0200, Christophe LEROY wrote:
>>
>>
>> Le 24/09/2018 à 17:52, Christophe Leroy a écrit :
>>> When switching powerpc to CONFIG_THREAD_INFO_IN_TASK, include/sched.h
>>> has to be included in asm/smp.h for the following change, in order
>>> to avoid uncomplete definition of task_struct:
>>>
>>> -#define raw_smp_processor_id() (current_thread_info()->cpu)
>>> +#define raw_smp_processor_id() (current->cpu)
>>>
>>> But this generates the following compilation error, due to circular
>>> header dependency.
>>>
>>> CC kernel/time/alarmtimer.o
>>> In file included from ./arch/powerpc/include/asm/smp.h:31,
>>> from ./include/linux/smp.h:64,
>>> from ./include/linux/percpu.h:7,
>>> from ./include/linux/hrtimer.h:22,
>>> from kernel/time/alarmtimer.c:19:
>>> ./include/linux/sched.h:558:19: error: field 'dl_timer' has incomplete type
>>> struct hrtimer dl_timer;
>>> ^~~~~~~~
>>> ./include/linux/sched.h:567:17: error: field 'inactive_timer' has incomplete type
>>> struct hrtimer inactive_timer;
>>> ^~~~~~~~~~~~~~
>>> make[1]: *** [kernel/time/alarmtimer.o] Error 1
>>> make: *** [kernel/time/alarmtimer.o] Error 2
>>>
>>> CC fs/timerfd.o
>>> In file included from ./arch/powerpc/include/asm/smp.h:31,
>>> from ./include/linux/smp.h:64,
>>> from ./include/linux/percpu.h:7,
>>> from ./include/linux/hrtimer.h:22,
>>> from ./include/linux/alarmtimer.h:6,
>>> from fs/timerfd.c:12:
>>> ./include/linux/sched.h:558:19: error: field 'dl_timer' has incomplete type
>>> struct hrtimer dl_timer;
>>> ^~~~~~~~
>>> ./include/linux/sched.h:567:17: error: field 'inactive_timer' has incomplete type
>>> struct hrtimer inactive_timer;
>>> ^~~~~~~~~~~~~~
>>> make[1]: *** [fs/timerfd.o] Error 1
>>> make: *** [fs/timerfd.o] Error 2
>>>
>>> This patch fixes it by including linux/hrtimer.h after linux/sched.h
>>>
>>> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
>>> ---
>>> Should it be fixed in powerpc instead ? In that case, how ? Any idea ?
>>
>>
>> Looks like there are several other places where the problem occurs, so it
>> has to be fixed in the powerpc headers instead.
>>
>> Seems like RISC arch faced the same issue, and fixed it the following way:
>>
>> /*
>> * This is particularly ugly: it appears we can't actually get the
>> definition
>> * of task_struct here, but we need access to the CPU this task is running
>> on.
>> * Instead of using C we're using asm-offsets.h to get the current processor
>> * ID.
>> */
>> #define raw_smp_processor_id() (*((int*)((char*)get_current() +
>> TASK_TI_CPU)))
>>
>>
>> Unless someone has a better idea, I'll fixed it that way.
>
> To solve this on arm64 we made the cpu number a percpu variable; see
> commit:
>
> 57c82954e77fa12c ("arm64: make cpu number a percpu variable")
Thanks, I'll have a look
> IIUC, you could do that by placing it in paca_struct.
By the way, it is already in PACA struct for PPC64.
The issue is with PPC32, up to now it was in current_thread_info:
#ifdef CONFIG_PPC64
#define raw_smp_processor_id() (local_paca->paca_index)
#define hard_smp_processor_id() (get_paca()->hw_cpu_id)
#else
/* 32-bit */
extern int smp_hw_index[];
#define raw_smp_processor_id() (current_thread_info()->cpu)
#define hard_smp_processor_id() (smp_hw_index[smp_processor_id()])
[..]
