Re: [PATCH] LoongArch: Correct the definitions related to CSR_CPUID_COREID{_WIDTH}
From: Qiang Ma
Date: Tue Apr 28 2026 - 09:37:54 EST
在 2026/4/28 20:47, Huacai Chen 写道:
Can you do some investigation about the history before coding?
9559d5806319a9254d9053b22a31324e1929aac ("LoongArch: Increase max
supported CPUs up to 2048")
Uh, uh, uh, my fault. I'll be more careful next time. Besides the document, there's also the code history submission.
Huacai
On Tue, Apr 28, 2026 at 8:36 PM Qiang Ma <maqianga@xxxxxxxxxxxxx> wrote:
The valid bits of CPU Identity (CPUID) are 0 to 8
according to LoongArch Reference Manual, so change
11 to 9 for the related code.
Link: https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#cpu-identity
Signed-off-by: Qiang Ma <maqianga@xxxxxxxxxxxxx>
---
arch/loongarch/include/asm/loongarch.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/loongarch/include/asm/loongarch.h b/arch/loongarch/include/asm/loongarch.h
index 2a6bc99177d8..bc47df90fee6 100644
--- a/arch/loongarch/include/asm/loongarch.h
+++ b/arch/loongarch/include/asm/loongarch.h
@@ -429,8 +429,8 @@
/* Config CSR registers */
#define LOONGARCH_CSR_CPUID 0x20 /* CPU core id */
-#define CSR_CPUID_COREID_WIDTH 11
-#define CSR_CPUID_COREID _ULCAST_(0x7ff)
+#define CSR_CPUID_COREID_WIDTH 9
+#define CSR_CPUID_COREID _ULCAST_(0x1ff)
#define LOONGARCH_CSR_PRCFG1 0x21 /* Config1 */
#define CSR_CONF1_VSMAX_SHIFT 12
--
2.20.1