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Commit c3fc5cd5 authored by Ralf Baechle's avatar Ralf Baechle
Browse files

MIPS: Implement HAVE_CONTEXT_TRACKING. 



This enables support for CONFIG_NO_HZ_FULL.

Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent e7f3b48a

arch/mips/Kconfig

+1 −0
Original line number Diff line number Diff line 
config MIPS

	bool

	default y

	select HAVE_CONTEXT_TRACKING

	select HAVE_GENERIC_DMA_COHERENT

	select HAVE_IDE

	select HAVE_OPROFILE

arch/mips/include/asm/thread_info.h

+8 −3
Original line number Diff line number Diff line
@@ -109,6 +109,7 @@ static inline struct thread_info *current_thread_info(void) 
#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */

#define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */

#define TIF_MEMDIE		18	/* is terminating due to OOM killer */

#define TIF_NOHZ		19	/* in adaptive nohz mode */

#define TIF_FIXADE		20	/* Fix address errors in software */

#define TIF_LOGADE		21	/* Log address errors to syslog */

#define TIF_32BIT_REGS		22	/* also implies 16/32 fprs */
@@ -124,6 +125,7 @@ static inline struct thread_info *current_thread_info(void) 
#define _TIF_SECCOMP		(1<<TIF_SECCOMP)

#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)

#define _TIF_USEDFPU		(1<<TIF_USEDFPU)

#define _TIF_NOHZ		(1<<TIF_NOHZ)

#define _TIF_FIXADE		(1<<TIF_FIXADE)

#define _TIF_LOGADE		(1<<TIF_LOGADE)

#define _TIF_32BIT_REGS		(1<<TIF_32BIT_REGS)
@@ -131,16 +133,19 @@ static inline struct thread_info *current_thread_info(void) 
#define _TIF_FPUBOUND		(1<<TIF_FPUBOUND)

#define _TIF_LOAD_WATCH		(1<<TIF_LOAD_WATCH)



#define _TIF_WORK_SYSCALL_ENTRY	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT)

#define _TIF_WORK_SYSCALL_ENTRY	(_TIF_NOHZ | _TIF_SYSCALL_TRACE |	\

				 _TIF_SYSCALL_AUDIT)



/* work to do in syscall_trace_leave() */

#define _TIF_WORK_SYSCALL_EXIT	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT)

#define _TIF_WORK_SYSCALL_EXIT	(_TIF_NOHZ | _TIF_SYSCALL_TRACE |	\

				 _TIF_SYSCALL_AUDIT)



/* work to do on interrupt/exception return */

#define _TIF_WORK_MASK		\

	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)

/* work to do on any return to u-space */

#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK | _TIF_WORK_SYSCALL_EXIT)

#define _TIF_ALLWORK_MASK	(_TIF_NOHZ | _TIF_WORK_MASK |		\

				 _TIF_WORK_SYSCALL_EXIT)



#endif /* __KERNEL__ */

arch/mips/kernel/cpu-bugs64.c

+5 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 */

#include <linux/context_tracking.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/ptrace.h>
@@ -171,8 +172,12 @@ static volatile int daddi_ov __cpuinitdata; 


asmlinkage void __init do_daddi_ov(struct pt_regs *regs)

{

	enum ctx_state prev_state;



	prev_state = exception_enter();

	daddi_ov = 1;

	regs->cp0_epc += 4;

	exception_exit(prev_state);

}



static inline void check_daddi(void)

arch/mips/kernel/ptrace.c

+12 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
 * binaries.

 */

#include <linux/compiler.h>

#include <linux/context_tracking.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/mm.h>
@@ -534,6 +535,8 @@ static inline int audit_arch(void) 
 */

asmlinkage void syscall_trace_enter(struct pt_regs *regs)

{

	user_exit();



	/* do the secure computing check first */

	secure_computing_strict(regs->regs[2]);
@@ -570,6 +573,13 @@ out: 
 */

asmlinkage void syscall_trace_leave(struct pt_regs *regs)

{

        /*

	 * We may come here right after calling schedule_user()

	 * or do_notify_resume(), in which case we can be in RCU

	 * user mode.

	 */

	user_exit();



	audit_syscall_exit(regs);



	if (!(current->ptrace & PT_PTRACED))
@@ -592,4 +602,6 @@ asmlinkage void syscall_trace_leave(struct pt_regs *regs) 
		send_sig(current->exit_code, current, 1);

		current->exit_code = 0;

	}



	user_enter();

}

arch/mips/kernel/signal.c

+5 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.

 */

#include <linux/cache.h>

#include <linux/context_tracking.h>

#include <linux/irqflags.h>

#include <linux/sched.h>

#include <linux/mm.h>
@@ -573,6 +574,8 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, 
{

	local_irq_enable();



	user_exit();



	/* deal with pending signal delivery */

	if (thread_info_flags & _TIF_SIGPENDING)

		do_signal(regs);
@@ -581,6 +584,8 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, 
		clear_thread_flag(TIF_NOTIFY_RESUME);

		tracehook_notify_resume(regs);

	}



	user_enter();

}



#ifdef CONFIG_SMP