Re: [PATCH 14/20] ACPICA: executer/exsystem: Inform users about ACPI spec violation

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

Hi "Rafael,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on rafael-pm/linux-next]
[also build test ERROR on linus/master linux/master v5.18-rc2 next-20220411]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/Rafael-J-Wysocki/ACPICA-ACPICA-20220331/20220412-030922
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
config: i386-randconfig-a006-20220411 (https://download.01.org/0day-ci/archive/20220412/202204121052.HOrN6tpw-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project fe2478d44e4f7f191c43fef629ac7a23d0251e72)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/5cdc6166cc35043a80f5f328d6e6b58190c4e46c
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Rafael-J-Wysocki/ACPICA-ACPICA-20220331/20220412-030922
        git checkout 5cdc6166cc35043a80f5f328d6e6b58190c4e46c
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

Note: the linux-review/Rafael-J-Wysocki/ACPICA-ACPICA-20220331/20220412-030922 HEAD 32181ae3d3173aeee41f709612dfa4d52951b39d builds fine.
      It only hurts bisectability.

All errors (new ones prefixed by >>):

>> drivers/acpi/acpica/exsystem.c:140:7: error: use of undeclared identifier 'how_long_US'; did you mean 'how_long_us'?
                   if (how_long_US > 100) {
                       ^~~~~~~~~~~
                       how_long_us
   drivers/acpi/acpica/exsystem.c:123:41: note: 'how_long_us' declared here
   acpi_status acpi_ex_system_do_stall(u32 how_long_us)
                                           ^
   1 error generated.


vim +140 drivers/acpi/acpica/exsystem.c

   105	
   106	/*******************************************************************************
   107	 *
   108	 * FUNCTION:    acpi_ex_system_do_stall
   109	 *
   110	 * PARAMETERS:  how_long_us     - The amount of time to stall,
   111	 *                                in microseconds
   112	 *
   113	 * RETURN:      Status
   114	 *
   115	 * DESCRIPTION: Suspend running thread for specified amount of time.
   116	 *              Note: ACPI specification requires that Stall() does not
   117	 *              relinquish the processor, and delays longer than 100 usec
   118	 *              should use Sleep() instead. We allow stalls up to 255 usec
   119	 *              for compatibility with other interpreters and existing BIOSs.
   120	 *
   121	 ******************************************************************************/
   122	
   123	acpi_status acpi_ex_system_do_stall(u32 how_long_us)
   124	{
   125		acpi_status status = AE_OK;
   126	
   127		ACPI_FUNCTION_ENTRY();
   128	
   129		if (how_long_us > 255) {
   130			/*
   131			 * Longer than 255 microseconds, this is an error
   132			 *
   133			 * (ACPI specifies 100 usec as max, but this gives some slack in
   134			 * order to support existing BIOSs)
   135			 */
   136			ACPI_ERROR((AE_INFO,
   137				    "Time parameter is too large (%u)", how_long_us));
   138			status = AE_AML_OPERAND_VALUE;
   139		} else {
 > 140			if (how_long_US > 100) {
   141				ACPI_WARNING((AE_INFO,
   142					      "Time parameter %u us > 100 us violating ACPI spec, please fix the firmware.",
   143					      how_long_us));
   144			}
   145			acpi_os_stall(how_long_us);
   146		}
   147	
   148		return (status);
   149	}
   150	

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