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| author |   Geert Uytterhoeven <geert@linux-m68k.org> | 2013-11-14 14:32:18 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-15 09:32:23 +0900 |
| commit | a99b7069aab8fc3fb4f26d15795dc280b52e38b1 (patch) | |
| tree | aa9d2dde6d72e7c5dc1e8ba58cc7da9561f83b55 /fs/hfsplus | |
| parent | kfifo API type safety (diff) | |
| download | linux-dev-a99b7069aab8fc3fb4f26d15795dc280b52e38b1.tar.xz linux-dev-a99b7069aab8fc3fb4f26d15795dc280b52e38b1.zip | |
hfsplus: Fix undefined __divdi3 in hfsplus_init_header_node()
ERROR: "__divdi3" [fs/hfsplus/hfsplus.ko] undefined!
Introduced by commit 099e9245e04d ("hfsplus: implement attributes file's
header node initialization code").
i_size_read() returns loff_t, which is long long, i.e. 64-bit. node_size
is size_t, which is either 32-bit or 64-bit. Hence
"i_size_read(attr_file) / node_size" is a 64-by-32 or 64-by-64 division,
causing (some versions of) gcc to emit a call to __divdi3().
Fortunately node_size is actually 16-bit, as the sole caller of
hfsplus_init_header_node() passes a u16. Hence change its type from
size_t to u16, and use do_div() to perform a 64-by-32 division.
Not seen in m68k/allmodconfig in -next, so it really depends on the
verion of gcc.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Vyacheslav Dubeyko <slava@dubeyko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/hfsplus')
| -rw-r--r-- | fs/hfsplus/xattr.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/hfsplus/xattr.c b/fs/hfsplus/xattr.c index efc85b1377cc..3c6136f98c73 100644 --- a/fs/hfsplus/xattr.c +++ b/fs/hfsplus/xattr.c @@ -129,7 +129,7 @@ static int can_set_xattr(struct inode *inode, const char *name, static void hfsplus_init_header_node(struct inode *attr_file, u32 clump_size, - char *buf, size_t node_size) + char *buf, u16 node_size) { struct hfs_bnode_desc *desc; struct hfs_btree_header_rec *head; @@ -139,8 +139,9 @@ static void hfsplus_init_header_node(struct inode *attr_file, char *bmp; u32 used_nodes; u32 used_bmp_bytes; + loff_t tmp; - hfs_dbg(ATTR_MOD, "init_hdr_attr_file: clump %u, node_size %zu\n", + hfs_dbg(ATTR_MOD, "init_hdr_attr_file: clump %u, node_size %u\n", clump_size, node_size); /* The end of the node contains list of record offsets */ @@ -154,7 +155,9 @@ static void hfsplus_init_header_node(struct inode *attr_file, head = (struct hfs_btree_header_rec *)(buf + offset); head->node_size = cpu_to_be16(node_size); - head->node_count = cpu_to_be32(i_size_read(attr_file) / node_size); + tmp = i_size_read(attr_file); + do_div(tmp, node_size); + head->node_count = cpu_to_be32(tmp); head->free_nodes = cpu_to_be32(be32_to_cpu(head->node_count) - 1); head->clump_size = cpu_to_be32(clump_size); head->attributes |= cpu_to_be32(HFS_TREE_BIGKEYS | HFS_TREE_VARIDXKEYS); |