From:   Mike Rapoport <rppt@kernel.org>
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Arnd Bergmann <arnd@arndb.de>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Greg Ungerer <gerg@linux-m68k.org>,
        Guenter Roeck <linux@roeck-us.net>,
        "Mike Rapoport (IBM)" <rppt@kernel.org>,
        Rich Felker <dalias@libc.org>,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
        linux-mm@kvack.org, linux-sh@vger.kernel.org
Subject: [PATCH 2/2] sh: initialize max_mapnr
Date:   Tue, 14 Feb 2023 16:07:29 +0200
Message-Id: <20230214140729.1649961-3-rppt@kernel.org>
In-Reply-To: <20230214140729.1649961-1-rppt@kernel.org>
References: <20230214140729.1649961-1-rppt@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: "Mike Rapoport (IBM)" <rppt@kernel.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@roeck-us.net>
Fixes: e5080a967785 ("mm, arch: add generic implementation of pfn_valid() for FLATMEM")
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.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