From 8810d7feee5a0cf88d7854f4ad4930a4fab8dd70 Mon Sep 17 00:00:00 2001 From: Niklas Cassel Date: Thu, 14 Apr 2022 19:30:36 +0200 Subject: [PATCH] riscv: Don't output a bogus mmu-type on a no MMU kernel Currently on a 64-bit kernel built without CONFIG_MMU, /proc/cpuinfo will show the current MMU mode as sv57. While the device tree property "mmu-type" does have a value "riscv,none" to describe a CPU without a MMU, since commit 73c7c8f68e72 ("riscv: Use pgtable_l4_enabled to output mmu_type in cpuinfo"), we no longer rely on device tree to output the MMU mode. (Not even for CONFIG_32BIT.) Therefore, instead of readding code to look at the "mmu-type" device tree property, let's continue with the existing convention to use fixed values for configurations where we don't determine the MMU mode at runtime. Add a new fixed value for !CONFIG_MMU in order to output the correct MMU mode in cpuinfo. Signed-off-by: Niklas Cassel Link: https://lore.kernel.org/r/20220414173037.1381927-1-niklas.cassel@wdc.com Signed-off-by: Palmer Dabbelt --- arch/riscv/kernel/cpu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c index 40c8776aec12..fba9e9f46a8c 100644 --- a/arch/riscv/kernel/cpu.c +++ b/arch/riscv/kernel/cpu.c @@ -139,6 +139,7 @@ static void print_mmu(struct seq_file *f) { char sv_type[16]; +#ifdef CONFIG_MMU #if defined(CONFIG_32BIT) strncpy(sv_type, "sv32", 5); #elif defined(CONFIG_64BIT) @@ -149,6 +150,9 @@ static void print_mmu(struct seq_file *f) else strncpy(sv_type, "sv39", 5); #endif +#else + strncpy(sv_type, "none", 5); +#endif /* CONFIG_MMU */ seq_printf(f, "mmu\t\t: %s\n", sv_type); }