[PATCH] arm64: mm: set ZONE_DMA size based on early IORT scan

[kernel test robot]

Hi Ard,

I love your patch! Perhaps something to improve:

[auto build test WARNING on arm64/for-next/core]
[also build test WARNING on arm/for-next soc/for-next kvmarm/next v5.9 next-20201009]
[cannot apply to xlnx/master]
[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/0day-ci/linux/commits/Ard-Biesheuvel/arm64-mm-set-ZONE_DMA-size-based-on-early-IORT-scan/20201011-071053
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: arm64-randconfig-s031-20201012 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-rc1-dirty
        # https://github.com/0day-ci/linux/commit/887b39ea481d299f24bd5ed803deec25e61ac6ec
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Ard-Biesheuvel/arm64-mm-set-ZONE_DMA-size-based-on-early-IORT-scan/20201011-071053
        git checkout 887b39ea481d299f24bd5ed803deec25e61ac6ec
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64 

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

All warnings (new ones prefixed by >>):

   drivers/acpi/arm64/iort.c:1725:21: warning: no previous prototype for 'acpi_iort_get_zone_dma_size' [-Wmissing-prototypes]
    1725 | unsigned int __init acpi_iort_get_zone_dma_size(void)
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/acpi/arm64/iort.c: In function 'acpi_iort_get_zone_dma_size':
   drivers/acpi/arm64/iort.c:1760:33: warning: suggest braces around empty body in an 'if' statement [-Wempty-body]
    1760 |    if (rc->memory_address_limit);
         |                                 ^
   In file included from include/linux/ioport.h:13,
                    from include/linux/acpi.h:12,
                    from include/linux/acpi_iort.h:10,
                    from drivers/acpi/arm64/iort.c:13:
>> include/linux/compiler.h:56:23: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
      56 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
         |                       ^~
   drivers/acpi/arm64/iort.c:1760:4: note: in expansion of macro 'if'
    1760 |    if (rc->memory_address_limit);
         |    ^~
   drivers/acpi/arm64/iort.c:1761:5: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
    1761 |     limit = min(limit, rc->memory_address_limit);
         |     ^~~~~

vim +/if +56 include/linux/compiler.h

2bcd521a684cc9 Steven Rostedt 2008-11-21  50  
2bcd521a684cc9 Steven Rostedt 2008-11-21  51  #ifdef CONFIG_PROFILE_ALL_BRANCHES
2bcd521a684cc9 Steven Rostedt 2008-11-21  52  /*
2bcd521a684cc9 Steven Rostedt 2008-11-21  53   * "Define 'is'", Bill Clinton
2bcd521a684cc9 Steven Rostedt 2008-11-21  54   * "Define 'if'", Steven Rostedt
2bcd521a684cc9 Steven Rostedt 2008-11-21  55   */
a15fd609ad53a6 Linus Torvalds 2019-03-20 @56  #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
a15fd609ad53a6 Linus Torvalds 2019-03-20  57  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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