Merge tag 'uaccess_for_upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost into asm-generic

Merge "uaccess: fix sparse warning on get/put_user for bitwise types" from Michael S. Tsirkin:

At the moment, if p and x are both tagged as bitwise types,
some of get_user(x, p), put_user(x, p), __get_user(x, p), __put_user(x, p)
might produce a sparse warning on many architectures.
This is a false positive: *p on these architectures is loaded into long
(typically using asm), then cast back to typeof(*p).

When typeof(*p) is a bitwise type (which is uncommon), such a cast needs
__force, otherwise sparse produces a warning.

Some architectures already have the __force tag, add it
where it's missing.

I verified that adding these __force casts does not supress any useful warnings.

Specifically, vhost wants to read/write bitwise types in userspace memory
using get_user/put_user.
At the moment this triggers sparse errors, since the value is passed through an
integer.

For example:
    __le32 __user *p;
    __u32 x;

both
    put_user(x, p);
and
    get_user(x, p);
should be safe, but produce warnings on some architectures.

While there, I noticed that a bunch of architectures violated
coding style rules within uaccess macros.
Included patches to fix them up.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

* tag 'uaccess_for_upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (37 commits)
  sparc32: nocheck uaccess coding style tweaks
  sparc64: nocheck uaccess coding style tweaks
  xtensa: macro whitespace fixes
  sh: macro whitespace fixes
  parisc: macro whitespace fixes
  m68k: macro whitespace fixes
  m32r: macro whitespace fixes
  frv: macro whitespace fixes
  cris: macro whitespace fixes
  avr32: macro whitespace fixes
  arm64: macro whitespace fixes
  arm: macro whitespace fixes
  alpha: macro whitespace fixes
  blackfin: macro whitespace fixes
  sparc64: uaccess_64 macro whitespace fixes
  sparc32: uaccess_32 macro whitespace fixes
  avr32: whitespace fix
  sh: fix put_user sparse errors
  metag: fix put_user sparse errors
  ia64: fix put_user sparse errors
  ...

2 files changed, 21 insertions, 21 deletions

diff --git a/arch/m68k/include/asm/segment.h b/arch/m68k/include/asm/segment.h
index 0fa80e97ed2d..98216b8111f0 100644
--- a/arch/m68k/include/asm/segment.h
+++ b/arch/m68k/include/asm/segment.h
@@ -58,7 +58,7 @@ static inline mm_segment_t get_ds(void)
 #define set_fs(x)	(current_thread_info()->addr_limit = (x))
 #endif
 
-#define segment_eq(a,b)	((a).seg == (b).seg)
+#define segment_eq(a, b) ((a).seg == (b).seg)
 
 #endif /* __ASSEMBLY__ */
 
diff --git a/arch/m68k/include/asm/uaccess_mm.h b/arch/m68k/include/asm/uaccess_mm.h
index 15901db435b9..d228601b3afc 100644
--- a/arch/m68k/include/asm/uaccess_mm.h
+++ b/arch/m68k/include/asm/uaccess_mm.h
@@ -128,25 +128,25 @@ asm volatile ("\n"					\
 #define put_user(x, ptr)	__put_user(x, ptr)
 
 
-#define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({	\
-	type __gu_val;						\
-	asm volatile ("\n"					\
-		"1:	"MOVES"."#bwl"	%2,%1\n"		\
-		"2:\n"						\
-		"	.section .fixup,\"ax\"\n"		\
-		"	.even\n"				\
-		"10:	move.l	%3,%0\n"			\
-		"	sub.l	%1,%1\n"			\
-		"	jra	2b\n"				\
-		"	.previous\n"				\
-		"\n"						\
-		"	.section __ex_table,\"a\"\n"		\
-		"	.align	4\n"				\
-		"	.long	1b,10b\n"			\
-		"	.previous"				\
-		: "+d" (res), "=&" #reg (__gu_val)		\
-		: "m" (*(ptr)), "i" (err));			\
-	(x) = (typeof(*(ptr)))(unsigned long)__gu_val;		\
+#define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({		\
+	type __gu_val;							\
+	asm volatile ("\n"						\
+		"1:	"MOVES"."#bwl"	%2,%1\n"			\
+		"2:\n"							\
+		"	.section .fixup,\"ax\"\n"			\
+		"	.even\n"					\
+		"10:	move.l	%3,%0\n"				\
+		"	sub.l	%1,%1\n"				\
+		"	jra	2b\n"					\
+		"	.previous\n"					\
+		"\n"							\
+		"	.section __ex_table,\"a\"\n"			\
+		"	.align	4\n"					\
+		"	.long	1b,10b\n"				\
+		"	.previous"					\
+		: "+d" (res), "=&" #reg (__gu_val)			\
+		: "m" (*(ptr)), "i" (err));				\
+	(x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val;	\
 })
 
 #define __get_user(x, ptr)						\
@@ -188,7 +188,7 @@ asm volatile ("\n"					\
 			  "+a" (__gu_ptr)				\
 			: "i" (-EFAULT)					\
 			: "memory");					\
-		(x) = (typeof(*(ptr)))__gu_val;				\
+		(x) = (__force typeof(*(ptr)))__gu_val;			\
 		break;							\
 	    }	*/							\
 	default:							\