On 1/25/24 3:16 PM, Kunwu Chan wrote:
> This part was commented in about 17 years before.
> If there are no plans to enable this part code in the future,
> we can remove this dead code.
>
> Signed-off-by: Kunwu Chan <chen...@kylinos.cn>
> ---
> arch/powerpc/include/asm/book3s/64/mmu-hash.h | 22 -------------------
> 1 file changed, 22 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h
> b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
> index 1c4eebbc69c9..d39ec7134a78 100644
> --- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h
> +++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
> @@ -731,26 +731,6 @@ struct hash_mm_context {
> #endif /* CONFIG_PPC_SUBPAGE_PROT */
> };
>
> -#if 0
> -/*
> - * The code below is equivalent to this function for arguments
> - * < 2^VSID_BITS, which is all this should ever be called
> - * with. However gcc is not clever enough to compute the
> - * modulus (2^n-1) without a second multiply.
> - */
> -#define vsid_scramble(protovsid, size) \
> - ((((protovsid) * VSID_MULTIPLIER_##size) % VSID_MODULUS_##size))
> -
> -/* simplified form avoiding mod operation */
> -#define vsid_scramble(protovsid, size) \
> - ({ \
> - unsigned long x; \
> - x = (protovsid) * VSID_MULTIPLIER_##size; \
> - x = (x >> VSID_BITS_##size) + (x & VSID_MODULUS_##size); \
> - (x + ((x+1) >> VSID_BITS_##size)) & VSID_MODULUS_##size; \
> - })
> -
> -#else /* 1 */
> static inline unsigned long vsid_scramble(unsigned long protovsid,
> unsigned long vsid_multiplier, int vsid_bits)
> {
> @@ -764,8 +744,6 @@ static inline unsigned long vsid_scramble(unsigned long
> protovsid,
> return (vsid + ((vsid + 1) >> vsid_bits)) & vsid_modulus;
> }
>
> -#endif /* 1 */
> -
> /* Returns the segment size indicator for a user address */
> static inline int user_segment_size(unsigned long addr)
> {
That was done to make sure one can follow the actual compiled code better.
-aneesh
