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

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BugLink: https://bugs.launchpad.net/bugs/2085849

[ Upstream commit 5f771088a2b5edd6f2c5c9f34484ca18dc389f3e ]

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: 3b6564427aea ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Alexandre Ghiti
2024-08-27 08:52:30 +02:00
committed by Mehmet Basaran
parent afc592d1a5
commit 5ad527bff7
1 changed files with 1 additions and 1 deletions
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arch/riscv/mm/init.c
+1 -1
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@@ -237,7 +237,7 @@ 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);