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| author |   Niklas Cassel <niklas.cassel@wdc.com> | 2022-04-14 19:30:36 +0200 |
|---|---|---|
| committer |   Palmer Dabbelt <palmer@rivosinc.com> | 2022-05-21 12:20:04 -0700 |
| commit | 8810d7feee5a0cf88d7854f4ad4930a4fab8dd70 (patch) | |
| tree | 0703faa8a2bd790638b004f888aa1168209e4b8d /arch/riscv | |
| parent | riscv: atomic: Add custom conditional atomic operation implementation (diff) | |
| download | linux-dev-8810d7feee5a0cf88d7854f4ad4930a4fab8dd70.tar.xz linux-dev-8810d7feee5a0cf88d7854f4ad4930a4fab8dd70.zip | |
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 <niklas.cassel@wdc.com>
Link: https://lore.kernel.org/r/20220414173037.1381927-1-niklas.cassel@wdc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/kernel/cpu.c | 4 |
1 files changed, 4 insertions, 0 deletions
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); } |