linux-kernel - [PATCH 2/2] sh: initialize max

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Date:   Tue, 14 Feb 2023 16:07:29 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Guenter Roeck <linux@...ck-us.net>,
        "Mike Rapoport (IBM)" <rppt@...nel.org>,
        Rich Felker <dalias@...c.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mm@...ck.org, linux-sh@...r.kernel.org
Subject: [PATCH 2/2] sh: initialize max_mapnr

From: "Mike Rapoport (IBM)" <rppt@...nel.org>

sh never initializes max_mapnr which is used by the generic
implementation of pfn_valid().

Initialize max_mapnr with set_max_mapnr() in sh::paging_init().

Reported-by: Guenter Roeck <linux@...ck-us.net>
Fixes: e5080a967785 ("mm, arch: add generic implementation of pfn_valid() for FLATMEM")
Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
---
 arch/sh/mm/init.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 506784702430..bf1b54055316 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -301,6 +301,7 @@ void __init paging_init(void)
 	 */
 	max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
 	min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
+	set_max_mapnr(max_low_pfn - min_low_pfn);
 
 	nodes_clear(node_online_map);
 
-- 
2.35.1