[PATCH -next] arm64/mm/dump: fix a compilation error

[Qian Cai <cai@lca.pw>]

The linux-next commit "x86: mm: avoid allocating struct mm_struct on the
stack" [1] introduced a compilation error with "arm64: mm: convert
mm/dump.c to use walk_page_range()" [2]. Fixed it by using the new API.

arch/arm64/mm/dump.c:326:38: error: too few arguments to function call,
expected 3, have 2
        ptdump_walk_pgd(&st.ptdump, info->mm);
        ~~~~~~~~~~~~~~~                     ^
./include/linux/ptdump.h:20:1: note: 'ptdump_walk_pgd' declared here
void ptdump_walk_pgd(struct ptdump_state *st, struct mm_struct *mm,
pgd_t *pgd);
^
arch/arm64/mm/dump.c:364:38: error: too few arguments to function call,
expected 3, have 2
        ptdump_walk_pgd(&st.ptdump, &init_mm);
        ~~~~~~~~~~~~~~~                     ^
./include/linux/ptdump.h:20:1: note: 'ptdump_walk_pgd' declared here
void ptdump_walk_pgd(struct ptdump_state *st, struct mm_struct *mm,
pgd_t *pgd);
^
2 errors generated.

[1] http://lkml.kernel.org/r/20200108145710.34314-1-steven.price@arm.com
[2] http://lkml.kernel.org/r/20191218162402.45610-22-steven.price@arm.com

Signed-off-by: Qian Cai <cai@lca.pw>
---
 arch/arm64/mm/dump.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c
index ef4b3ca1e058..860c00ec8bd3 100644
--- a/arch/arm64/mm/dump.c
+++ b/arch/arm64/mm/dump.c
@@ -323,7 +323,7 @@ void ptdump_walk(struct seq_file *s, struct ptdump_info *info)
 		}
 	};
 
-	ptdump_walk_pgd(&st.ptdump, info->mm);
+	ptdump_walk_pgd(&st.ptdump, info->mm, NULL);
 }
 
 static void ptdump_initialize(void)
@@ -361,7 +361,7 @@ void ptdump_check_wx(void)
 		}
 	};
 
-	ptdump_walk_pgd(&st.ptdump, &init_mm);
+	ptdump_walk_pgd(&st.ptdump, &init_mm, NULL);
 
 	if (st.wx_pages || st.uxn_pages)
 		pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found, %lu non-UXN pages found\n",
-- 
2.21.0 (Apple Git-122.2)