s390/runtime_instrumentation: re-add signum system call parameter

Web:        https://git.kernel.org/torvalds/c/6587553031d33f3abbf33b7431a66f0c881d0def
Commit:     6587553031d33f3abbf33b7431a66f0c881d0def
Parent:     81507f38d427ebed3291a3c153a798937c998140
Refname:    refs/heads/master
Author:     Heiko Carstens <[email protected]>
AuthorDate: Sat Jan 27 12:40:13 2018 +0100
Committer:  Martin Schwidefsky <[email protected]>
CommitDate: Mon Feb 5 07:34:50 2018 +0100

    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 <[email protected]>
    Signed-off-by: Martin Schwidefsky <[email protected]>
---
 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 <asm/cpu_mf.h>
 #include <asm/irq.h>
 
+#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;
 
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