linux-kernel - [PATCH 12/14] y2038: sched: Change sched_rr_get_interval to use __kernel

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Message-Id: <20180827194531.3796559-13-arnd@arndb.de>
Date:   Mon, 27 Aug 2018 21:45:29 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     tglx@...utronix.de
Cc:     y2038@...ts.linaro.org, linux-api@...r.kernel.org,
        Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, deepa.kernel@...il.com,
        linux-arch@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 12/14] y2038: sched: Change sched_rr_get_interval to use __kernel_timespec

This is a preparation patch for converting sys_sched_rr_get_interval to
work with 64-bit time_t on 32-bit architectures. The 'interval' argument
is changed to struct __kernel_timespec, which will be redefined using
64-bit time_t in the future. The compat version of the system call in
turn is enabled for compilation with CONFIG_COMPAT_32BIT_TIME so
the individual 32-bit architectures can share the handling of the
traditional argument with 64-bit architectures providing it for their
compat mode.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/linux/syscalls.h | 2 +-
 kernel/sched/core.c      | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 95e795fb0593..5642016a312d 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -614,7 +614,7 @@ asmlinkage long sys_sched_yield(void);
 asmlinkage long sys_sched_get_priority_max(int policy);
 asmlinkage long sys_sched_get_priority_min(int policy);
 asmlinkage long sys_sched_rr_get_interval(pid_t pid,
-					struct timespec __user *interval);
+				struct __kernel_timespec __user *interval);
 
 /* kernel/signal.c */
 asmlinkage long sys_restart_syscall(void);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 8287b75ed961..39af2bec2b39 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5243,7 +5243,7 @@ static int sched_rr_get_interval(pid_t pid, struct timespec64 *t)
  * an error code.
  */
 SYSCALL_DEFINE2(sched_rr_get_interval, pid_t, pid,
-		struct timespec __user *, interval)
+		struct __kernel_timespec __user *, interval)
 {
 	struct timespec64 t;
 	int retval = sched_rr_get_interval(pid, &t);
@@ -5254,7 +5254,7 @@ SYSCALL_DEFINE2(sched_rr_get_interval, pid_t, pid,
 	return retval;
 }
 
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_COMPAT_32BIT_TIME
 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
 		       compat_pid_t, pid,
 		       struct old_timespec32 __user *, interval)
-- 
2.18.0