uml: fix a compile error

Fix

arch/um/sys-i386/signal.c: In function 'copy_sc_from_user':
arch/um/sys-i386/signal.c:182: warning: dereferencing 'void *' pointer
arch/um/sys-i386/signal.c:182: error: request for member '_fxsr_env' in something not a structure or union

Signed-off-by: WANG Cong <wangcong@zeuux.org>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/um/sys-i386/signal.c b/arch/um/sys-i386/signal.c
index fd0c25ad6af3..129647375a6c 100644
--- a/arch/um/sys-i386/signal.c
+++ b/arch/um/sys-i386/signal.c
@@ -179,7 +179,8 @@ static int copy_sc_from_user(struct pt_regs *regs,
         if (have_fpx_regs) {
                 struct user_fxsr_struct fpx;
 
-                err = copy_from_user(&fpx, &sc.fpstate->_fxsr_env[0],
+                err = copy_from_user(&fpx,
+                        &((struct _fpstate __user *)sc.fpstate)->_fxsr_env[0],
                                      sizeof(struct user_fxsr_struct));
                 if (err)
                         return 1;