Revert "MIPS: UAPI: Fix unrecognized opcode WSBH/DSBH/DSHD when using MIPS16."

This reverts commit e0d8b2ec532852d4b5aabcec3e7611848c32237d.

For at least GCC 4.8.3, adding nomips16 function attribute still cannot
prevent it from being inlined in mips16 context.  So revert it first in
preparation for a better workaround.

 [1] Inlining nomips16 function into mips16 function can result in
     undefined builtins, https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55777

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11240/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/uapi/asm/swab.h

@@ -16,13 +16,11 @@
 #if (defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) ||		\
     defined(_MIPS_ARCH_LOONGSON3A)
 
-static inline __attribute__((nomips16)) __attribute_const__
-		__u16 __arch_swab16(__u16 x)
+static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
 {
 	__asm__(
 	"	.set	push			\n"
 	"	.set	arch=mips32r2		\n"
-	"	.set	nomips16		\n"
 	"	wsbh	%0, %1			\n"
 	"	.set	pop			\n"
 	: "=r" (x)
@@ -32,13 +30,11 @@ static inline __attribute__((nomips16)) __attribute_const__
 }
 #define __arch_swab16 __arch_swab16
 
-static inline __attribute__((nomips16)) __attribute_const__
-		__u32 __arch_swab32(__u32 x)
+static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
 {
 	__asm__(
 	"	.set	push			\n"
 	"	.set	arch=mips32r2		\n"
-	"	.set	nomips16		\n"
 	"	wsbh	%0, %1			\n"
 	"	rotr	%0, %0, 16		\n"
 	"	.set	pop			\n"
@@ -54,13 +50,11 @@ static inline __attribute__((nomips16)) __attribute_const__
  * 64-bit kernel on r2 CPUs.
  */
 #ifdef __mips64
-static inline __attribute__((nomips16)) __attribute_const__
-		__u64 __arch_swab64(__u64 x)
+static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
 {
 	__asm__(
 	"	.set	push			\n"
 	"	.set	arch=mips64r2		\n"
-	"	.set	nomips16		\n"
 	"	dsbh	%0, %1			\n"
 	"	dshd	%0, %0			\n"
 	"	.set	pop			\n"