[PATCH 1/2] pwm: make it possible to apply pwm changes in atomic context

[kernel test robot]

Hi Sean,

kernel test robot noticed the following build errors:

[auto build test ERROR on thierry-reding-pwm/for-next]
[also build test ERROR on shawnguo/for-next atorgue-stm32/stm32-next media-tree/master linus/master v6.6-rc3 next-20230929]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Sean-Young/media-pwm-ir-tx-trigger-edges-from-hrtimer-interrupt-context/20231001-194056
base:   https://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm.git for-next
patch link:    https://lore.kernel.org/r/1bd5241d584ceb4d6b731c4dc3203fb9686ee1d1.1696156485.git.sean%40mess.org
patch subject: [PATCH 1/2] pwm: make it possible to apply pwm changes in atomic context
config: arm-randconfig-002-20231001 (https://download.01.org/0day-ci/archive/20231001/202310012229.ldJwkjOY-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231001/202310012229.ldJwkjOY-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310012229.ldJwkjOY-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/cpumask.h:10,
                    from include/linux/smp.h:13,
                    from include/linux/lockdep.h:14,
                    from include/linux/spinlock.h:63,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:7,
                    from include/linux/slab.h:16,
                    from include/linux/resource_ext.h:11,
                    from include/linux/acpi.h:13,
                    from include/linux/i2c.h:13,
                    from drivers/input/misc/da7280.c:12:
   include/linux/pwm.h: In function 'pwm_apply_state':
>> include/linux/pwm.h:428:24: error: implicit declaration of function 'pwm_can_sleep'; did you mean 'cant_sleep'? [-Werror=implicit-function-declaration]
     428 |         might_sleep_if(pwm_can_sleep(pwm));
         |                        ^~~~~~~~~~~~~
   include/linux/kernel.h:194:39: note: in definition of macro 'might_sleep_if'
     194 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
         |                                       ^~~~
   In file included from drivers/input/misc/da7280.c:16:
   include/linux/pwm.h: At top level:
>> include/linux/pwm.h:455:20: error: conflicting types for 'pwm_can_sleep'; have 'bool(struct pwm_device *)' {aka '_Bool(struct pwm_device *)'}
     455 | static inline bool pwm_can_sleep(struct pwm_device *pwm)
         |                    ^~~~~~~~~~~~~
   include/linux/pwm.h:428:24: note: previous implicit declaration of 'pwm_can_sleep' with type 'int()'
     428 |         might_sleep_if(pwm_can_sleep(pwm));
         |                        ^~~~~~~~~~~~~
   include/linux/kernel.h:194:39: note: in definition of macro 'might_sleep_if'
     194 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
         |                                       ^~~~
   cc1: some warnings being treated as errors


vim +428 include/linux/pwm.h

   419	
   420	struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id);
   421	struct pwm_device *devm_fwnode_pwm_get(struct device *dev,
   422					       struct fwnode_handle *fwnode,
   423					       const char *con_id);
   424	#else
   425	static inline int pwm_apply_state(struct pwm_device *pwm,
   426					  const struct pwm_state *state)
   427	{
 > 428		might_sleep_if(pwm_can_sleep(pwm));
   429		return -ENOTSUPP;
   430	}
   431	
   432	static inline int pwm_adjust_config(struct pwm_device *pwm)
   433	{
   434		return -ENOTSUPP;
   435	}
   436	
   437	static inline int pwm_config(struct pwm_device *pwm, int duty_ns,
   438				     int period_ns)
   439	{
   440		might_sleep_if(pwm_can_sleep(pwm));
   441		return -EINVAL;
   442	}
   443	
   444	static inline int pwm_enable(struct pwm_device *pwm)
   445	{
   446		might_sleep_if(pwm_can_sleep(pwm));
   447		return -EINVAL;
   448	}
   449	
   450	static inline void pwm_disable(struct pwm_device *pwm)
   451	{
   452		might_sleep_if(pwm_can_sleep(pwm));
   453	}
   454	
 > 455	static inline bool pwm_can_sleep(struct pwm_device *pwm)
   456	{
   457		return true;
   458	}
   459	

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