[PATCH] ia64: compat_ioctl.c support

The attached patch (against 2.6) helps IA-32 applications take advantage of the
generic 32 bit (fs/compat_ioctl.c) ioctl handlers.

arch/ia64/ia32/Makefile

@@ -4,3 +4,5 @@
 
 obj-y := ia32_entry.o sys_ia32.o ia32_ioctl.o ia32_signal.o \
 	 ia32_support.o ia32_traps.o binfmt_elf32.o ia32_ldt.o
+
+CFLAGS_ia32_ioctl.o += -Ifs/

include/asm-ia64/compat.h

@@ -133,7 +133,7 @@ static __inline__ void *
 compat_alloc_user_space (long len)
 {
 	struct pt_regs *regs = ia64_task_regs(current);
-	return (void *) ((regs->r12 & -16) - len);
+	return (void *) (((regs->r12 & 0xffffffff) & -16) - len);
 }
 
 #endif /* _ASM_IA64_COMPAT_H */

include/asm-ia64/uaccess.h

@@ -240,6 +240,18 @@ extern unsigned long __copy_user (void *to, const void *from, unsigned long coun
 	__cu_len;										\
 })
 
+#define __copy_in_user(to, from, size)          \
+        __copy_user((to), (from), (size))
+
+static inline unsigned long
+copy_in_user (void *to, const void *from, unsigned long n)
+{
+	if (likely(access_ok(VERIFY_READ, from, n) &&
+	    access_ok(VERIFY_WRITE, to, n)))
+		n = __copy_user(to, from, n);
+	return n;
+}
+
 extern unsigned long __do_clear_user (void *, unsigned long);
 
 #define __clear_user(to,n)			\