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From 91e89cad429a9d65330a41a5cb7039671f1d6204 Mon Sep 17 00:00:00 2001
From: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Date: Wed, 19 Dec 2018 19:16:16 +0300
Subject: [PATCH] ARC: adjust memblock_reserve of kernel memory
In setup_arch_memory we reserve the memory area wherein the kernel
is located. Current implementation may reserve more memory than
it actually required in case of CONFIG_LINUX_LINK_BASE is not
equal to CONFIG_LINUX_RAM_BASE. This happens because we calculate
start of the reserved region relatively to the CONFIG_LINUX_RAM_BASE
and end of the region relatively to the CONFIG_LINUX_RAM_BASE.
For example in case of HSDK board we wasted 256MiB of physical memory:
------------------->8------------------------------
Memory: 770416K/1048576K available (5496K kernel code,
240K rwdata, 1064K rodata, 2200K init, 275K bss,
278160K reserved, 0K cma-reserved)
------------------->8------------------------------
Fix that.
Fixes: 9ed68785f7f ("ARC: mm: Decouple RAM base address from kernel link addr")
Cc: stable@vger.kernel.org #4.14+
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
arch/arc/mm/init.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
index ba14506..f890b2f 100644
--- a/arch/arc/mm/init.c
+++ b/arch/arc/mm/init.c
@@ -138,7 +138,8 @@ void __init setup_arch_memory(void)
*/
memblock_add_node(low_mem_start, low_mem_sz, 0);
- memblock_reserve(low_mem_start, __pa(_end) - low_mem_start);
+ memblock_reserve(CONFIG_LINUX_LINK_BASE,
+ __pa(_end) - CONFIG_LINUX_LINK_BASE);
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start)
--
1.8.3.1
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