diff mbox series

[1/2] drivers/nvdimm: Fix build failure when CONFIG_PERF_EVENTS is not set

Message ID 20220318114133.113627-1-kjain@linux.ibm.com (mailing list archive)
State Superseded
Headers show
Series [1/2] drivers/nvdimm: Fix build failure when CONFIG_PERF_EVENTS is not set | expand

Commit Message

kajoljain March 18, 2022, 11:41 a.m. UTC 
The following build failure occures when CONFIG_PERF_EVENTS is not set
as generic pmu functions are not visible in that scenario.

|-- s390-randconfig-r044-20220313
|   |-- nd_perf.c:(.text):undefined-reference-to-perf_pmu_migrate_context
|   |-- nd_perf.c:(.text):undefined-reference-to-perf_pmu_register
|   `-- nd_perf.c:(.text):undefined-reference-to-perf_pmu_unregister

Similar build failure in nds32 architecture:
nd_perf.c:(.text+0x21e): undefined reference to `perf_pmu_migrate_context'
nd_perf.c:(.text+0x434): undefined reference to `perf_pmu_register'
nd_perf.c:(.text+0x57c): undefined reference to `perf_pmu_unregister'

Fix this issue by adding check for CONFIG_PERF_EVENTS config option
and disabling the nvdimm perf interface incase this config is not set.

Also removed function declaration of perf_pmu_migrate_context,
perf_pmu_register, perf_pmu_unregister functions from nd.h as these are
common pmu functions which are part of perf_event.h and since we
are disabling nvdimm perf interface incase CONFIG_PERF_EVENTS option
is not set, we not need to declare them in nd.h

Fixes: 0fab1ba6ad6b ("drivers/nvdimm: Add perf interface to expose
nvdimm performance stats") (Commit id based on linux-next tree)
Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Link: https://lore.kernel.org/all/62317124.YBQFU33+s%2FwdvWGj%25lkp@intel.com/
Reported-by: kernel test robot <lkp@intel.com>
---
 drivers/nvdimm/Makefile | 2 +-
 include/linux/nd.h      | 7 ++++---
 2 files changed, 5 insertions(+), 4 deletions(-)

---
- This fix patch changes are added and tested on top of linux-next tree
  on the 'next-20220315' branch.
---

Comments

Dan Williams March 22, 2022, 2:10 a.m. UTC | #1 
On Fri, Mar 18, 2022 at 4:42 AM Kajol Jain <kjain@linux.ibm.com> wrote:
>
> The following build failure occures when CONFIG_PERF_EVENTS is not set
> as generic pmu functions are not visible in that scenario.
>
> |-- s390-randconfig-r044-20220313
> |   |-- nd_perf.c:(.text):undefined-reference-to-perf_pmu_migrate_context
> |   |-- nd_perf.c:(.text):undefined-reference-to-perf_pmu_register
> |   `-- nd_perf.c:(.text):undefined-reference-to-perf_pmu_unregister
>
> Similar build failure in nds32 architecture:
> nd_perf.c:(.text+0x21e): undefined reference to `perf_pmu_migrate_context'
> nd_perf.c:(.text+0x434): undefined reference to `perf_pmu_register'
> nd_perf.c:(.text+0x57c): undefined reference to `perf_pmu_unregister'
>
> Fix this issue by adding check for CONFIG_PERF_EVENTS config option
> and disabling the nvdimm perf interface incase this config is not set.
>
> Also removed function declaration of perf_pmu_migrate_context,
> perf_pmu_register, perf_pmu_unregister functions from nd.h as these are
> common pmu functions which are part of perf_event.h and since we
> are disabling nvdimm perf interface incase CONFIG_PERF_EVENTS option
> is not set, we not need to declare them in nd.h
>
> Fixes: 0fab1ba6ad6b ("drivers/nvdimm: Add perf interface to expose
> nvdimm performance stats") (Commit id based on linux-next tree)
> Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
> Link: https://lore.kernel.org/all/62317124.YBQFU33+s%2FwdvWGj%25lkp@intel.com/
> Reported-by: kernel test robot <lkp@intel.com>
> ---
>  drivers/nvdimm/Makefile | 2 +-
>  include/linux/nd.h      | 7 ++++---
>  2 files changed, 5 insertions(+), 4 deletions(-)
>
> ---
> - This fix patch changes are added and tested on top of linux-next tree
>   on the 'next-20220315' branch.
> ---
> diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
> index 3fb806748716..ba0296dca9db 100644
> --- a/drivers/nvdimm/Makefile
> +++ b/drivers/nvdimm/Makefile
> @@ -15,7 +15,7 @@ nd_e820-y := e820.o
>  libnvdimm-y := core.o
>  libnvdimm-y += bus.o
>  libnvdimm-y += dimm_devs.o
> -libnvdimm-y += nd_perf.o
> +libnvdimm-$(CONFIG_PERF_EVENTS) += nd_perf.o
>  libnvdimm-y += dimm.o
>  libnvdimm-y += region_devs.o
>  libnvdimm-y += region.o
> diff --git a/include/linux/nd.h b/include/linux/nd.h
> index 7b2ccbdc1cbc..a4265eaf5ae8 100644
> --- a/include/linux/nd.h
> +++ b/include/linux/nd.h
> @@ -8,8 +8,10 @@
>  #include <linux/ndctl.h>
>  #include <linux/device.h>
>  #include <linux/badblocks.h>
> +#ifdef CONFIG_PERF_EVENTS
>  #include <linux/perf_event.h>

Why must this not be included? Doesn't it already handle the
CONFIG_PERF_EVENTS=n case internally?

