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riscv: Do not restrict memory size because of linear mapping on nommu

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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@linux-m68k.org>
Closes: https://lore.kernel.org/linux-riscv/CAMuHMdW0bnJt5GMRtOZGkTiM7GK4UaLJCDMF_Ouq++fnDKi3_A@mail.gmail.com/
Fixes: 3b6564427a ("riscv: Fix linear mapping checks for non-contiguous memory regions")
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20240827065230.145021-1-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Alexandre Ghiti 2024-08-27 08:52:30 +02:00 • committed by Palmer Dabbelt
parent 5ba7a75a53
commit 5f771088a2
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1 changed files with 1 additions and 1 deletions
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2
arch/riscv/mm/init.c
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@ -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);