[lpieralisi:dev/acpi-static-table-gsi-deferral 6/13] drivers/clocksource/arm_arch_timer_mmio.c:208:8: error: call to undeclared function 'acpi_register_gsi'; ISO C99 and later do not support implicit function declarations

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git dev/acpi-static-table-gsi-deferral
head:   57e5c004a108c62e38be743a8e66e3cae00ca521
commit: cb41cb5a5932af1185e1b4c865abc9116e3d7e63 [6/13] clocksource: Implement arch mem timer deferred probe
config: arm-exynos_defconfig (https://download.01.org/0day-ci/archive/20260911/202609111011.7NQxSpZ0-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260911/202609111011.7NQxSpZ0-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/202609111011.7NQxSpZ0-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/clocksource/arm_arch_timer_mmio.c:208:8: error: call to undeclared function 'acpi_register_gsi'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     208 |         ret = acpi_register_gsi(&pdev->dev, gsi, trigger, polarity);
         |               ^
   1 error generated.


vim +/acpi_register_gsi +208 drivers/clocksource/arm_arch_timer_mmio.c

   194	
   195	static int arch_timer_mmio_map_gsi(struct platform_device *pdev, u32 gsi,
   196					   u32 flags, int *irq)
   197	{
   198		int trigger, polarity, ret;
   199	
   200		if (!gsi || *irq)
   201			return 0;
   202	
   203		trigger = (flags & ACPI_GTDT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE
   204							     : ACPI_LEVEL_SENSITIVE;
   205		polarity = (flags & ACPI_GTDT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW
   206								  : ACPI_ACTIVE_HIGH;
   207	
 > 208		ret = acpi_register_gsi(&pdev->dev, gsi, trigger, polarity);
   209		if (ret < 0)
   210			return ret;
   211	
   212		*irq = ret;
   213	
   214		return 0;
   215	}
   216	

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