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Commit eeb3fee8 authored by Russell King's avatar Russell King
Browse files

ARM: add helpful message when truncating physical memory 



Add a nmessage to suggest that HIGHMEM is enabled when physical memory
is truncated due to lack of virtual address space to map it in the low
memory mapping.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent b4d103d1

arch/arm/mm/mmu.c

+6 −0
Original line number Diff line number Diff line
@@ -1072,6 +1072,7 @@ void __init sanity_check_meminfo(void) 
	int highmem = 0;

	phys_addr_t vmalloc_limit = __pa(vmalloc_min - 1) + 1;

	struct memblock_region *reg;

	bool should_use_highmem = false;



	for_each_memblock(memory, reg) {

		phys_addr_t block_start = reg->base;
@@ -1090,6 +1091,7 @@ void __init sanity_check_meminfo(void) 
				pr_notice("Ignoring RAM at %pa-%pa (!CONFIG_HIGHMEM)\n",

					  &block_start, &block_end);

				memblock_remove(reg->base, reg->size);

				should_use_highmem = true;

				continue;

			}
@@ -1100,6 +1102,7 @@ void __init sanity_check_meminfo(void) 
					  &block_start, &block_end, &vmalloc_limit);

				memblock_remove(vmalloc_limit, overlap_size);

				block_end = vmalloc_limit;

				should_use_highmem = true;

			}

		}
@@ -1134,6 +1137,9 @@ void __init sanity_check_meminfo(void) 
		}

	}



	if (should_use_highmem)

		pr_notice("Consider using a HIGHMEM enabled kernel.\n");



	high_memory = __va(arm_lowmem_limit - 1) + 1;



	/*