Hi Darrick, I love your patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v4.17-rc6] [cannot apply to dm/for-next] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Ross-Zwisler/Fix-DM-DAX-handling/20180526-212746 config: i386-randconfig-x014-201820 (attached as .config) compiler: gcc-7 (Debian 7.3.0-16) 7.3.0 reproduce: # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): >> drivers//dax/super.c:85:5: error: redefinition of 'bdev_dax_supported' int bdev_dax_supported(struct block_device *bdev, int blocksize) ^~~~~~~~~~~~~~~~~~ In file included from drivers//dax/super.c:23:0: include/linux/dax.h:82:19: note: previous definition of 'bdev_dax_supported' was here static inline int bdev_dax_supported(struct block_device *bdev, ^~~~~~~~~~~~~~~~~~ vim +/bdev_dax_supported +85 drivers//dax/super.c 74 75 /** 76 * bdev_dax_supported() - Check if the device supports dax for filesystem 77 * @bdev: block device to check 78 * @blocksize: The block size of the device 79 * 80 * This is a library function for filesystems to check if the block device 81 * can be mounted with dax option. 82 * 83 * Return: negative errno if unsupported, 0 if supported. 84 */ > 85 int bdev_dax_supported(struct block_device *bdev, int blocksize) 86 { 87 struct dax_device *dax_dev; 88 pgoff_t pgoff; 89 int err, id; 90 void *kaddr; 91 pfn_t pfn; 92 long len; 93 char buf[BDEVNAME_SIZE]; 94 95 if (blocksize != PAGE_SIZE) { 96 pr_debug("%s: error: unsupported blocksize for dax\n", 97 bdevname(bdev, buf)); 98 return -EINVAL; 99 } 100 101 err = bdev_dax_pgoff(bdev, 0, PAGE_SIZE, &pgoff); 102 if (err) { 103 pr_debug("%s: error: unaligned partition for dax\n", 104 bdevname(bdev, buf)); 105 return err; 106 } 107 108 dax_dev = dax_get_by_host(bdev->bd_disk->disk_name); 109 if (!dax_dev) { 110 pr_debug("%s: error: device does not support dax\n", 111 bdevname(bdev, buf)); 112 return -EOPNOTSUPP; 113 } 114 115 id = dax_read_lock(); 116 len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn); 117 dax_read_unlock(id); 118 119 put_dax(dax_dev); 120 121 if (len < 1) { 122 pr_debug("%s: error: dax access failed (%ld)\n", 123 bdevname(bdev, buf), len); 124 return len < 0 ? len : -EIO; 125 } 126 127 if (IS_ENABLED(CONFIG_FS_DAX_LIMITED) && pfn_t_special(pfn)) { 128 /* 129 * An arch that has enabled the pmem api should also 130 * have its drivers support pfn_t_devmap() 131 * 132 * This is a developer warning and should not trigger in 133 * production. dax_flush() will crash since it depends 134 * on being able to do (page_address(pfn_to_page())). 135 */ 136 WARN_ON(IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API)); 137 } else if (pfn_t_devmap(pfn)) { 138 /* pass */; 139 } else { 140 pr_debug("%s: error: dax support not enabled\n", 141 bdevname(bdev, buf)); 142 return -EOPNOTSUPP; 143 } 144 145 return 0; 146 } 147 EXPORT_SYMBOL_GPL(bdev_dax_supported); 148 #endif 149 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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