[RFC PATCH 4/4] powerpc: mm/slb: blacklist symbols from kprobe

[Michael Ellerman]

"Naveen N. Rao" <naveen.n.rao at linux.vnet.ibm.com> writes:

> We can't really take a trap at this point. So, blacklist these symbols.
>
> Reported-by: Anton Blanchard <anton at samba.org>
> Signed-off-by: Naveen N. Rao <naveen.n.rao at linux.vnet.ibm.com>
> ---
>  arch/powerpc/mm/slb_low.S | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/arch/powerpc/mm/slb_low.S b/arch/powerpc/mm/slb_low.S
> index c1c7456..c2bae92 100644
> --- a/arch/powerpc/mm/slb_low.S
> +++ b/arch/powerpc/mm/slb_low.S
> @@ -30,7 +30,7 @@
>   *	r9, r10, r11 are clobbered by this function
>   * No other registers are examined or changed.
>   */
> -_GLOBAL(slb_allocate_realmode)
> +_GLOBAL_NOKPROBE(slb_allocate_realmode)

I think I'd prefer we just leave these as is, and add somewhere nearby:

_ASM_NOKPROBE_SYMBOL(slb_allocate_realmode)


It means someone reading the code doesn't need to worry about the
nokprobe part, just to understand the function. It also means we need
fewer macros :)

cheers