linux-kernel - arch/riscv/mm/init.c:782:83: warning: suggest braces around empty body in an 'if' statement

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Message-ID: <202205230554.bQhtkCTA-lkp@intel.com>
Date:   Mon, 23 May 2022 05:19:33 +0800
From:   kernel test robot <lkp@...el.com>
To:     Qinglin Pan <panqinglin2020@...as.ac.cn>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Palmer Dabbelt <palmer@...osinc.com>
Subject: arch/riscv/mm/init.c:782:83: warning: suggest braces around empty
 body in an 'if' statement

Hi Qinglin,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4b0986a3613c92f4ec1bdc7f60ec66fea135991f
commit: 677b9eb8810edc6c616a699018a83e24ed0cccab riscv: mm: Prepare pt_ops helper functions for sv57
date:   3 months ago
config: riscv-randconfig-r042-20220522 (https://download.01.org/0day-ci/archive/20220523/202205230554.bQhtkCTA-lkp@intel.com/config)
compiler: riscv32-linux-gcc (GCC) 11.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=677b9eb8810edc6c616a699018a83e24ed0cccab
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 677b9eb8810edc6c616a699018a83e24ed0cccab
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/mm/

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/riscv/mm/init.c: In function 'create_fdt_early_page_table':
>> arch/riscv/mm/init.c:782:83: warning: suggest braces around empty body in an 'if' statement [-Wempty-body]
     782 |                                    (uintptr_t)early_dtb_pud, P4D_SIZE, PAGE_TABLE);
         |                                                                                   ^
   arch/riscv/mm/init.c:786:83: warning: suggest braces around empty body in an 'if' statement [-Wempty-body]
     786 |                                    (uintptr_t)early_dtb_pmd, PUD_SIZE, PAGE_TABLE);
         |                                                                                   ^
   arch/riscv/mm/init.c: At top level:
   arch/riscv/mm/init.c:813:13: warning: no previous prototype for 'pt_ops_set_early' [-Wmissing-prototypes]
     813 | void __init pt_ops_set_early(void)
         |             ^~~~~~~~~~~~~~~~
   arch/riscv/mm/init.c:835:13: warning: no previous prototype for 'pt_ops_set_fixmap' [-Wmissing-prototypes]
     835 | void __init pt_ops_set_fixmap(void)
         |             ^~~~~~~~~~~~~~~~~
   arch/riscv/mm/init.c:853:13: warning: no previous prototype for 'pt_ops_set_late' [-Wmissing-prototypes]
     853 | void __init pt_ops_set_late(void)
         |             ^~~~~~~~~~~~~~~


vim +/if +782 arch/riscv/mm/init.c

   764	
   765	/*
   766	 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel,
   767	 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR
   768	 * entry.
   769	 */
   770	static void __init create_fdt_early_page_table(pgd_t *pgdir, uintptr_t dtb_pa)
   771	{
   772	#ifndef CONFIG_BUILTIN_DTB
   773		uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1);
   774	
   775		create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
   776				   IS_ENABLED(CONFIG_64BIT) ? early_dtb_pgd_next : pa,
   777				   PGDIR_SIZE,
   778				   IS_ENABLED(CONFIG_64BIT) ? PAGE_TABLE : PAGE_KERNEL);
   779	
   780		if (pgtable_l5_enabled)
   781			create_p4d_mapping(early_dtb_p4d, DTB_EARLY_BASE_VA,
 > 782					   (uintptr_t)early_dtb_pud, P4D_SIZE, PAGE_TABLE);
   783	
   784		if (pgtable_l4_enabled)
   785			create_pud_mapping(early_dtb_pud, DTB_EARLY_BASE_VA,
   786					   (uintptr_t)early_dtb_pmd, PUD_SIZE, PAGE_TABLE);
   787	
   788		if (IS_ENABLED(CONFIG_64BIT)) {
   789			create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
   790					   pa, PMD_SIZE, PAGE_KERNEL);
   791			create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
   792					   pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
   793		}
   794	
   795		dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
   796	#else
   797		/*
   798		 * For 64-bit kernel, __va can't be used since it would return a linear
   799		 * mapping address whereas dtb_early_va will be used before
   800		 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the
   801		 * kernel is mapped in the linear mapping, that makes no difference.
   802		 */
   803		dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
   804	#endif
   805	
   806		dtb_early_pa = dtb_pa;
   807	}
   808	

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