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btrfs: avoid uninitialized variable warning

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With CONFIG_SMP and CONFIG_PREEMPT both disabled, gcc decides
to partially inline the get_state_failrec() function but cannot
figure out that means the failrec pointer is always valid
if the function returns success, which causes a harmless
warning:

fs/btrfs/extent_io.c: In function 'clean_io_failure':
fs/btrfs/extent_io.c:2131:4: error: 'failrec' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This marks get_state_failrec() and set_state_failrec() both
as 'noinline', which avoids the warning in all cases for me,
and seems less ugly than adding a fake initialization.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 47dc196ae7 ("btrfs: use proper type for failrec in extent_state")
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Arnd Bergmann 2016-02-22 22:53:20 +01:00 committed by David Sterba
parent 5598e9005a
commit f827ba9a64
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/extent_io.c
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@ -1842,7 +1842,7 @@ u64 count_range_bits(struct extent_io_tree *tree,
* set the private field for a given byte offset in the tree. If there isn't
* an extent_state there already, this does nothing.
*/
static int set_state_failrec(struct extent_io_tree *tree, u64 start,
static noinline int set_state_failrec(struct extent_io_tree *tree, u64 start,
struct io_failure_record *failrec)
{
struct rb_node *node;
@ -1870,7 +1870,7 @@ static int set_state_failrec(struct extent_io_tree *tree, u64 start,
return ret;
}
static int get_state_failrec(struct extent_io_tree *tree, u64 start,
static noinline int get_state_failrec(struct extent_io_tree *tree, u64 start,
struct io_failure_record **failrec)
{
struct rb_node *node;