arch: tile: kernel: signal.c: Use __copy_from/to_user() instead of __get/put_user()

setup/restore_sigcontext() want to copy all related registers between
user and kernel. So use block copy instead of each registers copy. Then
can let code simple and clearer (which can avoid compiler's warning):

The related warning (with allmodconfig under tile):

    CC      arch/tile/kernel/signal.o
  In file included from include/linux/poll.h:11:0,
                   from include/linux/ring_buffer.h:7,
                   from include/linux/ftrace_event.h:5,
                   from include/trace/syscall.h:6,
                   from include/linux/syscalls.h:81,
                   from arch/tile/kernel/signal.c:30:
  arch/tile/kernel/signal.c: In function 'setup_sigcontext':
  arch/tile/kernel/signal.c:116:31: warning: iteration 53u invokes undefined behavior [-Waggressive-loop-optimizations]
     err |= __put_user(regs->regs[i], &sc->gregs[i]);
                                 ^
  ./arch/tile/include/asm/uaccess.h:236:26: note: in definition of macro '__put_user_asm'
          : "r" (ptr), "r" (x), "i" (-EFAULT))
                            ^
  ./arch/tile/include/asm/uaccess.h:297:10: note: in expansion of macro '__put_user_8'
    case 8: __put_user_8(x, ptr, __ret); break;   \
            ^
  arch/tile/kernel/signal.c:116:10: note: in expansion of macro '__put_user'
     err |= __put_user(regs->regs[i], &sc->gregs[i]);
            ^
  arch/tile/kernel/signal.c:115:2: note: containing loop
    for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i)
    ^

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

diff --git a/arch/tile/kernel/signal.c b/arch/tile/kernel/signal.c
index 7c2fecc52177573ab79194e701d3a7726dc81af6..491669065ffb07f1dd734f1740ac81690ccc80dd 100644 (file)
--- a/arch/tile/kernel/signal.c
+++ b/arch/tile/kernel/signal.c
@@ -45,8 +45,7 @@
 int restore_sigcontext(struct pt_regs *regs,
                       struct sigcontext __user *sc)
 {
-       int err = 0;
-       int i;
+       int err;
 
        /* Always make any pending restarted system calls return -EINTR */
        current_thread_info()->restart_block.fn = do_no_restart_syscall;
@@ -57,9 +56,7 @@ int restore_sigcontext(struct pt_regs *regs,
         */
        BUILD_BUG_ON(sizeof(struct sigcontext) != sizeof(struct pt_regs));
        BUILD_BUG_ON(sizeof(struct sigcontext) % 8 != 0);
-
-       for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i)
-               err |= __get_user(regs->regs[i], &sc->gregs[i]);
+       err = __copy_from_user(regs, sc, sizeof(*regs));
 
        /* Ensure that the PL is always set to USER_PL. */
        regs->ex1 = PL_ICS_EX1(USER_PL, EX1_ICS(regs->ex1));
@@ -110,12 +107,7 @@ badframe:
 
 int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
 {
-       int i, err = 0;
-
-       for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i)
-               err |= __put_user(regs->regs[i], &sc->gregs[i]);
-
-       return err;
+       return  __copy_to_user(sc, regs, sizeof(*regs));
 }
 
 /*