linux-kernel - [PATCH 4.6 014/121] MIPS: Reserve nosave data for hibernation

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Message-Id: <20160605214418.141412238@linuxfoundation.org>
Date:	Sun,  5 Jun 2016 14:42:46 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Huacai Chen <chenhc@...ote.com>,
	Aurelien Jarno <aurelien@...el32.net>,
	"Steven J . Hill" <sjhill@...litydiluted.com>,
	Fuxin Zhang <zhangfx@...ote.com>,
	Zhangjin Wu <wuzhangjin@...il.com>, linux-mips@...ux-mips.org,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: [PATCH 4.6 014/121] MIPS: Reserve nosave data for hibernation

4.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Huacai Chen <chenhc@...ote.com>

commit a95d069204e178f18476f5499abab0d0d9cbc32c upstream.

After commit 92923ca3aacef63c92d ("mm: meminit: only set page reserved
in the memblock region"), the MIPS hibernation is broken. Because pages
in nosave data section should be "reserved", but currently they aren't
set to "reserved" at initialization. This patch makes hibernation work
again.

Signed-off-by: Huacai Chen <chenhc@...ote.com>
Cc: Aurelien Jarno <aurelien@...el32.net>
Cc: Steven J . Hill <sjhill@...litydiluted.com>
Cc: Fuxin Zhang <zhangfx@...ote.com>
Cc: Zhangjin Wu <wuzhangjin@...il.com>
Cc: linux-mips@...ux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12888/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/mips/kernel/setup.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -706,6 +706,9 @@ static void __init arch_mem_init(char **
 	for_each_memblock(reserved, reg)
 		if (reg->size != 0)
 			reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
+
+	reserve_bootmem_region(__pa_symbol(&__nosave_begin),
+			__pa_symbol(&__nosave_end)); /* Reserve for hibernation */
 }

 static void __init resource_init(void)