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

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Date:   Tue, 16 Aug 2022 02:29:24 +0800
From:   kernel test robot <lkp@...el.com>
To:     Huacai Chen <chenhuacai@...ngson.cn>,
        Arnd Bergmann <arnd@...db.de>,
        Huacai Chen <chenhuacai@...nel.org>
Cc:     kbuild-all@...ts.01.org, loongarch@...ts.linux.dev,
        linux-arch@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>,
        Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] LoongArch: Use TLB for ioremap()

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-buildonly-randconfig-r003-20220815 (https://download.01.org/0day-ci/archive/20220816/202208160237.kJBIqapz-lkp@intel.com/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
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 ARCH=loongarch 

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

All warnings (new ones prefixed by >>):

   arch/loongarch/mm/init.c:47:6: warning: no previous prototype for 'setup_zero_pages' [-Wmissing-prototypes]
      47 | void setup_zero_pages(void)
         |      ^~~~~~~~~~~~~~~~
   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:182:24: warning: variable 'new' set but not used [-Wunused-but-set-variable]
     182 |                 pmd_t *new;
         |                        ^~~
--
>> arch/loongarch/pci/acpi.c:91:27: warning: no previous prototype for 'arch_pci_ecam_create' [-Wmissing-prototypes]
      91 | struct pci_config_window *arch_pci_ecam_create(struct device *dev,
         |                           ^~~~~~~~~~~~~~~~~~~~
   arch/loongarch/pci/acpi.c: In function 'pci_acpi_setup_ecam_mapping':
   arch/loongarch/pci/acpi.c:166:29: error: 'loongson_pci_ecam_ops' undeclared (first use in this function)
     166 |                 ecam_ops = &loongson_pci_ecam_ops;
         |                             ^~~~~~~~~~~~~~~~~~~~~
   arch/loongarch/pci/acpi.c:166:29: note: each undeclared identifier is reported only once for each function it appears in

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for PCI_LOONGSON
   Depends on [n]: PCI [=y] && (MACH_LOONGSON64 [=y] || COMPILE_TEST [=y]) && (OF [=y] || ACPI [=y]) && PCI_QUIRKS [=n]
   Selected by [y]:
   - LOONGARCH [=y]


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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