From: Paul Mundt <lethal@linux-sh.org>
Date: Tue, 8 Dec 2009 06:47:12 +0000 (+0900)
Subject: Merge branch 'master' into sh/hw-breakpoints
X-Git-Tag: v2.6.34-rc1~285^2~136^3~12
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6424db52e24e8cdf89917fa3c10395116440160e;p=profile%2Fivi%2Fkernel-x86-ivi.git

Merge branch 'master' into sh/hw-breakpoints

Conflict between FPU thread flag migration and debug
thread flag addition.

Conflicts:
	arch/sh/include/asm/thread_info.h
	arch/sh/include/asm/ubc.h
	arch/sh/kernel/process_32.c
---

6424db52e24e8cdf89917fa3c10395116440160e
diff --cc arch/sh/Kconfig
index d563884,0031a69..185e9af
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@@ -37,9 -39,9 +39,10 @@@ config SUPERH3
  	select HAVE_FTRACE_MCOUNT_RECORD
  	select HAVE_DYNAMIC_FTRACE
  	select HAVE_FUNCTION_TRACE_MCOUNT_TEST
+ 	select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE
  	select HAVE_FUNCTION_GRAPH_TRACER
  	select HAVE_ARCH_KGDB
 +	select HAVE_HW_BREAKPOINT if CPU_SH4A
  	select ARCH_HIBERNATION_POSSIBLE if MMU
  
  config SUPERH64
diff --cc arch/sh/include/asm/thread_info.h
index 8ab9145,1f3d927..e0856b2
--- a/arch/sh/include/asm/thread_info.h
+++ b/arch/sh/include/asm/thread_info.h
@@@ -117,8 -118,6 +118,7 @@@ extern void free_thread_info(struct thr
  #define TIF_SECCOMP		6	/* secure computing */
  #define TIF_NOTIFY_RESUME	7	/* callback before returning to user */
  #define TIF_SYSCALL_TRACEPOINT	8	/* for ftrace syscall instrumentation */
 +#define TIF_DEBUG		9	/* uses UBC */
- #define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
  #define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
  #define TIF_MEMDIE		18
  #define TIF_FREEZE		19	/* Freezing for suspend */
@@@ -132,8 -130,6 +131,7 @@@
  #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
  #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
  #define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
 +#define _TIF_DEBUG		(1 << TIF_DEBUG)
- #define _TIF_USEDFPU		(1 << TIF_USEDFPU)
  #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
  #define _TIF_FREEZE		(1 << TIF_FREEZE)
  
diff --cc arch/sh/include/asm/ubc.h
index dd78781,9bf9616..e3c2968
--- a/arch/sh/include/asm/ubc.h
+++ b/arch/sh/include/asm/ubc.h
@@@ -60,22 -60,5 +60,11 @@@
  #define BRCR_UBDE		(1 << 0)
  #endif
  
 +/*
 + * All SH parts have 2 UBC channels. I defy any hardware designer to
 + * invalidate this assertion.
 + */
 +#define NR_UBC_CHANNELS		2
 +
- #ifndef __ASSEMBLY__
- /* arch/sh/kernel/cpu/ubc.S */
- extern void ubc_sleep(void);
- 
- #ifdef CONFIG_UBC_WAKEUP
- extern void ubc_wakeup(void);
- #else
- #define ubc_wakeup()	do { } while (0)
- #endif
- #endif
- 
  #endif /* __KERNEL__ */
  #endif /* __ASM_SH_UBC_H */
diff --cc arch/sh/kernel/Makefile
index 649daad,0471a3e..cd43877
--- a/arch/sh/kernel/Makefile
+++ b/arch/sh/kernel/Makefile
@@@ -35,8 -38,8 +38,9 @@@ obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += 
  obj-$(CONFIG_DUMP_CODE)		+= disassemble.o
  obj-$(CONFIG_HIBERNATION)	+= swsusp.o
  obj-$(CONFIG_DWARF_UNWINDER)	+= dwarf.o
+ obj-$(CONFIG_PERF_EVENTS)	+= perf_event.o perf_callchain.o
  
 +obj-$(CONFIG_HAVE_HW_BREAKPOINT)		+= hw_breakpoint.o
  obj-$(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)	+= localtimer.o
  
  EXTRA_CFLAGS += -Werror
diff --cc arch/sh/kernel/process_32.c
index 4a2c866,d8af889..7399d78
--- a/arch/sh/kernel/process_32.c
+++ b/arch/sh/kernel/process_32.c
@@@ -193,15 -209,11 +207,10 @@@ int copy_thread(unsigned long clone_fla
  {
  	struct thread_info *ti = task_thread_info(p);
  	struct pt_regs *childregs;
- 	struct task_struct *tsk = current;
- 
- #if defined(CONFIG_SH_FPU)
- 	unlazy_fpu(tsk, regs);
- 	p->thread.fpu = tsk->thread.fpu;
- 	copy_to_stopped_child_used_math(p);
- #endif
 +
  #if defined(CONFIG_SH_DSP)
+ 	struct task_struct *tsk = current;
 -#endif
+ 
 -#if defined(CONFIG_SH_DSP)
  	if (is_dsp_enabled(tsk)) {
  		/* We can use the __save_dsp or just copy the struct:
  		 * __save_dsp(p);
@@@ -256,6 -316,33 +271,14 @@@ __switch_to(struct task_struct *prev, s
  		     : "r" (task_thread_info(next)));
  #endif
  
 -	/* If no tasks are using the UBC, we're done */
 -	if (ubc_usercnt == 0)
 -		/* If no tasks are using the UBC, we're done */;
 -	else if (next->thread.ubc_pc && next->mm) {
 -		int asid = 0;
 -#ifdef CONFIG_MMU
 -		asid |= cpu_asid(smp_processor_id(), next->mm);
 -#endif
 -		ubc_set_tracing(asid, next->thread.ubc_pc);
 -	} else {
 -#if defined(CONFIG_CPU_SH4A)
 -		ctrl_outl(UBC_CBR_INIT, UBC_CBR0);
 -		ctrl_outl(UBC_CRR_INIT, UBC_CRR0);
 -#else
 -		ctrl_outw(0, UBC_BBRA);
 -		ctrl_outw(0, UBC_BBRB);
 -#endif
 -	}
 -
+ 	/*
+ 	 * If the task has used fpu the last 5 timeslices, just do a full
+ 	 * restore of the math state immediately to avoid the trap; the
+ 	 * chances of needing FPU soon are obviously high now
+ 	 */
+ 	if (next->fpu_counter > 5)
+ 		fpu_state_restore(task_pt_regs(next));
+ 
  	return prev;
  }