Subject: linux-next: build failure after merge of the akpm tree

From: Stephen Rothwell <[email-masked]>
Date: Thu, 4 Jun 2020 16:44:42 +1000

Hi all,

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

arch/powerpc/mm/ptdump/ptdump.c: In function 'walk_pagetables':
arch/powerpc/mm/ptdump/ptdump.c:337:25: error: implicit declaration of function 'pgd_is_leaf'; did you mean 'p4d_is_leaf'? [-Werror=implicit-function-declaration]
  337 |   if (pgd_none(*pgd) || pgd_is_leaf(*pgd))
      |                         ^~~~~~~~~~~
      |                         p4d_is_leaf

Caused by commit

   "powerpc: add support for folded p4d page tables"

I applied the following fix up patch.

From: Stephen Rothwell <[email-masked]>
Date: Thu, 4 Jun 2020 16:33:01 +1000
Subject: [PATCH] fixup for powerpc ptdump.c

Signed-off-by: Stephen Rothwell <[email-masked]>
---
 arch/powerpc/mm/ptdump/ptdump.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
index 9b1c89b05622..de6e05ef871c 100644
--- a/arch/powerpc/mm/ptdump/ptdump.c
+++ b/arch/powerpc/mm/ptdump/ptdump.c
@@ -334,12 +334,12 @@ static void walk_pagetables(struct pg_state *st)
 	for (i = pgd_index(addr); i < PTRS_PER_PGD; i++, pgd++, addr += PGDIR_SIZE) {
 		p4d_t *p4d = p4d_offset(pgd, 0);
 
-		if (pgd_none(*pgd) || pgd_is_leaf(*pgd))
+		if (p4d_none(*p4d) || p4d_is_leaf(*p4d))
 			note_page(st, addr, 1, p4d_val(*p4d), PGDIR_SIZE);
 		else if (is_hugepd(__hugepd(p4d_val(*p4d))))
-			walk_hugepd(st, (hugepd_t *)pgd, addr, PGDIR_SHIFT, 1);
+			walk_hugepd(st, (hugepd_t *)p4d, addr, PGDIR_SHIFT, 1);
 		else
-			/* pgd exists */
+			/* p4d exists */
 			walk_pud(st, p4d, addr);
 	}
 }
-- 
2.26.2

-- 
Cheers,
Stephen Rothwell