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s390/runtime_instrumentation: re-add signum system call parameter

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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 <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2018-01-27 12:40:13 +01:00 committed by Martin Schwidefsky
parent 81507f38d4
commit 6587553031
1 changed files with 9 additions and 1 deletions
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10
arch/s390/kernel/runtime_instr.c
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@ -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;