[PATCH v2 03/10] compat: enable compat_get/put_timespec64 always

[Deepa Dinamani <deepa.kernel@gmail.com>]

These functions are used in the repurposed compat syscalls
to provide backward compatibility for using 32 bit time_t
on 32 bit systems.

Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
---
 include/linux/compat.h      |  2 -
 include/linux/compat_time.h |  4 ++
 kernel/Makefile             |  2 +-
 kernel/compat.c             | 92 +++++++++++++++++++++++----------------------
 4 files changed, 53 insertions(+), 47 deletions(-)

diff --git a/include/linux/compat.h b/include/linux/compat.h
index 2f79dac5ed65..e06f11886000 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -168,8 +168,6 @@ extern int compat_get_timespec(struct timespec *, const void __user *);
 extern int compat_put_timespec(const struct timespec *, void __user *);
 extern int compat_get_timeval(struct timeval *, const void __user *);
 extern int compat_put_timeval(const struct timeval *, void __user *);
-extern int compat_get_timespec64(struct timespec64 *, const void __user *);
-extern int compat_put_timespec64(const struct timespec64 *, void __user *);
 extern int get_compat_itimerspec64(struct itimerspec64 *its,
 			const struct compat_itimerspec __user *uits);
 extern int put_compat_itimerspec64(const struct itimerspec64 *its,
diff --git a/include/linux/compat_time.h b/include/linux/compat_time.h
index 56a54a1e4355..31f2774f1994 100644
--- a/include/linux/compat_time.h
+++ b/include/linux/compat_time.h
@@ -3,6 +3,7 @@
 #define _LINUX_COMPAT_TIME_H
 
 #include <linux/types.h>
+#include <linux/time64.h>
 
 typedef s32		compat_time_t;
 
@@ -16,4 +17,7 @@ struct compat_timeval {
 	s32		tv_usec;
 };
 
+extern int compat_get_timespec64(struct timespec64 *, const void __user *);
+extern int compat_put_timespec64(const struct timespec64 *, void __user *);
+
 #endif /* _LINUX_COMPAT_TIME_H */
diff --git a/kernel/Makefile b/kernel/Makefile
index 172d151d429c..2e3df3deee18 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -66,7 +66,7 @@ obj-$(CONFIG_KEXEC_CORE) += kexec_core.o
 obj-$(CONFIG_KEXEC) += kexec.o
 obj-$(CONFIG_KEXEC_FILE) += kexec_file.o
 obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
-obj-$(CONFIG_COMPAT) += compat.o
+obj-y += compat.o
 obj-$(CONFIG_CGROUPS) += cgroup/
 obj-$(CONFIG_UTS_NS) += utsname.o
 obj-$(CONFIG_USER_NS) += user_namespace.o
diff --git a/kernel/compat.c b/kernel/compat.c
index d1cee656a7ed..42653ac977c0 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -30,6 +30,52 @@
 
 #include <linux/uaccess.h>
 
+static int __compat_get_timespec64(struct timespec64 *ts64,
+				   const struct compat_timespec __user *cts)
+{
+	struct compat_timespec ts;
+	int ret;
+
+	ret = copy_from_user(&ts, cts, sizeof(ts));
+	if (ret)
+		return -EFAULT;
+
+	ts64->tv_sec = ts.tv_sec;
+	ts64->tv_nsec = ts.tv_nsec;
+
+	return 0;
+}
+
+static int __compat_put_timespec64(const struct timespec64 *ts64,
+				   struct compat_timespec __user *cts)
+{
+	struct compat_timespec ts = {
+		.tv_sec = ts64->tv_sec,
+		.tv_nsec = ts64->tv_nsec
+	};
+	return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
+}
+
+int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
+{
+	if (COMPAT_USE_64BIT_TIME)
+		return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
+	else
+		return __compat_get_timespec64(ts, uts);
+}
+EXPORT_SYMBOL_GPL(compat_get_timespec64);
+
+int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
+{
+	if (COMPAT_USE_64BIT_TIME)
+		return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
+	else
+		return __compat_put_timespec64(ts, uts);
+}
+EXPORT_SYMBOL_GPL(compat_put_timespec64);
+
+#ifdef CONFIG_COMPAT
+
 int compat_get_timex(struct timex *txc, const struct compat_timex __user *utp)
 {
 	struct compat_timex tx32;
@@ -120,50 +166,6 @@ static int __compat_put_timespec(const struct timespec *ts, struct compat_timesp
 			__put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
 }
 
-static int __compat_get_timespec64(struct timespec64 *ts64,
-				   const struct compat_timespec __user *cts)
-{
-	struct compat_timespec ts;
-	int ret;
-
-	ret = copy_from_user(&ts, cts, sizeof(ts));
-	if (ret)
-		return -EFAULT;
-
-	ts64->tv_sec = ts.tv_sec;
-	ts64->tv_nsec = ts.tv_nsec;
-
-	return 0;
-}
-
-static int __compat_put_timespec64(const struct timespec64 *ts64,
-				   struct compat_timespec __user *cts)
-{
-	struct compat_timespec ts = {
-		.tv_sec = ts64->tv_sec,
-		.tv_nsec = ts64->tv_nsec
-	};
-	return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
-}
-
-int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
-{
-	if (COMPAT_USE_64BIT_TIME)
-		return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
-	else
-		return __compat_get_timespec64(ts, uts);
-}
-EXPORT_SYMBOL_GPL(compat_get_timespec64);
-
-int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
-{
-	if (COMPAT_USE_64BIT_TIME)
-		return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
-	else
-		return __compat_put_timespec64(ts, uts);
-}
-EXPORT_SYMBOL_GPL(compat_put_timespec64);
-
 int compat_get_timeval(struct timeval *tv, const void __user *utv)
 {
 	if (COMPAT_USE_64BIT_TIME)
@@ -582,3 +584,5 @@ void __user *compat_alloc_user_space(unsigned long len)
 	return ptr;
 }
 EXPORT_SYMBOL_GPL(compat_alloc_user_space);
+
+#endif
-- 
2.14.1