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Commit 9f9d04a0 authored by Vijayanand Jitta's avatar Vijayanand Jitta Committed by Gerrit - the friendly Code Review server
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arm64: Honor limits set by boot parameter 



Consider the memory limit enforced by boot parameter and
restrict adding beyond this boundary during a memory hotplug.

Change-Id: Ibd13e47ee13004381a1ddff649150fae13429c87
Signed-off-by: default avatarVijayanand Jitta <vjitta@codeaurora.org>
parent 07c19948

arch/arm64/mm/init.c

+16 −3
Original line number Diff line number Diff line
@@ -333,7 +333,16 @@ static void __init update_memory_limit(void) 
	phys_addr_t min_ddr_sz = 0, offline_sz = 0;

	int t_len = (2 * dt_root_size_cells) * sizeof(__be32);



	if (memory_limit == PHYS_ADDR_MAX)

		ram_sz = memblock_phys_mem_size();

	else if (IS_ALIGNED(memory_limit, MIN_MEMORY_BLOCK_SIZE))

		ram_sz = memory_limit;

	else {

		WARN(1, "mem-offline is not supported for DDR size %lld\n",

				memory_limit);

		return;

	}



	node = of_get_flat_dt_subnode_by_name(dt_root, "mem-offline");

	if (node == -FDT_ERR_NOTFOUND) {

		pr_err("mem-offine node not found in FDT\n");
@@ -486,12 +495,16 @@ void __init arm64_memblock_init(void) 
		memblock_remove(0, memstart_addr);

	}



	update_memory_limit();

	/*

	 * Save bootloader imposed memory limit before we overwirte

	 * memblock.

	 */

	if (memory_limit == PHYS_ADDR_MAX)

		bootloader_memory_limit = memblock_end_of_DRAM();

	else

		bootloader_memory_limit = memblock_max_addr(memory_limit);



	update_memory_limit();



	/*

	 * Apply the memory limit if it was set. Since the kernel may be loaded