[PATCH 1/3] powerpc/vdso: augment VDSO32 functions to support 64 bits build

[Segher Boessenkool]

On Tue, Dec 21, 2021 at 05:49:33PM +0000, Christophe Leroy wrote:
> diff --git a/arch/powerpc/kernel/vdso32/datapage.S b/arch/powerpc/kernel/vdso32/datapage.S
> index 65244416ab94..db8e167f0166 100644
> --- a/arch/powerpc/kernel/vdso32/datapage.S
> +++ b/arch/powerpc/kernel/vdso32/datapage.S
> @@ -30,11 +30,15 @@ V_FUNCTION_BEGIN(__kernel_get_syscall_map)
>  	mr.	r4,r3
>  	get_datapage	r3
>  	mtlr	r12
> +#ifdef __powerpc64__
> +	addi	r3,r3,CFG_SYSCALL_MAP64
> +#else
>  	addi	r3,r3,CFG_SYSCALL_MAP32
> +#endif
> +	crclr	cr0*4+so
>  	beqlr
>  	li	r0,NR_syscalls
>  	stw	r0,0(r4)
> -	crclr	cr0*4+so
>  	blr

This now clears cr0.3 if r3 is zero on entry.  Is that on purpose?

Rest looks good.

Reviewed-by: Segher Boessenkool <segher at kernel.crashing.org>


Segher