Re: [PATCH] LoongArch: Use TLB for ioremap()

[kernel test robot]

Hi Huacai,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.0-rc1 next-20220815]
[cannot apply to soc/for-next]
[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/Huacai-Chen/LoongArch-Use-TLB-for-ioremap/20220815-204842
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 568035b01cfb107af8d2e4bd2fb9aea22cf5b868
config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20220816/202208160215.TXzFu9Xd-lkp@xxxxxxxxx/config)
compiler: loongarch64-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/0cdab71896d6b3b3b3f540f80d6f041a0c592e7a
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Huacai-Chen/LoongArch-Use-TLB-for-ioremap/20220815-204842
        git checkout 0cdab71896d6b3b3b3f540f80d6f041a0c592e7a
        # 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=loongarch SHELL=/bin/bash arch/loongarch/

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

All warnings (new ones prefixed by >>):

   arch/loongarch/mm/init.c: In function 'fixmap_pte':
>> arch/loongarch/mm/init.c:171:24: warning: variable 'new' set but not used [-Wunused-but-set-variable]
     171 |                 pud_t *new;
         |                        ^~~
>> arch/loongarch/mm/init.c:187:26: warning: passing argument 1 of 'pmd_init' makes integer from pointer without a cast [-Wint-conversion]
     187 |                 pmd_init(new);
         |                          ^~~
         |                          |
         |                          pmd_t *
   In file included from include/linux/pgtable.h:6,
                    from include/linux/mm.h:29,
                    from include/linux/pagemap.h:8,
                    from arch/loongarch/mm/init.c:14:
   arch/loongarch/include/asm/pgtable.h:245:36: note: expected 'long unsigned int' but argument is of type 'pmd_t *'
     245 | extern void pmd_init(unsigned long page, unsigned long pagetable);
         |                      ~~~~~~~~~~~~~~^~~~
   arch/loongarch/mm/init.c:187:17: error: too few arguments to function 'pmd_init'
     187 |                 pmd_init(new);
         |                 ^~~~~~~~
   In file included from arch/loongarch/mm/init.c:35:
   arch/loongarch/include/asm/pgalloc.h:48:13: note: declared here
      48 | extern void pmd_init(unsigned long page, unsigned long pagetable);
         |             ^~~~~~~~


vim +/new +171 arch/loongarch/mm/init.c

   159	
   160	static pte_t *fixmap_pte(unsigned long addr)
   161	{
   162		pgd_t *pgd;
   163		p4d_t *p4d;
   164		pud_t *pud;
   165		pmd_t *pmd;
   166	
   167		pgd = pgd_offset_k(addr);
   168		p4d = p4d_offset(pgd, addr);
   169	
   170		if (pgd_none(*pgd)) {
 > 171			pud_t *new;
   172	
   173			new = memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
   174			pgd_populate(&init_mm, pgd, new);
   175	#ifndef __PAGETABLE_PUD_FOLDED
   176			pud_init(new);
   177	#endif
   178		}
   179	
   180		pud = pud_offset(p4d, addr);
   181		if (pud_none(*pud)) {
   182			pmd_t *new;
   183	
   184			new = memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
   185			pud_populate(&init_mm, pud, new);
   186	#ifndef __PAGETABLE_PMD_FOLDED
 > 187			pmd_init(new);
   188	#endif
   189		}
   190	
   191		pmd = pmd_offset(pud, addr);
   192		if (pmd_none(*pmd)) {
   193			pte_t *new;
   194	
   195			new = memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
   196			pmd_populate_kernel(&init_mm, pmd, new);
   197		}
   198	
   199		return pte_offset_kernel(pmd, addr);
   200	}
   201	

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