Hi all,

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

In file included from include/linux/mmzone.h:22,
                 from include/linux/gfp.h:6,
                 from include/linux/xarray.h:14,
                 from include/linux/radix-tree.h:19,
                 from include/linux/fs.h:15,
                 from include/linux/compat.h:17,
                 from arch/powerpc/kernel/asm-offsets.c:12:
include/linux/page-flags.h:806:29: error: macro "PAGEFLAG_FALSE" requires 2 arguments, but only 1 given
  806 | PAGEFLAG_FALSE(HasHWPoisoned)
      |                             ^
include/linux/page-flags.h:411: note: macro "PAGEFLAG_FALSE" defined here
  411 | #define PAGEFLAG_FALSE(uname, lname) TESTPAGEFLAG_FALSE(uname, lname) \
      | 
include/linux/page-flags.h:807:32: error: macro "TESTSCFLAG_FALSE" requires 2 arguments, but only 1 given
  807 |  TESTSCFLAG_FALSE(HasHWPoisoned)
      |                                ^
include/linux/page-flags.h:414: note: macro "TESTSCFLAG_FALSE" defined here
  414 | #define TESTSCFLAG_FALSE(uname, lname)     \
      | 
include/linux/page-flags.h:806:1: error: unknown type name 'PAGEFLAG_FALSE'
  806 | PAGEFLAG_FALSE(HasHWPoisoned)
      | ^~~~~~~~~~~~~~
include/linux/page-flags.h:807:18: error: expected ';' before 'static'
  807 |  TESTSCFLAG_FALSE(HasHWPoisoned)
      |                  ^
      |                  ;
......
  815 | static inline bool is_page_hwpoison(struct page *page)
      | ~~~~~~            

Caused by commit

  e95de3e8d811 ("mm: filemap: check if THP has hwpoisoned subpage for PMD page fault")

interacting with commit

  d389a4a81155 ("mm: Add folio flag manipulation functions")

from the folio tree.

I have applied the following merge fix patch for today.

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Thu, 21 Oct 2021 17:32:36 +1100
Subject: [PATCH] fix up for "mm: Add folio flag manipulation functions"

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
 include/linux/page-flags.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 867b4bb3c336..80b33404ad1f 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -803,8 +803,8 @@ PAGEFLAG_FALSE(DoubleMap, double_map)
 PAGEFLAG(HasHWPoisoned, has_hwpoisoned, PF_SECOND)
 	TESTSCFLAG(HasHWPoisoned, has_hwpoisoned, PF_SECOND)
 #else
-PAGEFLAG_FALSE(HasHWPoisoned)
-	TESTSCFLAG_FALSE(HasHWPoisoned)
+PAGEFLAG_FALSE(HasHWPoisoned, hashwpoisoned)
+	TESTSCFLAG_FALSE(HasHWPoisoned, hashwpoisoned)
 #endif
 
 /*
-- 
2.33.0

-- 
Cheers,
Stephen Rothwell