On Fri, Nov 16, 2018 at 03:54:24PM +0800, Qu Wenruo wrote:
> The only location is the following code:
>
> int level = path->lowest_level + 1;
> BUG_ON(path->lowest_level + 1 >= BTRFS_MAX_LEVEL);
> while(level < BTRFS_MAX_LEVEL) {
> slot = path->slots[level] + 1;
> ...
> }
> path->slots[level] = slot;
>
> Again, it's the stupid compiler needs some hint for the fact that
> we will always enter the while loop for at least once, thus @slot should
> always be initialized.
Harsh words for the compiler, and I say not deserved. The same code
pasted to kernel a built with the same version does not report the
warning, so it's apparently a missing annotation of BUG_ON in
btrfs-progs that does not give the right hint.
