Messages in this thread | | | From | Huacai Chen <> | Date | Sat, 4 Jun 2022 21:11:34 +0800 | Subject | Re: [PATCH for-5.19 2/2] loongarch: Mask out higher bits for get_csr_cpuid |
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Hi, Jiaxun,
On Sat, Jun 4, 2022 at 8:41 PM Jiaxun Yang <jiaxun.yang@flygoat.com> wrote: > > Only low 9 bits of CPUID CSR represents coreid, higher bits > are marked as reserved. In case Loongson may define higher > bits in future, just mask them out for get_csr_cpuid. I think we needn't to modify, until the high bits actually get defined. :)
Huacai
> > Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> > --- > arch/loongarch/include/asm/loongarch.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/loongarch/include/asm/loongarch.h b/arch/loongarch/include/asm/loongarch.h > index 3ba4f7e87cd2..7f3933f747f9 100644 > --- a/arch/loongarch/include/asm/loongarch.h > +++ b/arch/loongarch/include/asm/loongarch.h > @@ -1200,7 +1200,7 @@ static inline u64 drdtime(void) > > static inline unsigned int get_csr_cpuid(void) > { > - return csr_read32(LOONGARCH_CSR_CPUID); > + return csr_read32(LOONGARCH_CSR_CPUID) & CSR_CPUID_COREID; > } > > static inline void csr_any_send(unsigned int addr, unsigned int data, > -- > 2.25.1 >
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