linux-kernel - linux-next: build failure after merge of the mm tree

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Message-ID: <20230518095929.509e34c0@canb.auug.org.au>
Date:   Thu, 18 May 2023 09:59:29 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Oscar Salvador <osalvador@...e.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the mm tree

Hi all,

After merging the mm tree, today's linux-next build (powerpc
ppc64_defconfig) failed like this:

In file included from include/linux/page_ext.h:7,
                 from include/linux/mm.h:22,
                 from security/min_addr.c:3:
include/linux/stackdepot.h:116:26: warning: 'struct seq_file' declared inside parameter list will not be visible outside of this definition or declaration
  116 | void *stack_start(struct seq_file *m, loff_t *ppos);
      |                          ^~~~~~~~
include/linux/stackdepot.h:117:25: warning: 'struct seq_file' declared inside parameter list will not be visible outside of this definition or declaration
  117 | void *stack_next(struct seq_file *m, void *v, loff_t *ppos);
      |                         ^~~~~~~~
include/linux/stackdepot.h:118:24: warning: 'struct seq_file' declared inside parameter list will not be visible outside of this definition or declaration
  118 | int stack_print(struct seq_file *m, void *v);
      |                        ^~~~~~~~

And many, many more ...

Caused by commit

  e435b85a4aea ("mm, page_owner: add page_owner_stacks file to print out only stacks and their counte")

I have applied the following patch for today:

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Thu, 18 May 2023 09:39:46 +1000
Subject: [PATCH] fix for "mm, page_owner: add page_owner_stacks file to print
 out only stacks and their counte"

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 include/linux/stackdepot.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h
index 7e9d0e9ec66b..8bbd1639ae85 100644
--- a/include/linux/stackdepot.h
+++ b/include/linux/stackdepot.h
@@ -113,6 +113,7 @@ depot_stack_handle_t stack_depot_save(unsigned long *entries,
 				      unsigned int nr_entries, gfp_t gfp_flags);
 
 #ifdef CONFIG_PAGE_OWNER
+struct seq_file;
 void *stack_start(struct seq_file *m, loff_t *ppos);
 void *stack_next(struct seq_file *m, void *v, loff_t *ppos);
 int stack_print(struct seq_file *m, void *v);
-- 
2.39.2

-- 
Cheers,
Stephen Rothwell

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