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SubjectRe: [PATCH] vfs: remove unused argument in iterate_bdevs
Hi Rakesh,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.15-rc7 next-20180112]
[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/Rakesh-Pandit/vfs-remove-unused-argument-in-iterate_bdevs/20180114-215207
config: i386-randconfig-x071-201802 (attached as .config)
compiler: gcc-7 (Debian 7.2.0-12) 7.2.1 20171025
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All errors (new ones prefixed by >>):

fs/sync.c: In function 'sys_sync':
>> fs/sync.c:116:16: error: passing argument 1 of 'iterate_bdevs' from incompatible pointer type [-Werror=incompatible-pointer-types]
iterate_bdevs(fdatawrite_one_bdev);
^~~~~~~~~~~~~~~~~~~
In file included from fs/sync.c:8:0:
include/linux/fs.h:2475:20: note: expected 'void (*)(struct block_device *, void *)' but argument is of type 'void (*)(struct block_device *)'
static inline void iterate_bdevs(void (*f)(struct block_device *, void *))
^~~~~~~~~~~~~
fs/sync.c:117:16: error: passing argument 1 of 'iterate_bdevs' from incompatible pointer type [-Werror=incompatible-pointer-types]
iterate_bdevs(fdatawait_one_bdev);
^~~~~~~~~~~~~~~~~~
In file included from fs/sync.c:8:0:
include/linux/fs.h:2475:20: note: expected 'void (*)(struct block_device *, void *)' but argument is of type 'void (*)(struct block_device *)'
static inline void iterate_bdevs(void (*f)(struct block_device *, void *))
^~~~~~~~~~~~~
fs/sync.c: In function 'do_sync_work':
fs/sync.c:133:16: error: passing argument 1 of 'iterate_bdevs' from incompatible pointer type [-Werror=incompatible-pointer-types]
iterate_bdevs(fdatawrite_one_bdev);
^~~~~~~~~~~~~~~~~~~
In file included from fs/sync.c:8:0:
include/linux/fs.h:2475:20: note: expected 'void (*)(struct block_device *, void *)' but argument is of type 'void (*)(struct block_device *)'
static inline void iterate_bdevs(void (*f)(struct block_device *, void *))
^~~~~~~~~~~~~
fs/sync.c:136:16: error: passing argument 1 of 'iterate_bdevs' from incompatible pointer type [-Werror=incompatible-pointer-types]
iterate_bdevs(fdatawrite_one_bdev);
^~~~~~~~~~~~~~~~~~~
In file included from fs/sync.c:8:0:
include/linux/fs.h:2475:20: note: expected 'void (*)(struct block_device *, void *)' but argument is of type 'void (*)(struct block_device *)'
static inline void iterate_bdevs(void (*f)(struct block_device *, void *))
^~~~~~~~~~~~~
cc1: some warnings being treated as errors

vim +/iterate_bdevs +116 fs/sync.c

97
98 /*
99 * Sync everything. We start by waking flusher threads so that most of
100 * writeback runs on all devices in parallel. Then we sync all inodes reliably
101 * which effectively also waits for all flusher threads to finish doing
102 * writeback. At this point all data is on disk so metadata should be stable
103 * and we tell filesystems to sync their metadata via ->sync_fs() calls.
104 * Finally, we writeout all block devices because some filesystems (e.g. ext2)
105 * just write metadata (such as inodes or bitmaps) to block device page cache
106 * and do not sync it on their own in ->sync_fs().
107 */
108 SYSCALL_DEFINE0(sync)
109 {
110 int nowait = 0, wait = 1;
111
112 wakeup_flusher_threads(WB_REASON_SYNC);
113 iterate_supers(sync_inodes_one_sb, NULL);
114 iterate_supers(sync_fs_one_sb, &nowait);
115 iterate_supers(sync_fs_one_sb, &wait);
> 116 iterate_bdevs(fdatawrite_one_bdev);
117 iterate_bdevs(fdatawait_one_bdev);
118 if (unlikely(laptop_mode))
119 laptop_sync_completion();
120 return 0;
121 }
122

---
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