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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org The Maximum Physical Memory 2GiB option for 64bit systems is currently broken because kernel hangs at boot-time when this option is enabled and the underlying system has more than 2GiB memory. This issue can be easily reproduced on SiFive Unleashed board where we have 8GiB of memory. This patch fixes above issue by removing unusable memory region in setup_bootmem(). Signed-off-by: Anup Patel Reviewed-by: Christoph Hellwig --- Changes since v2: - Drop brackets in if() condition added by this patch Changes since v1: - Use memblock_remove() instead of memblock_reserve() --- arch/riscv/mm/init.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 5fd8c922e1c2..bc7b77e34d09 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -121,6 +121,14 @@ void __init setup_bootmem(void) */ memblock_reserve(reg->base, vmlinux_end - reg->base); mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET); + + /* + * Remove memblock from the end of usable area to the + * end of region + */ + if (reg->base + mem_size < end) + memblock_remove(reg->base + mem_size, + end - reg->base - mem_size); } } BUG_ON(mem_size == 0); -- 2.17.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv