compel/uapi: remove compat_sigset_t type

Remove compatible sigset structure: as it has the same size for both
32-bit and 64-bit, I didn't use it across the code, only for a size check.
The check is removed as we use now only k_rtsigset_t.
Wordsize for sigset is changed to 64-bit - as it's written in comment
for possible 32-bit native building.

If we ever going to support compat mode for other archs, we will
need to re-introduce compat_sigset_t type if it has for those archs
different sizes for compat/native builds.
But for a while, let's simplify this.

travis-ci: success for Compel/compat cleanups
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

compel/arch/x86/plugins/include/asm/syscall-types.h

@@ -11,17 +11,17 @@ typedef rt_restorefn_t *rt_sigrestore_t;
 #define SA_RESTORER	0x04000000
 
 #define _KNSIG		64
-
-#ifndef CONFIG_COMPAT
 #define _NSIG_BPW	64
-#else
-#define _NSIG_BPW	32
-#endif
 
 #define _KNSIG_WORDS	(_KNSIG / _NSIG_BPW)
 
+/*
+ * Note: as k_rtsigset_t is the same size for 32-bit and 64-bit,
+ * sig defined as uint64_t rather than (unsigned long) - for the
+ * purpose if we ever going to support native 32-bit compilation.
+ */
 typedef struct {
-	unsigned long	sig[_KNSIG_WORDS];
+	uint64_t	sig[_KNSIG_WORDS];
 } k_rtsigset_t;
 
 typedef struct {

compel/arch/x86/src/lib/include/uapi/asm/sigframe.h

@@ -73,17 +73,8 @@ struct rt_sigcontext_32 {
  *      when (if) other architectures will support compatible C/R
  */
 
-typedef u32			compat_uptr_t;
-typedef u32			compat_size_t;
-typedef u32			compat_sigset_word;
-
-#define _COMPAT_NSIG		64
-#define _COMPAT_NSIG_BPW	32
-#define _COMPAT_NSIG_WORDS	(_COMPAT_NSIG / _COMPAT_NSIG_BPW)
-
-typedef struct {
-	compat_sigset_word	sig[_COMPAT_NSIG_WORDS];
-} compat_sigset_t;
+typedef uint32_t			compat_uptr_t;
+typedef uint32_t			compat_size_t;
 
 typedef struct compat_siginfo {
 	int	si_signo;
@@ -92,11 +83,6 @@ typedef struct compat_siginfo {
 	int	_pad[128/sizeof(int) - 3];
 } compat_siginfo_t;
 
-static inline void __always_unused __check_compat_sigset_t(void)
-{
-	BUILD_BUG_ON(sizeof(compat_sigset_t) != sizeof(k_rtsigset_t));
-}
-
 #ifdef CONFIG_X86_32
 #define rt_sigframe_ia32		rt_sigframe
 #endif