Re: [PATCH 4/4] cc-swiotlb: Allow set swiotlb watermark from cmdline

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

Hi GuoRui.Yu",

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/x86/core]
[also build test WARNING on joro-iommu/next driver-core/driver-core-testing driver-core/driver-core-next driver-core/driver-core-linus linus/master v6.2-rc5 next-20230127]
[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/GuoRui-Yu/swiotlb-Add-a-new-cc-swiotlb-implementation-for-Confidential-VMs/20230128-181154
patch link:    https://lore.kernel.org/r/20230128083254.86012-5-GuoRui.Yu%40linux.alibaba.com
patch subject: [PATCH 4/4] cc-swiotlb: Allow set swiotlb watermark from cmdline
config: nios2-buildonly-randconfig-r002-20230129 (https://download.01.org/0day-ci/archive/20230129/202301290417.n1KMDPQt-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 12.1.0
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/fcbd538c875f5f1086682829671935d7155e4029
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review GuoRui-Yu/swiotlb-Add-a-new-cc-swiotlb-implementation-for-Confidential-VMs/20230128-181154
        git checkout fcbd538c875f5f1086682829671935d7155e4029
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=nios2 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=nios2 SHELL=/bin/bash kernel/dma/

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

All warnings (new ones prefixed by >>):

   kernel/dma/cc-swiotlb.c: In function 'swiotlb_bounce':
   kernel/dma/cc-swiotlb.c:200:32: warning: variable 'tlb_end' set but not used [-Wunused-but-set-variable]
     200 |         phys_addr_t orig_addr, tlb_end, slot_start, slot_end = tlb_addr ;
         |                                ^~~~~~~
   In file included from kernel/dma/cc-swiotlb.c:13:
   kernel/dma/cc-swiotlb.c: In function 'cc_populate_pages':
>> include/linux/kern_levels.h:5:25: warning: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'size_t' {aka 'unsigned int'} [-Wformat=]
       5 | #define KERN_SOH        "\001"          /* ASCII Start Of Header */
         |                         ^~~~~~
   include/linux/printk.h:429:25: note: in definition of macro 'printk_index_wrap'
     429 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                         ^~~~
   include/linux/printk.h:530:9: note: in expansion of macro 'printk'
     530 |         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~
   include/linux/kern_levels.h:14:25: note: in expansion of macro 'KERN_SOH'
      14 | #define KERN_INFO       KERN_SOH "6"    /* informational */
         |                         ^~~~~~~~
   include/linux/printk.h:530:16: note: in expansion of macro 'KERN_INFO'
     530 |         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
         |                ^~~~~~~~~
   kernel/dma/cc-swiotlb.c:411:9: note: in expansion of macro 'pr_info'
     411 |         pr_info("bounce buffer size adjusted to %luMB", size >> 20);
         |         ^~~~~~~
   kernel/dma/cc-swiotlb.c: At top level:
   kernel/dma/cc-swiotlb.c:524:13: warning: no previous prototype for 'swiotlb_hint_cpus' [-Wmissing-prototypes]
     524 | void __init swiotlb_hint_cpus(int cpus) {}
         |             ^~~~~~~~~~~~~~~~~


vim +5 include/linux/kern_levels.h

314ba3520e513a Joe Perches 2012-07-30  4  
04d2c8c83d0e3a Joe Perches 2012-07-30 @5  #define KERN_SOH	"\001"		/* ASCII Start Of Header */
04d2c8c83d0e3a Joe Perches 2012-07-30  6  #define KERN_SOH_ASCII	'\001'
04d2c8c83d0e3a Joe Perches 2012-07-30  7  

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