arm64: switch compat to generic old sigsuspend

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

arch/arm64/Kconfig

@@ -208,6 +208,7 @@ config COMPAT
 	depends on !ARM64_64K_PAGES
 	select COMPAT_BINFMT_ELF
 	select HAVE_UID16
+	select OLD_SIGSUSPEND3
 	help
 	  This option enables support for a 32-bit EL0 running under a 64-bit
 	  kernel at EL1. AArch32-specific components such as system calls,

arch/arm64/include/asm/unistd32.h

@@ -93,7 +93,7 @@ __SYSCALL(68,  sys_ni_syscall)			/* 68 was sys_sgetmask */
 __SYSCALL(69,  sys_ni_syscall)			/* 69 was sys_ssetmask */
 __SYSCALL(70,  sys_setreuid16)
 __SYSCALL(71,  sys_setregid16)
-__SYSCALL(72,  compat_sys_sigsuspend)
+__SYSCALL(72,  sys_sigsuspend)
 __SYSCALL(73,  compat_sys_sigpending)
 __SYSCALL(74,  sys_sethostname)
 __SYSCALL(75,  compat_sys_setrlimit)

arch/arm64/kernel/signal32.c

@@ -333,18 +333,6 @@ static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame)
 	return err ? -EFAULT : 0;
 }
 
-/*
- * atomically swap in the new signal mask, and wait for a signal.
- */
-asmlinkage int compat_sys_sigsuspend(int restart, compat_ulong_t oldmask,
-				     compat_old_sigset_t mask)
-{
-	sigset_t blocked;
-
-	siginitset(&current->blocked, mask);
-	return sigsuspend(&blocked);
-}
-
 asmlinkage int compat_sys_sigaction(int sig,
 				    const struct compat_old_sigaction __user *act,
 				    struct compat_old_sigaction __user *oact)