Re: [RFC PATCH for 4.18 10/16] powerpc: Wire up restartable sequences system call

[Michael Ellerman]

Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> writes:

> From: Boqun Feng <boqun.feng@xxxxxxxxx>
>
> Wire up the rseq system call on powerpc.
>
> This provides an ABI improving the speed of a user-space getcpu
> operation on powerpc by skipping the getcpu system call on the fast
> path, as well as improving the speed of user-space operations on per-cpu
> data compared to using load-reservation/store-conditional atomics.
>
> Signed-off-by: Boqun Feng <boqun.feng@xxxxxxxxx>
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
> CC: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> CC: Paul Mackerras <paulus@xxxxxxxxx>
> CC: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
> CC: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> CC: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
> CC: linuxppc-dev@xxxxxxxxxxxxxxxx
> ---
>  arch/powerpc/include/asm/systbl.h      | 1 +
>  arch/powerpc/include/asm/unistd.h      | 2 +-
>  arch/powerpc/include/uapi/asm/unistd.h | 1 +
>  3 files changed, 3 insertions(+), 1 deletion(-)

Looks fine to me.

I don't have any other new syscalls in my next, so this should not
conflict with anything for 4.18.

Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> (powerpc)


cheers