From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 8 Jul 2017 15:40:39 +0000 (-0400)
Subject: teach SYSCALL_DEFINE/COMPAT_SYSCALL_DEFINE to handle __bitwise arguments
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=4f59c718521a0f00b6589da6b8fcea2dc296026d;p=openwrt%2Fstaging%2Fblogic.git

teach SYSCALL_DEFINE/COMPAT_SYSCALL_DEFINE to handle __bitwise arguments

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

diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h
index b9300f8aee10..07a82bc933a7 100644
--- a/arch/s390/include/asm/compat.h
+++ b/arch/s390/include/asm/compat.h
@@ -8,11 +8,12 @@
 #include <linux/sched/task_stack.h>
 #include <linux/thread_info.h>
 
-#define __TYPE_IS_PTR(t) (!__builtin_types_compatible_p(typeof(0?(t)0:0ULL), u64))
+#define __TYPE_IS_PTR(t) (!__builtin_types_compatible_p( \
+				typeof(0?(__force t)0:0ULL), u64))
 
 #define __SC_DELOUSE(t,v) ({ \
 	BUILD_BUG_ON(sizeof(t) > 4 && !__TYPE_IS_PTR(t)); \
-	(t)(__TYPE_IS_PTR(t) ? ((v) & 0x7fffffff) : (v)); \
+	(__force t)(__TYPE_IS_PTR(t) ? ((v) & 0x7fffffff) : (v)); \
 })
 
 #define PSW32_MASK_PER		0x40000000UL
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 5a6a109b4a50..e5d3fbe24f7d 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -27,7 +27,7 @@
 #endif
 
 #ifndef __SC_DELOUSE
-#define __SC_DELOUSE(t,v) ((t)(unsigned long)(v))
+#define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
 #endif
 
 #define COMPAT_SYSCALL_DEFINE0(name) \
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 3cb15ea48aee..0bc1d2e8cc17 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -100,11 +100,12 @@ union bpf_attr;
 #define __MAP(n,...) __MAP##n(__VA_ARGS__)
 
 #define __SC_DECL(t, a)	t a
-#define __TYPE_IS_L(t)	(__same_type((t)0, 0L))
-#define __TYPE_IS_UL(t)	(__same_type((t)0, 0UL))
-#define __TYPE_IS_LL(t) (__same_type((t)0, 0LL) || __same_type((t)0, 0ULL))
+#define __TYPE_AS(t, v)	__same_type((__force t)0, v)
+#define __TYPE_IS_L(t)	(__TYPE_AS(t, 0L))
+#define __TYPE_IS_UL(t)	(__TYPE_AS(t, 0UL))
+#define __TYPE_IS_LL(t) (__TYPE_AS(t, 0LL) || __TYPE_AS(t, 0ULL))
 #define __SC_LONG(t, a) __typeof(__builtin_choose_expr(__TYPE_IS_LL(t), 0LL, 0L)) a
-#define __SC_CAST(t, a)	(t) a
+#define __SC_CAST(t, a)	(__force t) a
 #define __SC_ARGS(t, a)	a
 #define __SC_TEST(t, a) (void)BUILD_BUG_ON_ZERO(!__TYPE_IS_LL(t) && sizeof(t) > sizeof(long))