semtimedop(): move compat to native

... and finally kill the sodding compat_convert_timespec()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

4 files changed, 33 insertions, 53 deletions

diff --git a/include/linux/compat.h b/include/linux/compat.h
index 5a6a109b4a50..edae425ca8c0 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -171,15 +171,6 @@ extern int get_compat_itimerspec64(struct itimerspec64 *its,
 extern int put_compat_itimerspec64(const struct itimerspec64 *its,
                         struct compat_itimerspec __user *uits);
 
-/*
- * This function convert a timespec if necessary and returns a *user
- * space* pointer.  If no conversion is necessary, it returns the
- * initial pointer.  NULL is a legitimate argument and will always
- * output NULL.
- */
-extern int compat_convert_timespec(struct timespec __user **,
-                                   const void __user *);
-
 struct compat_iovec {
         compat_uptr_t   iov_base;
         compat_size_t   iov_len;
diff --git a/ipc/compat.c b/ipc/compat.c
index 871d07da0a52..b17bf93d7b49 100644
--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -79,13 +79,3 @@ void to_compat_ipc_perm(struct compat_ipc_perm *to, struct ipc64_perm *from)
         to->mode = from->mode;
         to->seq = from->seq;
 }
-
-COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
-                       unsigned, nsops,
-                       const struct compat_timespec __user *, timeout)
-{
-        struct timespec __user *ts64;
-        if (compat_convert_timespec(&ts64, timeout))
-                return -EFAULT;
-        return sys_semtimedop(semid, tsems, nsops, ts64);
-}
diff --git a/ipc/sem.c b/ipc/sem.c
index fcf064d6046a..6b832b7fa9fc 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1855,8 +1855,8 @@ out:
         return un;
 }
 
-SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
-                unsigned, nsops, const struct timespec __user *, timeout)
+static long do_semtimedop(int semid, struct sembuf __user *tsops,
+                unsigned nsops, const struct timespec *timeout)
 {
         int error = -EINVAL;
         struct sem_array *sma;
@@ -1887,17 +1887,12 @@ SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
         }
 
         if (timeout) {
-                struct timespec _timeout;
-                if (copy_from_user(&_timeout, timeout, sizeof(*timeout))) {
-                        error = -EFAULT;
-                        goto out_free;
-                }
-                if (_timeout.tv_sec < 0 || _timeout.tv_nsec < 0 ||
-                        _timeout.tv_nsec >= 1000000000L) {
+                if (timeout->tv_sec < 0 || timeout->tv_nsec < 0 ||
+                        timeout->tv_nsec >= 1000000000L) {
                         error = -EINVAL;
                         goto out_free;
                 }
-                jiffies_left = timespec_to_jiffies(&_timeout);
+                jiffies_left = timespec_to_jiffies(timeout);
         }
 
         max = 0;
@@ -2112,10 +2107,37 @@ out_free:
         return error;
 }
 
+SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
+                unsigned, nsops, const struct timespec __user *, timeout)
+{
+        if (timeout) {
+                struct timespec ts;
+                if (copy_from_user(&ts, timeout, sizeof(*timeout)))
+                        return -EFAULT;
+                return do_semtimedop(semid, tsops, nsops, &ts);
+        }
+        return do_semtimedop(semid, tsops, nsops, NULL);
+}
+
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
+                       unsigned, nsops,
+                       const struct compat_timespec __user *, timeout)
+{
+        if (timeout) {
+                struct timespec ts;
+                if (compat_get_timespec(&ts, timeout))
+                        return -EFAULT;
+                return do_semtimedop(semid, tsems, nsops, &ts);
+        }
+        return do_semtimedop(semid, tsems, nsops, NULL);
+}
+#endif
+
 SYSCALL_DEFINE3(semop, int, semid, struct sembuf __user *, tsops,
                 unsigned, nsops)
 {
-        return sys_semtimedop(semid, tsops, nsops, NULL);
+        return do_semtimedop(semid, tsops, nsops, NULL);
 }
 
 /* If CLONE_SYSVSEM is set, establish sharing of SEM_UNDO state between
diff --git a/kernel/compat.c b/kernel/compat.c
index 6f0a0e723a06..772e038d04d9 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -200,29 +200,6 @@ int compat_put_timespec(const struct timespec *ts, void __user *uts)
 }
 EXPORT_SYMBOL_GPL(compat_put_timespec);
 
-int compat_convert_timespec(struct timespec __user **kts,
-                            const void __user *cts)
-{
-        struct timespec ts;
-        struct timespec __user *uts;
-
-        if (!cts || COMPAT_USE_64BIT_TIME) {
-                *kts = (struct timespec __user *)cts;
-                return 0;
-        }
-
-        uts = compat_alloc_user_space(sizeof(ts));
-        if (!uts)
-                return -EFAULT;
-        if (compat_get_timespec(&ts, cts))
-                return -EFAULT;
-        if (copy_to_user(uts, &ts, sizeof(ts)))
-                return -EFAULT;
-
-        *kts = uts;
-        return 0;
-}
-
 int get_compat_itimerval(struct itimerval *o, const struct compat_itimerval __user *i)
 {
         struct compat_itimerval v32;