Re: [PATCH] nios2: ksyms: Declare __mulsi3 export

[Vineet Gupta <vgupta@kernel.org>]

On 10/31/26 16:57, Vineet Gupta wrote:
>> * no generic implementation in kernel, need to copy from
>>     libgcc/lib1funcs.S code:
>>
>> === __divsi3 ===
>> arch/arc/kernel/arcksyms.c
>> arch/nios2/kernel/nios2_ksyms.c
>> arch/openrisc/kernel/or32_ksyms.c
>> -> arch/arm/lib/lib1funcs.S
>>      arch/m68k/lib/divsi3.S
>>      arch/microblaze/lib/divsi3.S
>>      arch/xtensa/lib/divsi3.S
>> === __modsi3 ===
>> arch/arc/kernel/arcksyms.c
>> arch/nios2/kernel/nios2_ksyms.c
>> arch/openrisc/kernel/or32_ksyms.c
>> -> arch/m68k/lib/modsi3.S
>>      arch/microblaze/lib/modsi3.S
>>      arch/xtensa/lib/modsi3.S
>> === __udivsi3 ===
>> arch/arc/kernel/arcksyms.c
>> arch/nios2/kernel/nios2_ksyms.c
>> arch/openrisc/kernel/or32_ksyms.c
>> -> arch/arm/lib/lib1funcs.S
>>      arch/m68k/lib/udivsi3.S
>>      arch/microblaze/lib/udivsi3.S
>>      arch/sh/lib/udivsi3.S
>>      arch/xtensa/lib/udivsi3.S
>> === __umodsi3 ===
>> arch/arc/kernel/arcksyms.c
>> arch/nios2/kernel/nios2_ksyms.c
>> arch/openrisc/kernel/or32_ksyms.c
>> -> arch/arm/lib/lib1funcs.S
>>      arch/m68k/lib/umodsi3.S
>>      arch/microblaze/lib/umodsi3.S
>>      arch/xtensa/lib/umodsi3.S
> ARCv2 has hardware divide so these are not needed, but ARC700 doesn't
> and there's a ton of calls for those.
>
> ┌───────────┬───────┬───────────┐
> │  routine  │ calls │ functions │
> ├───────────┼───────┼───────────┤
> │ __udivsi3 │ 415   │ 238       │
> ├───────────┼───────┼───────────┤
> │ __umodsi3 │ 203   │ 131       │
> ├───────────┼───────┼───────────┤
> │ __divsi3  │ 77    │ 57        │
> ├───────────┼───────┼───────────┤
> │ __modsi3  │ 41    │ 33        │
> └───────────┴───────┴───────────┘
>
> I can take a stab at providing the generic libgcc implementation in
> lib/* but I only expect the arches using libgcc version to switch.

It seems there 4 are always needed together or not at all.
Do we want 4 Kconfig gates or just one will suffice ?

Thx,
-Vineet