ARC: Fixes to enable building with 3.5 tip

-Nuke TIF_FREEZE
-Nuke PTRACE_O_TRACESYSGOOD
-Add __kernel_long_t, __kernel_ulong_t

-Use sigsuspend() helper in sys_{rt_}sigsuspend
 (68f3f16, "new helper: sigsuspend()")

-Use set_current_blocked()/block_sigmask() helpers
 (7ebe0c5, "frv: use set_current_blocked() and block_sigmask()")

-Use signal_delivered() instead of block_sigmask()
(efee984, "new helper: signal_delivered()")

-tick_nohz_{stop,restart}_sched_tick => tick_nohz_idle_{enter,exit}
 (280f067, "nohz: Separate out irq exit and idle loop dyntick logic")

-Nuke init_task.c
 (a4a2eb4, "init_task: Create generic init_task instance")

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/Makefile

@@ -82,7 +82,7 @@ KBUILD_LDFLAGS	+= $(ldflags-y)
 # Needed for Linker script preprocessing
 KBUILD_CPPFLAGS	+= -Iarch/arc/plat-$(PLATFORM)/include
 
-head-y		:= arch/arc/kernel/head.o arch/arc/kernel/init_task.o
+head-y		:= arch/arc/kernel/head.o
 
 # See arch/arc/Kbuild for content of core part of the kernel
 core-y				+= arch/arc/

arch/arc/include/asm/posix_types.h

@@ -10,6 +10,8 @@
 #define _ASM_ARC_POSIX_TYPES_H
 
 /* XXX: Subtle differences in asm-generic ver - need to chk before switch */
+typedef long __kernel_long_t;
+typedef unsigned long __kernel_ulong_t;
 typedef unsigned long __kernel_ino_t;
 typedef unsigned short __kernel_mode_t;
 typedef unsigned short __kernel_nlink_t;

arch/arc/include/asm/ptrace.h

@@ -106,8 +106,6 @@ struct callee_regs {
 #define PTRACE_GETFPREGS	14
 #define PTRACE_SETFPREGS	15
 
-#define PTRACE_O_TRACESYSGOOD     0x00000001
-
 #define instruction_pointer(regs)	((regs)->ret)
 #define profile_pc(regs)		instruction_pointer(regs)
 

arch/arc/include/asm/thread_info.h

@@ -100,7 +100,6 @@ static inline __attribute_const__ struct thread_info *current_thread_info(void)
 /* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_POLLING_NRFLAG	17
 #define TIF_MEMDIE		18
-#define TIF_FREEZE		19
 #define TIF_SYSCALL_TRACE	31	/* syscall trace active */
 
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
@@ -112,7 +111,6 @@ static inline __attribute_const__ struct thread_info *current_thread_info(void)
 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
-#define _TIF_FREEZE		(1<<TIF_FREEZE)
 
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK      (0x0000ffef & ~_TIF_SECCOMP)

arch/arc/kernel/Makefile

@@ -31,4 +31,4 @@ else
 obj-y += ctx_sw_asm.o
 endif
 
-extra-y := init_task.o vmlinux.lds head.o
+extra-y := vmlinux.lds head.o

arch/arc/kernel/process.c

@@ -75,7 +75,7 @@ void cpu_idle(void)
 
 	/* endless idle loop with no priority at all */
 	while (1) {
-		tick_nohz_stop_sched_tick(1);
+		tick_nohz_idle_enter();
 
 		/* Test the need-resced "flag" of current task "idle"
 		   A local ISR or peer CPU may want resched
@@ -85,7 +85,7 @@ void cpu_idle(void)
 		while (!need_resched())
 			arch_idle();
 
-		tick_nohz_restart_sched_tick();
+		tick_nohz_idle_exit();
 
 		preempt_enable_no_resched();
 		schedule();

arch/arc/kernel/signal.c

@@ -83,19 +83,9 @@ static noinline void set_frame_exec(unsigned long vaddr, unsigned int exec_on);
 asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask,
 			      old_sigset_t mask)
 {
-	sigset_t saveset;
-
-	mask &= _BLOCKABLE;
-	spin_lock_irq(&current->sighand->siglock);
-	saveset = current->blocked;
-	siginitset(&current->blocked, mask);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-
-	current->state = TASK_INTERRUPTIBLE;
-	schedule();
-	set_thread_flag(TIF_RESTORE_SIGMASK);
-	return -ERESTARTNOHAND;
+       sigset_t blocked;
+       siginitset(&blocked, mask);
+       return sigsuspend(&blocked);
 }
 
 asmlinkage int
@@ -169,10 +159,7 @@ static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf)
 	err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
 	if (err == 0) {
 		sigdelsetmask(&set, ~_BLOCKABLE);
-		spin_lock_irq(&current->sighand->siglock);
-		current->blocked = set;
-		recalc_sigpending();
-		spin_unlock_irq(&current->sighand->siglock);
+		set_current_blocked(&set);
 	}
 
 	{
@@ -553,13 +540,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
 		return ret;
 	}
 
-	/* Block the signal if we are successful */
-	spin_lock_irq(&current->sighand->siglock);
-	sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
-	if (!(ka->sa.sa_flags & SA_NODEFER))
-		sigaddset(&current->blocked, sig);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	signal_delivered(sig, info, ka, regs, 0);
 
 	return ret;
 }