[linux-next:master] BUILD REGRESSION 8cb8311e95e3bb58bd84d6350365f14a718faa6d

[Dan Carpenter]

On Thu, May 26, 2022 at 02:16:34AM +0100, Matthew Wilcox wrote:
> Bizarre this started showing up now.  The recent patch was:
> 
> -       info->alloced += compound_nr(page);
> -       inode->i_blocks += BLOCKS_PER_PAGE << compound_order(page);
> +       info->alloced += folio_nr_pages(folio);
> +       inode->i_blocks += BLOCKS_PER_PAGE << folio_order(folio);
> 
> so it could tell that compound_order() was small, but folio_order()
> might be large?

The old code also generates a warning on my test system.  Smatch thinks
both compound_order() and folio_order() are 0-255.  I guess because of
the "unsigned char compound_order;" in the struct page.

regards,
dan carpenter