>  #include <linux/platform_device.h>

I notice now that this platform-device header should have never been
added in the first place, just forward declare:

struct platform_device;

> +#endif
>
>  enum nvdimm_event {
>         NVDIMM_REVALIDATE_POISON,
> @@ -25,6 +27,7 @@ enum nvdimm_claim_class {
>         NVDIMM_CCLASS_UNKNOWN,
>  };
>
> +#ifdef CONFIG_PERF_EVENTS
>  #define NVDIMM_EVENT_VAR(_id)  event_attr_##_id
>  #define NVDIMM_EVENT_PTR(_id)  (&event_attr_##_id.attr.attr)

Why must these be inside the ifdef guard?

>
> @@ -63,9 +66,7 @@ extern ssize_t nvdimm_events_sysfs_show(struct device *dev,
>
>  int register_nvdimm_pmu(struct nvdimm_pmu *nvdimm, struct platform_device *pdev);
>  void unregister_nvdimm_pmu(struct nvdimm_pmu *nd_pmu);

Shouldn't there also be stub functions in the CONFIG_PERF_EVENTS=n case?

static inline int register_nvdimm_pmu(struct nvdimm_pmu *nvdimm,
struct platform_device *pdev)
{
    return -ENXIO;
}

static inline void unregister_nvdimm_pmu(struct nvdimm_pmu *nd_pmu)
{
}

> -void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu);
> -int perf_pmu_register(struct pmu *pmu, const char *name, int type);
> -void perf_pmu_unregister(struct pmu *pmu);

Yeah, I should have caught these earlier.

> +#endif
>
>  struct nd_device_driver {
>         struct device_driver drv;
> --
> 2.31.1
>
kajoljain March 23, 2022, 4:43 p.m. UTC | #2 
On 3/22/22 07:40, Dan Williams wrote:
> On Fri, Mar 18, 2022 at 4:42 AM Kajol Jain <kjain@linux.ibm.com> wrote:
>>
>> The following build failure occures when CONFIG_PERF_EVENTS is not set
>> as generic pmu functions are not visible in that scenario.
>>
>> |-- s390-randconfig-r044-20220313
>> |   |-- nd_perf.c:(.text):undefined-reference-to-perf_pmu_migrate_context
>> |   |-- nd_perf.c:(.text):undefined-reference-to-perf_pmu_register
>> |   `-- nd_perf.c:(.text):undefined-reference-to-perf_pmu_unregister
>>
>> Similar build failure in nds32 architecture:
>> nd_perf.c:(.text+0x21e): undefined reference to `perf_pmu_migrate_context'
>> nd_perf.c:(.text+0x434): undefined reference to `perf_pmu_register'
>> nd_perf.c:(.text+0x57c): undefined reference to `perf_pmu_unregister'
>>
>> Fix this issue by adding check for CONFIG_PERF_EVENTS config option
>> and disabling the nvdimm perf interface incase this config is not set.
>>
>> Also removed function declaration of perf_pmu_migrate_context,
>> perf_pmu_register, perf_pmu_unregister functions from nd.h as these are
>> common pmu functions which are part of perf_event.h and since we
>> are disabling nvdimm perf interface incase CONFIG_PERF_EVENTS option
>> is not set, we not need to declare them in nd.h
>>
>> Fixes: 0fab1ba6ad6b ("drivers/nvdimm: Add perf interface to expose
>> nvdimm performance stats") (Commit id based on linux-next tree)
>> Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
>> Link: https://lore.kernel.org/all/62317124.YBQFU33+s%2FwdvWGj%25lkp@intel.com/
>> Reported-by: kernel test robot <lkp@intel.com>
>> ---
>>  drivers/nvdimm/Makefile | 2 +-
>>  include/linux/nd.h      | 7 ++++---
>>  2 files changed, 5 insertions(+), 4 deletions(-)
>>
>> ---
>> - This fix patch changes are added and tested on top of linux-next tree
>>   on the 'next-20220315' branch.
>> ---
>> diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
>> index 3fb806748716..ba0296dca9db 100644
>> --- a/drivers/nvdimm/Makefile
>> +++ b/drivers/nvdimm/Makefile
>> @@ -15,7 +15,7 @@ nd_e820-y := e820.o
>>  libnvdimm-y := core.o
>>  libnvdimm-y += bus.o
>>  libnvdimm-y += dimm_devs.o
>> -libnvdimm-y += nd_perf.o
>> +libnvdimm-$(CONFIG_PERF_EVENTS) += nd_perf.o
>>  libnvdimm-y += dimm.o
>>  libnvdimm-y += region_devs.o
>>  libnvdimm-y += region.o
>> diff --git a/include/linux/nd.h b/include/linux/nd.h
>> index 7b2ccbdc1cbc..a4265eaf5ae8 100644
>> --- a/include/linux/nd.h
>> +++ b/include/linux/nd.h
>> @@ -8,8 +8,10 @@
>>  #include <linux/ndctl.h>
>>  #include <linux/device.h>
>>  #include <linux/badblocks.h>
>> +#ifdef CONFIG_PERF_EVENTS
>>  #include <linux/perf_event.h>
> 
> Why must this not be included? Doesn't it already handle the
> CONFIG_PERF_EVENTS=n case internally?
> 
>>  #include <linux/platform_device.h>
> 
> I notice now that this platform-device header should have never been
> added in the first place, just forward declare:
> 
> struct platform_device;

