From: Marcin Nowakowski <marcin.nowakowski@xxxxxxxxxx> [ Upstream commit 73fbc1eba7ffa3bf0ad12486232a8a1edb4e4411 ] When a memory offset is specified through the commandline, add the memory in range PHYS_OFFSET:Y as reserved memory area. Otherwise the bootmem allocator is initialised with low page equal to min_low_pfn = PHYS_OFFSET, and in free_all_bootmem will process pages starting from min_low_pfn instead of PFN(Y). Signed-off-by: Marcin Nowakowski <marcin.nowakowski@xxxxxxxxxx> Cc: linux-mips@xxxxxxxxxxxxxx Patchwork: https://patchwork.linux-mips.org/patch/14613/ Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> --- arch/mips/kernel/setup.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c index f66e5ce505b2..38697f25d168 100644 --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c @@ -589,6 +589,10 @@ static int __init early_parse_mem(char *p) start = memparse(p + 1, &p); add_memory_region(start, size, BOOT_MEM_RAM); + + if (start && start > PHYS_OFFSET) + add_memory_region(PHYS_OFFSET, start - PHYS_OFFSET, + BOOT_MEM_RESERVED); return 0; } early_param("mem", early_parse_mem); -- 2.11.0