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(-) diff --git a/arch/powerpc/include/asm/systbl.h b/arch/powerpc/include/asm/systbl.h index 449912f057f6..964321a5799c 100644 --- a/arch/powerpc/include/asm/systbl.h +++ b/arch/powerpc/include/asm/systbl.h @@ -389,3 +389,4 @@ COMPAT_SYS_SPU(preadv2) COMPAT_SYS_SPU(pwritev2) SYSCALL(kexec_file_load) SYSCALL(statx) +SYSCALL(rseq) diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h index 9ba11dbcaca9..e76bd5601ea4 100644 --- a/arch/powerpc/include/asm/unistd.h +++ b/arch/powerpc/include/asm/unistd.h @@ -12,7 +12,7 @@ #include <uapi/asm/unistd.h> -#define NR_syscalls 384 +#define NR_syscalls 385 #define __NR__exit __NR_exit diff --git a/arch/powerpc/include/uapi/asm/unistd.h b/arch/powerpc/include/uapi/asm/unistd.h index df8684f31919..b1980fcd56d5 100644 --- a/arch/powerpc/include/uapi/asm/unistd.h +++ b/arch/powerpc/include/uapi/asm/unistd.h @@ -395,5 +395,6 @@ #define __NR_pwritev2 381 #define __NR_kexec_file_load 382 #define __NR_statx 383 +#define __NR_rseq 384 #endif /* _UAPI_ASM_POWERPC_UNISTD_H_ */ -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
