Re: [akpm-mm:mm-unstable 111/127] include/linux/stackdepot.h:116:26: error: declaration of 'struct seq_file' will not be visible outside of this function

[Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>]

On Wed, 17 May 2023 14:33:32 +0800 kernel test robot <lkp@xxxxxxxxx> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
> head:   3dabb05be4612527104198f754de8c5443f7f765
> commit: e435b85a4aea7a82259105d5d8025655460052e1 [111/127] mm, page_owner: add page_owner_stacks file to print out only stacks and their counte
> config: arm-buildonly-randconfig-r006-20230517

Thanks, I did this:

--- a/include/linux/stackdepot.h~mm-page_owner-add-page_owner_stacks-file-to-print-out-only-stacks-and-their-counte-fix
+++ a/include/linux/stackdepot.h
@@ -25,6 +25,7 @@
 #include <linux/gfp.h>
 
 typedef u32 depot_stack_handle_t;
+struct seq_file;
 
 /*
  * Number of bits in the handle that stack depot doesn't use. Users may store
_