Re: [PATCH v1 06/10] drm/panthor: Implement L2 power on/off via PWR_CONTROL

[kernel test robot <lkp@intel.com>]

Hi Karunika,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-tip/drm-tip linus/master v6.18-rc1 next-20251014]
[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/Karunika-Choo/drm-panthor-Factor-out-GPU_ID-register-read-into-separate-function/20251014-174729
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20251014094337.1009601-7-karunika.choo%40arm.com
patch subject: [PATCH v1 06/10] drm/panthor: Implement L2 power on/off via PWR_CONTROL
config: i386-buildonly-randconfig-002-20251015 (https://download.01.org/0day-ci/archive/20251015/202510151252.aKq1qUWF-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251015/202510151252.aKq1qUWF-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510151252.aKq1qUWF-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/panthor/panthor_pwr.c:6:
   drivers/gpu/drm/panthor/panthor_pwr.c: In function 'panthor_pwr_domain_wait_transition':
>> include/linux/bits.h:49:27: warning: right shift count >= width of type [-Wshift-count-overflow]
      49 |               type_max(t) >> (BITS_PER_TYPE(t) - 1 - (h)))))
         |                           ^~
   include/linux/iopoll.h:145:9: note: in expansion of macro 'poll_timeout_us'
     145 |         poll_timeout_us((val) = op(args), cond, sleep_us, timeout_us, sleep_before_read)
         |         ^~~~~~~~~~~~~~~
   drivers/gpu/drm/panthor/panthor_device.h:533:9: note: in expansion of macro 'read_poll_timeout'
     533 |         read_poll_timeout(gpu_read64, val, cond, delay_us, timeout_us, false,   \
         |         ^~~~~~~~~~~~~~~~~
   drivers/gpu/drm/panthor/panthor_pwr.c:152:15: note: in expansion of macro 'gpu_read64_poll_timeout'
     152 |         ret = gpu_read64_poll_timeout(ptdev, pwrtrans_reg, val,
         |               ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/bits.h:51:33: note: in expansion of macro 'GENMASK_TYPE'
      51 | #define GENMASK(h, l)           GENMASK_TYPE(unsigned long, h, l)
         |                                 ^~~~~~~~~~~~
   drivers/gpu/drm/panthor/panthor_pwr.c:26:41: note: in expansion of macro 'GENMASK'
      26 | #define PWR_ALL_CORES_MASK              GENMASK(63, 0)
         |                                         ^~~~~~~
   drivers/gpu/drm/panthor/panthor_pwr.c:153:41: note: in expansion of macro 'PWR_ALL_CORES_MASK'
     153 |                                       !(PWR_ALL_CORES_MASK & val), 100,
         |                                         ^~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/panthor/panthor_pwr.c: In function 'retract_domain':
>> include/vdso/bits.h:7:40: warning: left shift count >= width of type [-Wshift-count-overflow]
       7 | #define BIT(nr)                 (UL(1) << (nr))
         |                                        ^~
   include/linux/iopoll.h:49:21: note: in definition of macro 'poll_timeout_us'
      49 |                 if (cond) { \
         |                     ^~~~
   drivers/gpu/drm/panthor/panthor_device.h:533:9: note: in expansion of macro 'read_poll_timeout'
     533 |         read_poll_timeout(gpu_read64, val, cond, delay_us, timeout_us, false,   \
         |         ^~~~~~~~~~~~~~~~~
   drivers/gpu/drm/panthor/panthor_pwr.c:259:15: note: in expansion of macro 'gpu_read64_poll_timeout'
     259 |         ret = gpu_read64_poll_timeout(ptdev, PWR_STATUS, val,
         |               ^~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/panthor/panthor_regs.h:249:57: note: in expansion of macro 'BIT'
     249 | #define   PWR_STATUS_RETRACT_PENDING                    BIT(43)
         |                                                         ^~~
   drivers/gpu/drm/panthor/panthor_pwr.c:260:41: note: in expansion of macro 'PWR_STATUS_RETRACT_PENDING'
     260 |                                       !(PWR_STATUS_RETRACT_PENDING & val), 0,
         |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +49 include/linux/bits.h

31299a5e021124 Vincent Mailhol 2025-03-26  35  
19408200c09485 Vincent Mailhol 2025-03-26  36  /*
19408200c09485 Vincent Mailhol 2025-03-26  37   * Generate a mask for the specified type @t. Additional checks are made to
19408200c09485 Vincent Mailhol 2025-03-26  38   * guarantee the value returned fits in that type, relying on
19408200c09485 Vincent Mailhol 2025-03-26  39   * -Wshift-count-overflow compiler check to detect incompatible arguments.
19408200c09485 Vincent Mailhol 2025-03-26  40   * For example, all these create build errors or warnings:
19408200c09485 Vincent Mailhol 2025-03-26  41   *
19408200c09485 Vincent Mailhol 2025-03-26  42   * - GENMASK(15, 20): wrong argument order
19408200c09485 Vincent Mailhol 2025-03-26  43   * - GENMASK(72, 15): doesn't fit unsigned long
19408200c09485 Vincent Mailhol 2025-03-26  44   * - GENMASK_U32(33, 15): doesn't fit in a u32
19408200c09485 Vincent Mailhol 2025-03-26  45   */
19408200c09485 Vincent Mailhol 2025-03-26  46  #define GENMASK_TYPE(t, h, l)					\
19408200c09485 Vincent Mailhol 2025-03-26  47  	((t)(GENMASK_INPUT_CHECK(h, l) +			\
19408200c09485 Vincent Mailhol 2025-03-26  48  	     (type_max(t) << (l) &				\
19408200c09485 Vincent Mailhol 2025-03-26 @49  	      type_max(t) >> (BITS_PER_TYPE(t) - 1 - (h)))))
19408200c09485 Vincent Mailhol 2025-03-26  50  

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