From 6587553031d33f3abbf33b7431a66f0c881d0def Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Sat, 27 Jan 2018 12:40:13 +0100 Subject: [PATCH] s390/runtime_instrumentation: re-add signum system call parameter Add the signum system call parameter for documentation purposes only, and without checking if the passed value is a valid real-time signal. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/runtime_instr.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/arch/s390/kernel/runtime_instr.c b/arch/s390/kernel/runtime_instr.c index 09f5bf0d5c0c..125c7f6e8715 100644 --- a/arch/s390/kernel/runtime_instr.c +++ b/arch/s390/kernel/runtime_instr.c @@ -18,6 +18,8 @@ #include #include +#include "entry.h" + /* empty control block to disable RI by loading it */ struct runtime_instr_cb runtime_instr_empty_cb; @@ -59,7 +61,13 @@ static void init_runtime_instr_cb(struct runtime_instr_cb *cb) cb->v = 1; } -SYSCALL_DEFINE1(s390_runtime_instr, int, command) +/* + * The signum argument is unused. In older kernels it was used to + * specify a real-time signal. For backwards compatibility user space + * should pass a valid real-time signal number (the signum argument + * was checked in older kernels). + */ +SYSCALL_DEFINE2(s390_runtime_instr, int, command, int, signum) { struct runtime_instr_cb *cb; -- 2.11.0