Re: [RFC PATCH for 4.18 10/16] powerpc: Wire up restartable sequences system call
- On Jun 5, 2018, at 1:18 AM, Michael Ellerman m...@ellerman.id.au wrote: > Mathieu Desnoyers writes: > >> From: Boqun Feng >> >> 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 >> Signed-off-by: Mathieu Desnoyers >> CC: Benjamin Herrenschmidt >> CC: Paul Mackerras >> CC: Michael Ellerman >> CC: Peter Zijlstra >> CC: "Paul E. McKenney" >> CC: linuxppc-dev@lists.ozlabs.org >> --- >> 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 (powerpc) Added your ack to the series, thanks! Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
Re: [RFC PATCH for 4.18 10/16] powerpc: Wire up restartable sequences system call
Mathieu Desnoyers writes: > From: Boqun Feng > > 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 > Signed-off-by: Mathieu Desnoyers > CC: Benjamin Herrenschmidt > CC: Paul Mackerras > CC: Michael Ellerman > CC: Peter Zijlstra > CC: "Paul E. McKenney" > CC: linuxppc-dev@lists.ozlabs.org > --- > 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 (powerpc) cheers
[RFC PATCH for 4.18 10/16] powerpc: Wire up restartable sequences system call
From: Boqun Feng 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 Signed-off-by: Mathieu Desnoyers CC: Benjamin Herrenschmidt CC: Paul Mackerras CC: Michael Ellerman CC: Peter Zijlstra CC: "Paul E. McKenney" CC: linuxppc-dev@lists.ozlabs.org --- 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(-) diff --git a/arch/powerpc/include/asm/systbl.h b/arch/powerpc/include/asm/systbl.h index d61f9c96d916..45d4d37495fd 100644 --- a/arch/powerpc/include/asm/systbl.h +++ b/arch/powerpc/include/asm/systbl.h @@ -392,3 +392,4 @@ SYSCALL(statx) SYSCALL(pkey_alloc) SYSCALL(pkey_free) SYSCALL(pkey_mprotect) +SYSCALL(rseq) diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h index daf1ba97a00c..1e9708632dce 100644 --- a/arch/powerpc/include/asm/unistd.h +++ b/arch/powerpc/include/asm/unistd.h @@ -12,7 +12,7 @@ #include -#define NR_syscalls387 +#define NR_syscalls388 #define __NR__exit __NR_exit diff --git a/arch/powerpc/include/uapi/asm/unistd.h b/arch/powerpc/include/uapi/asm/unistd.h index 389c36fd8299..ac5ba55066dd 100644 --- a/arch/powerpc/include/uapi/asm/unistd.h +++ b/arch/powerpc/include/uapi/asm/unistd.h @@ -398,5 +398,6 @@ #define __NR_pkey_alloc384 #define __NR_pkey_free 385 #define __NR_pkey_mprotect 386 +#define __NR_rseq 387 #endif /* _UAPI_ASM_POWERPC_UNISTD_H_ */ -- 2.11.0
