Replaced with this.
Thanks, Arnd & Chao, ;)
On Wed, Nov 02, 2016 at 02:52:15PM +0100, Arnd Bergmann wrote:
> gcc is unsure about the use of last_ofs_in_node, which might happen
> without a prior initialization:
>
> fs/f2fs//git/arm-soc/fs/f2fs/data.c: In function ‘f2fs_map_blocks’:
> fs/f2fs/data.c:799:54: warning: ‘last_ofs_in_node’ may be used uninitialized
> in this function [-Wmaybe-uninitialized]
> if (prealloc && dn.ofs_in_node != last_ofs_in_node + 1) {
>
> As pointed out by Chao Yu, the code is actually correct as 'prealloc'
> is only set if the last_ofs_in_node has been set, the two always
> get updated together.
>
> This initializes last_ofs_in_node to dn.ofs_in_node for each
> new dnode at the start of the 'next_block' loop, which at that
> point is a correct initialization as well. I assume that compilers
> that correctly track the contents of the variables and do not
> warn about the condition also figure out that they can eliminate
> the extra assignment here.
>
> Fixes: 46008c6d4232 ("f2fs: support in batch multi blocks preallocation")
> Signed-off-by: Arnd Bergmann <a...@arndb.de>
> ---
> fs/f2fs/data.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index a59ea8e60040..6f01aaddfce9 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -719,7 +719,7 @@ int f2fs_map_blocks(struct inode *inode, struct
> f2fs_map_blocks *map,
> }
>
> prealloc = 0;
> - ofs_in_node = dn.ofs_in_node;
> + last_ofs_in_node = ofs_in_node = dn.ofs_in_node;
> end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
>
> next_block:
> --
> 2.9.0
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