Commit a3010a04 authored Dec 19, 2018 by Eugeniy Paltsev Committed by Vineet Gupta Jan 17, 2019

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: 9ed68785 ("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>

parent 76e60867

arch/arc/mm/init.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -119,7 +119,8 @@ 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 (phys_initrd_size) {

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