Hi Dan,
    Sure I will do the required changes.

Thanks,
Kajol Jain
> 
>> +#endif
>>
>>  enum nvdimm_event {
>>         NVDIMM_REVALIDATE_POISON,
>> @@ -25,6 +27,7 @@ enum nvdimm_claim_class {
>>         NVDIMM_CCLASS_UNKNOWN,
>>  };
>>
>> +#ifdef CONFIG_PERF_EVENTS
>>  #define NVDIMM_EVENT_VAR(_id)  event_attr_##_id
>>  #define NVDIMM_EVENT_PTR(_id)  (&event_attr_##_id.attr.attr)
> 
> Why must these be inside the ifdef guard?
> 
>>
>> @@ -63,9 +66,7 @@ extern ssize_t nvdimm_events_sysfs_show(struct device *dev,
>>
>>  int register_nvdimm_pmu(struct nvdimm_pmu *nvdimm, struct platform_device *pdev);
>>  void unregister_nvdimm_pmu(struct nvdimm_pmu *nd_pmu);
> 
> Shouldn't there also be stub functions in the CONFIG_PERF_EVENTS=n case?
> 
> static inline int register_nvdimm_pmu(struct nvdimm_pmu *nvdimm,
> struct platform_device *pdev)
> {
>     return -ENXIO;
> }
> 
> static inline void unregister_nvdimm_pmu(struct nvdimm_pmu *nd_pmu)
> {
> }
> 
>> -void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu);
>> -int perf_pmu_register(struct pmu *pmu, const char *name, int type);
>> -void perf_pmu_unregister(struct pmu *pmu);
> 
> Yeah, I should have caught these earlier.
> 
>> +#endif
>>
>>  struct nd_device_driver {
>>         struct device_driver drv;
>> --
>> 2.31.1
>>
diff mbox series

Patch

diff --git a/drivers/nvdimm/Makefile b/drivers/nvdimm/Makefile
index 3fb806748716..ba0296dca9db 100644
--- a/drivers/nvdimm/Makefile
+++ b/drivers/nvdimm/Makefile
@@ -15,7 +15,7 @@  nd_e820-y := e820.o
 libnvdimm-y := core.o
 libnvdimm-y += bus.o
 libnvdimm-y += dimm_devs.o
-libnvdimm-y += nd_perf.o
+libnvdimm-$(CONFIG_PERF_EVENTS) += nd_perf.o
 libnvdimm-y += dimm.o
 libnvdimm-y += region_devs.o
 libnvdimm-y += region.o
diff --git a/include/linux/nd.h b/include/linux/nd.h
index 7b2ccbdc1cbc..a4265eaf5ae8 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -8,8 +8,10 @@ 
 #include <linux/ndctl.h>
 #include <linux/device.h>
 #include <linux/badblocks.h>
+#ifdef CONFIG_PERF_EVENTS
 #include <linux/perf_event.h>
 #include <linux/platform_device.h>
+#endif
 
 enum nvdimm_event {
 	NVDIMM_REVALIDATE_POISON,
@@ -25,6 +27,7 @@  enum nvdimm_claim_class {
 	NVDIMM_CCLASS_UNKNOWN,
 };
 
+#ifdef CONFIG_PERF_EVENTS
 #define NVDIMM_EVENT_VAR(_id)  event_attr_##_id
 #define NVDIMM_EVENT_PTR(_id)  (&event_attr_##_id.attr.attr)
 
@@ -63,9 +66,7 @@  extern ssize_t nvdimm_events_sysfs_show(struct device *dev,
 
 int register_nvdimm_pmu(struct nvdimm_pmu *nvdimm, struct platform_device *pdev);
 void unregister_nvdimm_pmu(struct nvdimm_pmu *nd_pmu);
-void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu);
-int perf_pmu_register(struct pmu *pmu, const char *name, int type);
-void perf_pmu_unregister(struct pmu *pmu);
+#endif
 
 struct nd_device_driver {
 	struct device_driver drv;