Re: [PATCH 2/2] arch: Reserve map_shadow_stack() syscall number for all architectures

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On Mon, 2023-09-11 at 18:02 +0000, Sohil Mehta wrote:
> diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl
> b/arch/powerpc/kernel/syscalls/syscall.tbl
> index 20e50586e8a2..2767b8a42636 100644
> --- a/arch/powerpc/kernel/syscalls/syscall.tbl
> +++ b/arch/powerpc/kernel/syscalls/syscall.tbl
> @@ -539,3 +539,4 @@
>  450    nospu   set_mempolicy_home_node         sys_set_mempolicy_hom
> e_node
>  451    common  cachestat                       sys_cachestat
>  452    common  fchmodat2                       sys_fchmodat2
> +453    common  map_shadow_stack                sys_map_shadow_stack

I noticed in powerpc, the not implemented syscalls are manually mapped
to sys_ni_syscall. It also has some special extra sys_ni_syscall()
implementation bits to handle both ARCH_HAS_SYSCALL_WRAPPER and
!ARCH_HAS_SYSCALL_WRAPPER. So wondering if it might need special
treatment. Did you see those parts?





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