Re: [PATCH] mailbox: pcc: support polling mode when there is no platform IRQ

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

Hi Andrea,

kernel test robot noticed the following build errors:

[auto build test ERROR on rafael-pm/linux-next]
[also build test ERROR on rafael-pm/bleeding-edge jassibrar-mailbox/for-next linus/master v6.18-rc5 next-20251111]
[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/Andrea-Tomassetti/mailbox-pcc-support-polling-mode-when-there-is-no-platform-IRQ/20251110-232950
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20251110150825.3548819-1-andrea.tomassetti%40sipearl.com
patch subject: [PATCH] mailbox: pcc: support polling mode when there is no platform IRQ
config: i386-buildonly-randconfig-002-20251112 (https://download.01.org/0day-ci/archive/20251112/202511120729.R3XQNSnx-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/20251112/202511120729.R3XQNSnx-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/202511120729.R3XQNSnx-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: drivers/acpi/acpi_pcc.o: in function `acpi_pcc_address_space_handler':
>> drivers/acpi/acpi_pcc.c:148:(.text+0x7e): undefined reference to `__udivdi3'

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for OF_GPIO
   Depends on [n]: GPIOLIB [=y] && OF [=n] && HAS_IOMEM [=y]
   Selected by [y]:
   - GPIO_TB10X [=y] && GPIOLIB [=y] && HAS_IOMEM [=y] && (ARC_PLAT_TB10X || COMPILE_TEST [=y])
   WARNING: unmet direct dependencies detected for GPIO_SYSCON
   Depends on [n]: GPIOLIB [=y] && HAS_IOMEM [=y] && MFD_SYSCON [=y] && OF [=n]
   Selected by [m]:
   - GPIO_SAMA5D2_PIOBU [=m] && GPIOLIB [=y] && HAS_IOMEM [=y] && MFD_SYSCON [=y] && OF_GPIO [=y] && (ARCH_AT91 || COMPILE_TEST [=y])
   WARNING: unmet direct dependencies detected for I2C_K1
   Depends on [n]: I2C [=y] && HAS_IOMEM [=y] && (ARCH_SPACEMIT || COMPILE_TEST [=y]) && OF [=n]
   Selected by [m]:
   - MFD_SPACEMIT_P1 [=m] && HAS_IOMEM [=y] && (ARCH_SPACEMIT || COMPILE_TEST [=y]) && I2C [=y]


vim +148 drivers/acpi/acpi_pcc.c

   124	
   125	static acpi_status
   126	acpi_pcc_address_space_handler(u32 function, acpi_physical_address addr,
   127				       u32 bits, acpi_integer *value,
   128				       void *handler_context, void *region_context)
   129	{
   130		acpi_status ret;
   131		struct pcc_data *data = region_context;
   132		u64 usecs_lat;
   133		bool use_polling = data->pcc_chan->mchan->mbox->txdone_poll;
   134	
   135		reinit_completion(&data->done);
   136	
   137		/* Write to Shared Memory */
   138		memcpy_toio(data->pcc_chan->shmem, (void *)value, data->ctx.length);
   139	
   140		/*
   141		 * pcc_chan->latency is just a Nominal value. In reality the remote
   142		 * processor could be much slower to reply. So add an arbitrary
   143		 * amount of wait on top of Nominal.
   144		 */
   145		usecs_lat = PCC_CMD_WAIT_RETRIES_NUM * data->pcc_chan->latency;
   146	
   147		data->cl.tx_block = use_polling;
 > 148		data->cl.tx_tout = usecs_lat / USEC_PER_MSEC;
   149	
   150		if (use_polling)
   151			ret = acpi_pcc_send_msg_polling(data);
   152		else
   153			ret = acpi_pcc_send_msg_irq(data);
   154	
   155		memcpy_fromio(value, data->pcc_chan->shmem, data->ctx.length);
   156	
   157		return ret;
   158	}
   159	

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