[PATCH 2/3] Add generic compat_sys_sched_rr_get_intervalimplementation

[Catalin Marinas]

This patch adds a generic implementation for
compat_sys_sched_rr_get_interval as it is used by other architectures.

Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
---
 include/linux/compat.h |    3 +++
 kernel/compat.c        |   17 +++++++++++++++++
 2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/include/linux/compat.h b/include/linux/compat.h
index e2f5e9a..bbe89b8 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -599,6 +599,9 @@ asmlinkage int compat_sys_sendfile(int out_fd, int in_fd,
 asmlinkage int compat_sys_sendfile64(int out_fd, int in_fd,
 				     compat_loff_t __user *offset, s32 count);
 
+asmlinkage int compat_sys_sched_rr_get_interval(compat_pid_t pid,
+						struct compat_timespec __user *interval);
+
 #else
 
 #define is_compat_task() (0)
diff --git a/kernel/compat.c b/kernel/compat.c
index 5f07388..3961f67 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -1259,6 +1259,23 @@ asmlinkage int compat_sys_sendfile64(int out_fd, int in_fd,
 }
 #endif /* __ARCH_WANT_COMPAT_SYS_SENDFILE64 */
 
+#ifdef __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL
+asmlinkage int compat_sys_sched_rr_get_interval(compat_pid_t pid,
+						struct compat_timespec __user *interval)
+{
+	struct timespec t;
+	int ret;
+	mm_segment_t old_fs = get_fs();
+
+	set_fs(KERNEL_DS);
+	ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
+	set_fs(old_fs);
+	if (put_compat_timespec(&t, interval))
+		return -EFAULT;
+	return ret;
+}
+#endif /* __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL */
+
 /*
  * Allocate user-space memory for the duration of a single system call,
  * in order to marshall parameters inside a compat thunk.