switch epoll_pwait to COMPAT_SYSCALL_DEFINE

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

5 files changed, 50 insertions, 63 deletions

diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index a1dda9c67efe..52bea71d93e6 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -1270,16 +1270,6 @@ ENTRY(sys_getcpu_wrapper)
         llgtr   %r4,%r4                 # struct getcpu_cache *
         jg      sys_getcpu
 
-ENTRY(compat_sys_epoll_pwait_wrapper)
-        lgfr    %r2,%r2                 # int
-        llgtr   %r3,%r3                 # struct compat_epoll_event *
-        lgfr    %r4,%r4                 # int
-        lgfr    %r5,%r5                 # int
-        llgtr   %r6,%r6                 # compat_sigset_t *
-        llgf    %r0,164(%r15)           # compat_size_t
-        stg     %r0,160(%r15)
-        jg      compat_sys_epoll_pwait
-
 ENTRY(compat_sys_utimes_wrapper)
         llgtr   %r2,%r2                 # char *
         llgtr   %r3,%r3                 # struct compat_timeval *
diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S
index 5f3f7fbc5465..63d6b4343193 100644
--- a/arch/s390/kernel/syscalls.S
+++ b/arch/s390/kernel/syscalls.S
@@ -320,7 +320,7 @@ SYSCALL(sys_tee,sys_tee,sys_tee_wrapper)
 SYSCALL(sys_vmsplice,sys_vmsplice,compat_sys_vmsplice_wrapper)
 NI_SYSCALL                                                      /* 310 sys_move_pages */
 SYSCALL(sys_getcpu,sys_getcpu,sys_getcpu_wrapper)
-SYSCALL(sys_epoll_pwait,sys_epoll_pwait,compat_sys_epoll_pwait_wrapper)
+SYSCALL(sys_epoll_pwait,sys_epoll_pwait,compat_sys_epoll_pwait)
 SYSCALL(sys_utimes,sys_utimes,compat_sys_utimes_wrapper)
 SYSCALL(sys_s390_fallocate,sys_fallocate,sys_fallocate_wrapper)
 SYSCALL(sys_utimensat,sys_utimensat,compat_sys_utimensat_wrapper)       /* 315 */
diff --git a/fs/compat.c b/fs/compat.c
index 2ae2a98891cd..45137a3832f3 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -44,7 +44,6 @@
 #include <linux/signal.h>
 #include <linux/poll.h>
 #include <linux/mm.h>
-#include <linux/eventpoll.h>
 #include <linux/fs_struct.h>
 #include <linux/slab.h>
 #include <linux/pagemap.h>
@@ -1659,54 +1658,6 @@ asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
         return ret;
 }
 
-#ifdef CONFIG_EPOLL
-
-asmlinkage long compat_sys_epoll_pwait(int epfd,
-                        struct compat_epoll_event __user *events,
-                        int maxevents, int timeout,
-                        const compat_sigset_t __user *sigmask,
-                        compat_size_t sigsetsize)
-{
-        long err;
-        compat_sigset_t csigmask;
-        sigset_t ksigmask, sigsaved;
-
-        /*
-         * If the caller wants a certain signal mask to be set during the wait,
-         * we apply it here.
-         */
-        if (sigmask) {
-                if (sigsetsize != sizeof(compat_sigset_t))
-                        return -EINVAL;
-                if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
-                        return -EFAULT;
-                sigset_from_compat(&ksigmask, &csigmask);
-                sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
-                sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
-        }
-
-        err = sys_epoll_wait(epfd, events, maxevents, timeout);
-
-        /*
-         * If we changed the signal mask, we need to restore the original one.
-         * In case we've got a signal while waiting, we do not restore the
-         * signal mask yet, and we allow do_signal() to deliver the signal on
-         * the way back to userspace, before the signal mask is restored.
-         */
-        if (sigmask) {
-                if (err == -EINTR) {
-                        memcpy(&current->saved_sigmask, &sigsaved,
-                               sizeof(sigsaved));
-                        set_restore_sigmask();
-                } else
-                        sigprocmask(SIG_SETMASK, &sigsaved, NULL);
-        }
-
-        return err;
-}
-
-#endif /* CONFIG_EPOLL */
-
 #ifdef CONFIG_FHANDLE
 /*
  * Exactly like fs/open.c:sys_open_by_handle_at(), except that it
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 9fec1836057a..495d15558f42 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -40,6 +40,7 @@
 #include <linux/atomic.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
+#include <linux/compat.h>
 
 /*
  * LOCKING:
@@ -1940,6 +1941,52 @@ SYSCALL_DEFINE6(epoll_pwait, int, epfd, struct epoll_event __user *, events,
         return error;
 }
 
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE6(epoll_pwait, int, epfd,
+                        struct epoll_event __user *, events,
+                        int, maxevents, int, timeout,
+                        const compat_sigset_t __user *, sigmask,
+                        compat_size_t, sigsetsize)
+{
+        long err;
+        compat_sigset_t csigmask;
+        sigset_t ksigmask, sigsaved;
+
+        /*
+         * If the caller wants a certain signal mask to be set during the wait,
+         * we apply it here.
+         */
+        if (sigmask) {
+                if (sigsetsize != sizeof(compat_sigset_t))
+                        return -EINVAL;
+                if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
+                        return -EFAULT;
+                sigset_from_compat(&ksigmask, &csigmask);
+                sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
+                sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
+        }
+
+        err = sys_epoll_wait(epfd, events, maxevents, timeout);
+
+        /*
+         * If we changed the signal mask, we need to restore the original one.
+         * In case we've got a signal while waiting, we do not restore the
+         * signal mask yet, and we allow do_signal() to deliver the signal on
+         * the way back to userspace, before the signal mask is restored.
+         */
+        if (sigmask) {
+                if (err == -EINTR) {
+                        memcpy(&current->saved_sigmask, &sigsaved,
+                               sizeof(sigsaved));
+                        set_restore_sigmask();
+                } else
+                        sigprocmask(SIG_SETMASK, &sigsaved, NULL);
+        }
+
+        return err;
+}
+#endif
+
 static int __init eventpoll_init(void)
 {
         struct sysinfo si;
diff --git a/include/linux/compat.h b/include/linux/compat.h
index ad299afcd488..cdec8f2e9e21 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -432,10 +432,9 @@ asmlinkage long compat_sys_ptrace(compat_long_t request, compat_long_t pid,
 /*
  * epoll (fs/eventpoll.c) compat bits follow ...
  */
-struct epoll_event;
-#define compat_epoll_event      epoll_event
+struct epoll_event;     /* fortunately, this one is fixed-layout */
 asmlinkage long compat_sys_epoll_pwait(int epfd,
-                        struct compat_epoll_event __user *events,
+                        struct epoll_event __user *events,
                         int maxevents, int timeout,
                         const compat_sigset_t __user *sigmask,
                         compat_size_t sigsetsize);