m68k: Fix assembler constraint to prevent overeager gcc optimisation

Passing the address of a variable as an operand to an asm statement
doesn't mark the value of this variable as used, so gcc may optimize its
initialisation away.  Fix this by using the "m" constraint instead.

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: stable@vger.kernel.org

1 files changed, 4 insertions, 4 deletions

diff --git a/arch/m68k/atari/config.c b/arch/m68k/atari/config.c
index 4203d101363..c4ac15c4f06 100644
--- a/arch/m68k/atari/config.c
+++ b/arch/m68k/atari/config.c
@@ -414,9 +414,9 @@ void __init config_atari(void)
                                          * FDC val = 4 -> Supervisor only */
                 asm volatile ("\n"
                         "       .chip   68030\n"
-                        "       pmove   %0@,%/tt1\n"
+                        "       pmove   %0,%/tt1\n"
                         "       .chip   68k"
-                        : : "a" (&tt1_val));
+                        : : "m" (tt1_val));
         } else {
                 asm volatile ("\n"
                         "       .chip   68040\n"
@@ -569,10 +569,10 @@ static void atari_reset(void)
                         : "d0");
         } else
                 asm volatile ("\n"
-                        "       pmove   %0@,%%tc\n"
+                        "       pmove   %0,%%tc\n"
                         "       jmp     %1@"
                         : /* no outputs */
-                        : "a" (&tc_val), "a" (reset_addr));
+                        : "m" (tc_val), "a" (reset_addr));
 }