[PATCH -fixes] riscv: Do not restrict memory size because of linear mapping on nommu

[Alexandre Ghiti]

It makes no sense to restrict physical memory size because of linear
mapping size constraints when there is no linear mapping, so only do
that when mmu is enabled.

Reported-by: Geert Uytterhoeven <geert at linux-m68k.org>
Closes: https://lore.kernel.org/linux-riscv/CAMuHMdW0bnJt5GMRtOZGkTiM7GK4UaLJCDMF_Ouq++fnDKi3_A@mail.gmail.com/
Fixes: 3b6564427aea ("riscv: Fix linear mapping checks for non-contiguous memory regions")
Signed-off-by: Alexandre Ghiti <alexghiti at rivosinc.com>
---
 arch/riscv/mm/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index eb0649a61b4c..1785782c2e55 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -252,7 +252,7 @@ static void __init setup_bootmem(void)
 	 * The size of the linear page mapping may restrict the amount of
 	 * usable RAM.
 	 */
-	if (IS_ENABLED(CONFIG_64BIT)) {
+	if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_MMU)) {
 		max_mapped_addr = __pa(PAGE_OFFSET) + KERN_VIRT_SIZE;
 		memblock_cap_memory_range(phys_ram_base,
 					  max_mapped_addr - phys_ram_base);
-- 
2.39.2