#endif
Christophe
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [RFC PATCH v1 1/9] timer: fix circular header dependency
2018-09-25 12:15 ` Christophe LEROY
@ 2018-09-25 17:48 ` Christophe Leroy
0 siblings, 0 replies; 6+ messages in thread
From: Christophe Leroy @ 2018-09-25 17:48 UTC (permalink / raw)
To: Mark Rutland
Cc: Stephen Boyd, linux-kernel, npiggin, Paul Mackerras,
aneesh.kumar, linux-fsdevel, John Stultz, Thomas Gleixner,
linuxppc-dev, Alexander Viro
On 09/25/2018 12:15 PM, Christophe LEROY wrote:
>
>
> Le 25/09/2018 à 14:11, Mark Rutland a écrit :
>> On Tue, Sep 25, 2018 at 07:34:15AM +0200, Christophe LEROY wrote:
>>>
>>>
>>> Le 24/09/2018 à 17:52, Christophe Leroy a écrit :
>>>> When switching powerpc to CONFIG_THREAD_INFO_IN_TASK, include/sched.h
>>>> has to be included in asm/smp.h for the following change, in order
>>>> to avoid uncomplete definition of task_struct:
>>>>
>>>> -#define raw_smp_processor_id() (current_thread_info()->cpu)
>>>> +#define raw_smp_processor_id() (current->cpu)
>>>>
>>>> But this generates the following compilation error, due to circular
>>>> header dependency.
>>>>
>>>> CC kernel/time/alarmtimer.o
>>>> In file included from ./arch/powerpc/include/asm/smp.h:31,
>>>> from ./include/linux/smp.h:64,
>>>> from ./include/linux/percpu.h:7,
>>>> from ./include/linux/hrtimer.h:22,
>>>> from kernel/time/alarmtimer.c:19:
>>>> ./include/linux/sched.h:558:19: error: field 'dl_timer' has
>>>> incomplete type
>>>> struct hrtimer dl_timer;
>>>> ^~~~~~~~
>>>> ./include/linux/sched.h:567:17: error: field 'inactive_timer' has
>>>> incomplete type
>>>> struct hrtimer inactive_timer;
>>>> ^~~~~~~~~~~~~~
>>>> make[1]: *** [kernel/time/alarmtimer.o] Error 1
>>>> make: *** [kernel/time/alarmtimer.o] Error 2
>>>>
>>>> CC fs/timerfd.o
>>>> In file included from ./arch/powerpc/include/asm/smp.h:31,
>>>> from ./include/linux/smp.h:64,
>>>> from ./include/linux/percpu.h:7,
>>>> from ./include/linux/hrtimer.h:22,
>>>> from ./include/linux/alarmtimer.h:6,
>>>> from fs/timerfd.c:12:
>>>> ./include/linux/sched.h:558:19: error: field 'dl_timer' has
>>>> incomplete type
>>>> struct hrtimer dl_timer;
>>>> ^~~~~~~~
>>>> ./include/linux/sched.h:567:17: error: field 'inactive_timer' has
>>>> incomplete type
>>>> struct hrtimer inactive_timer;
>>>> ^~~~~~~~~~~~~~
>>>> make[1]: *** [fs/timerfd.o] Error 1
>>>> make: *** [fs/timerfd.o] Error 2
>>>>
>>>> This patch fixes it by including linux/hrtimer.h after linux/sched.h
>>>>
>>>> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
>>>> ---
>>>> Should it be fixed in powerpc instead ? In that case, how ? Any
>>>> idea ?
>>>
>>>
>>> Looks like there are several other places where the problem occurs,
>>> so it
>>> has to be fixed in the powerpc headers instead.
>>>
>>> Seems like RISC arch faced the same issue, and fixed it the following
>>> way:
>>>
>>> /*
>>> * This is particularly ugly: it appears we can't actually get the
>>> definition
>>> * of task_struct here, but we need access to the CPU this task is
>>> running
>>> on.
>>> * Instead of using C we're using asm-offsets.h to get the current
>>> processor
>>> * ID.
>>> */
>>> #define raw_smp_processor_id() (*((int*)((char*)get_current() +
>>> TASK_TI_CPU)))
>>>
>>>
>>> Unless someone has a better idea, I'll fixed it that way.
>>
>> To solve this on arm64 we made the cpu number a percpu variable; see
>> commit:
>>
>> 57c82954e77fa12c ("arm64: make cpu number a percpu variable")
>
> Thanks, I'll have a look
>
>> IIUC, you could do that by placing it in paca_struct.
>
> By the way, it is already in PACA struct for PPC64.
> The issue is with PPC32, up to now it was in current_thread_info:
>
> #ifdef CONFIG_PPC64
> #define raw_smp_processor_id() (local_paca->paca_index)
> #define hard_smp_processor_id() (get_paca()->hw_cpu_id)
> #else
> /* 32-bit */
> extern int smp_hw_index[];
>
> #define raw_smp_processor_id() (current_thread_info()->cpu)
> #define hard_smp_processor_id() (smp_hw_index[smp_processor_id()])
>
> [..]
>
> #endif
>
It seems not that easy. Adding the following leads to the below failure.
I'm having a hard time identifying and fixing the issue. Looks again
like a circular thing, because linux/percpu-defs.h is where
raw_cpu_ptr() is defined.
--- a/arch/powerpc/include/asm/smp.h
+++ b/arch/powerpc/include/asm/smp.h
@@ -83,7 +83,14 @@ int is_cpu_dead(unsigned int cpu);
/* 32-bit */
extern int smp_hw_index[];
-#define raw_smp_processor_id() (current_thread_info()->cpu)
+DECLARE_PER_CPU_READ_MOSTLY(unsigned int, cpu_number);
+
+/*
+ * We don't use this_cpu_read(cpu_number) as that has implicit writes to
+ * preempt_count, and associated (compiler) barriers, that we'd like to
avoid
+ * the expense of. If we're preemptible, the value can be stale at use
anyway.
+ */
+#define raw_smp_processor_id() (*this_cpu_ptr(&cpu_number))
#define hard_smp_processor_id() (smp_hw_index[smp_processor_id()])
static inline int get_hard_smp_processor_id(int cpu)
CC arch/powerpc/kernel/asm-offsets.s
In file included from ././include/linux/compiler_types.h:64:0,
from <command-line>:0:
./include/linux/percpu-rwsem.h: In function
'percpu_down_read_preempt_disable':
./include/linux/percpu-defs.h:254:27: error: implicit declaration of
function 'raw_cpu_ptr' [-Werror=implicit-function-declaration]
#define this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
^
./include/linux/compiler-gcc.h:58:26: note: in definition of macro
'RELOC_HIDE'
(typeof(ptr)) (__ptr + (off)); \
^
./include/asm-generic/percpu.h:44:31: note: in expansion of macro
'SHIFT_PERCPU_PTR'
#define arch_raw_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)
^
./include/asm-generic/percpu.h:31:25: note: in expansion of macro
'per_cpu_offset'
#define __my_cpu_offset per_cpu_offset(raw_smp_processor_id())
^
./arch/powerpc/include/asm/smp.h:93:35: note: in expansion of macro
'this_cpu_ptr'
#define raw_smp_processor_id() (*this_cpu_ptr(&cpu_number))
^
./include/asm-generic/percpu.h:31:40: note: in expansion of macro
'raw_smp_processor_id'
#define __my_cpu_offset per_cpu_offset(raw_smp_processor_id())
^
./include/asm-generic/percpu.h:44:53: note: in expansion of macro
'__my_cpu_offset'
#define arch_raw_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)
^
./include/linux/percpu-defs.h:244:2: note: in expansion of macro
'arch_raw_cpu_ptr'
arch_raw_cpu_ptr(ptr); \
^
./include/asm-generic/percpu.h:76:3: note: in expansion of macro
'raw_cpu_ptr'
*raw_cpu_ptr(&(pcp)) op val; \
^
./include/asm-generic/percpu.h:225:34: note: in expansion of macro
'raw_cpu_generic_to_op'
#define raw_cpu_add_1(pcp, val) raw_cpu_generic_to_op(pcp, val, +=)
^
./include/linux/percpu-defs.h:379:11: note: in expansion of macro
'raw_cpu_add_1'
case 1: stem##1(variable, __VA_ARGS__);break; \
^
./include/linux/percpu-defs.h:424:32: note: in expansion of macro
'__pcpu_size_call'
#define raw_cpu_add(pcp, val) __pcpu_size_call(raw_cpu_add_, pcp, val)
^
./include/linux/percpu-defs.h:460:2: note: in expansion of macro
'raw_cpu_add'
raw_cpu_add(pcp, val); \
^
./include/linux/percpu-defs.h:499:30: note: in expansion of macro
'__this_cpu_add'
#define __this_cpu_inc(pcp) __this_cpu_add(pcp, 1)
^
./include/linux/percpu-rwsem.h:47:2: note: in expansion of macro
'__this_cpu_inc'
__this_cpu_inc(*sem->read_count);
^
./arch/powerpc/include/asm/smp.h:93:34: error: invalid type argument of
unary '*' (have 'int')
#define raw_smp_processor_id() (*this_cpu_ptr(&cpu_number))
^
[...]
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2018-09-25 23:57 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2018-09-24 15:52 ` [RFC PATCH v1 1/9] timer: fix circular header dependency Christophe Leroy
2018-09-25 5:34 ` Christophe LEROY
2018-09-25 6:33 ` Christophe LEROY
2018-09-25 12:11 ` Mark Rutland
2018-09-25 12:15 ` Christophe LEROY
2018-09-25 17:48 ` Christophe Leroy
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