time: make adjtime compat handling available for 32 bit

We want to reuse the compat_timex handling on 32-bit architectures the
same way we are using the compat handling for timespec when moving to
64-bit time_t.

Move all definitions related to compat_timex out of the compat code
into the normal timekeeping code, along with a rename to old_timex32,
corresponding to the timespec/timeval structures, and make it controlled
by CONFIG_COMPAT_32BIT_TIME, which 32-bit architectures will then select.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

2 files changed, 33 insertions, 34 deletions

diff --git a/include/linux/compat.h b/include/linux/compat.h
index 056be0d03722..657ca6abd855 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -132,37 +132,6 @@ struct compat_tms {
 	compat_clock_t		tms_cstime;
 };
 
-struct compat_timex {
-	compat_uint_t modes;
-	compat_long_t offset;
-	compat_long_t freq;
-	compat_long_t maxerror;
-	compat_long_t esterror;
-	compat_int_t status;
-	compat_long_t constant;
-	compat_long_t precision;
-	compat_long_t tolerance;
-	struct old_timeval32 time;
-	compat_long_t tick;
-	compat_long_t ppsfreq;
-	compat_long_t jitter;
-	compat_int_t shift;
-	compat_long_t stabil;
-	compat_long_t jitcnt;
-	compat_long_t calcnt;
-	compat_long_t errcnt;
-	compat_long_t stbcnt;
-	compat_int_t tai;
-
-	compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
-	compat_int_t:32; compat_int_t:32; compat_int_t:32; compat_int_t:32;
-	compat_int_t:32; compat_int_t:32; compat_int_t:32;
-};
-
-struct timex;
-int compat_get_timex(struct timex *, const struct compat_timex __user *);
-int compat_put_timex(struct compat_timex __user *, const struct timex *);
-
 #define _COMPAT_NSIG_WORDS	(_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 
 typedef struct {
@@ -808,7 +777,7 @@ asmlinkage long compat_sys_gettimeofday(struct old_timeval32 __user *tv,
 		struct timezone __user *tz);
 asmlinkage long compat_sys_settimeofday(struct old_timeval32 __user *tv,
 		struct timezone __user *tz);
-asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
+asmlinkage long compat_sys_adjtimex(struct old_timex32 __user *utp);
 
 /* kernel/timer.c */
 asmlinkage long compat_sys_sysinfo(struct compat_sysinfo __user *info);
@@ -911,7 +880,7 @@ asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 					     struct file_handle __user *handle,
 					     int flags);
 asmlinkage long compat_sys_clock_adjtime(clockid_t which_clock,
-					 struct compat_timex __user *tp);
+					 struct old_timex32 __user *tp);
 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 				    unsigned vlen, unsigned int flags);
 asmlinkage ssize_t compat_sys_process_vm_readv(compat_pid_t pid,
diff --git a/include/linux/time32.h b/include/linux/time32.h
index 118b9977080c..820a22e2b98b 100644
--- a/include/linux/time32.h
+++ b/include/linux/time32.h
@@ -10,6 +10,7 @@
  */
 
 #include <linux/time64.h>
+#include <linux/timex.h>
 
 #define TIME_T_MAX	(time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
 
@@ -35,13 +36,42 @@ struct old_utimbuf32 {
 	old_time32_t	modtime;
 };
 
+struct old_timex32 {
+	u32 modes;
+	s32 offset;
+	s32 freq;
+	s32 maxerror;
+	s32 esterror;
+	s32 status;
+	s32 constant;
+	s32 precision;
+	s32 tolerance;
+	struct old_timeval32 time;
+	s32 tick;
+	s32 ppsfreq;
+	s32 jitter;
+	s32 shift;
+	s32 stabil;
+	s32 jitcnt;
+	s32 calcnt;
+	s32 errcnt;
+	s32 stbcnt;
+	s32 tai;
+
+	s32:32; s32:32; s32:32; s32:32;
+	s32:32; s32:32; s32:32; s32:32;
+	s32:32; s32:32; s32:32;
+};
+
 extern int get_old_timespec32(struct timespec64 *, const void __user *);
 extern int put_old_timespec32(const struct timespec64 *, void __user *);
 extern int get_old_itimerspec32(struct itimerspec64 *its,
 			const struct old_itimerspec32 __user *uits);
 extern int put_old_itimerspec32(const struct itimerspec64 *its,
 			struct old_itimerspec32 __user *uits);
-
+struct timex;
+int get_old_timex32(struct timex *, const struct old_timex32 __user *);
+int put_old_timex32(struct old_timex32 __user *, const struct timex *);
 
 #if __BITS_PER_LONG == 64