Re: [PATCH 1/6] Container Freezer: Add TIF_FREEZE flag to all architectures

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Hi.

On Thu, 2008-07-31 at 22:07 -0700, Matt Helsley wrote:
> This patch is the first step in making the refrigerator() available
> to all architectures, even for those without power management.
> 
> The purpose of such a change is to be able to use the refrigerator()
> in a new control group subsystem which will implement a control group
> freezer.

Is there a reason for always using 19, rather than just the next
available bit?

Regards,

Nigel

> Signed-off-by: Cedric Le Goater <clg@xxxxxxxxxx>
> Signed-off-by: Matt Helsley <matthltc@xxxxxxxxxx>
> Acked-by: Pavel Machek <pavel@xxxxxxx>
> Acked-by: Serge E. Hallyn <serue@xxxxxxxxxx>
> Tested-by: Matt Helsley <matthltc@xxxxxxxxxx>
> ---
>  arch/parisc/include/asm/thread_info.h   |    2 ++
>  arch/sparc/include/asm/thread_info_32.h |    2 ++
>  arch/sparc/include/asm/thread_info_64.h |    2 ++
>  include/asm-alpha/thread_info.h         |    2 ++
>  include/asm-avr32/thread_info.h         |    1 +
>  include/asm-cris/thread_info.h          |    2 ++
>  include/asm-h8300/thread_info.h         |    2 ++
>  include/asm-m68k/thread_info.h          |    1 +
>  include/asm-m68knommu/thread_info.h     |    2 ++
>  include/asm-s390/thread_info.h          |    2 ++
>  include/asm-um/thread_info.h            |    2 ++
>  include/asm-xtensa/thread_info.h        |    2 ++
>  12 files changed, 22 insertions(+)
> 
> Index: linux-2.6.27-rc1-mm1/arch/sparc/include/asm/thread_info_32.h
> ===================================================================
> --- linux-2.6.27-rc1-mm1.orig/arch/sparc/include/asm/thread_info_32.h
> +++ linux-2.6.27-rc1-mm1/arch/sparc/include/asm/thread_info_32.h
> @@ -137,10 +137,11 @@ BTFIXUPDEF_CALL(void, free_thread_info, 
>  #define TIF_USEDFPU		8	/* FPU was used by this task
>  					 * this quantum (SMP) */
>  #define TIF_POLLING_NRFLAG	9	/* true if poll_idle() is polling
>  					 * TIF_NEED_RESCHED */
>  #define TIF_MEMDIE		10
> +#define TIF_FREEZE		19	/* is freezing for suspend */
>  
>  /* as above, but as bit values */
>  #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
>  #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
>  #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
> @@ -150,9 +151,10 @@ BTFIXUPDEF_CALL(void, free_thread_info, 
>  #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
>  
>  #define _TIF_DO_NOTIFY_RESUME_MASK	(_TIF_NOTIFY_RESUME | \
>  					 _TIF_SIGPENDING | \
>  					 _TIF_RESTORE_SIGMASK)
> +#define TIF_FREEZE		(1<<TIF_FREEZE)
>  
>  #endif /* __KERNEL__ */
>  
>  #endif /* _ASM_THREAD_INFO_H */
> Index: linux-2.6.27-rc1-mm1/arch/sparc/include/asm/thread_info_64.h
> ===================================================================
> --- linux-2.6.27-rc1-mm1.orig/arch/sparc/include/asm/thread_info_64.h
> +++ linux-2.6.27-rc1-mm1/arch/sparc/include/asm/thread_info_64.h
> @@ -235,10 +235,11 @@ register struct thread_info *current_thr
>   *       an immediate value in instructions such as andcc.
>   */
>  #define TIF_ABI_PENDING		12
>  #define TIF_MEMDIE		13
>  #define TIF_POLLING_NRFLAG	14
> +#define TIF_FREEZE		19	/* is freezing for suspend */
>  
>  #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
>  #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
>  #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
>  #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
> @@ -247,10 +248,11 @@ register struct thread_info *current_thr
>  #define _TIF_32BIT		(1<<TIF_32BIT)
>  #define _TIF_SECCOMP		(1<<TIF_SECCOMP)
>  #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
>  #define _TIF_ABI_PENDING	(1<<TIF_ABI_PENDING)
>  #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
> +#define _TIF_FREEZE		(1<<TIF_FREEZE)
>  
>  #define _TIF_USER_WORK_MASK	((0xff << TI_FLAG_WSAVED_SHIFT) | \
>  				 _TIF_DO_NOTIFY_RESUME_MASK | \
>  				 _TIF_NEED_RESCHED | _TIF_PERFCTR)
>  #define _TIF_DO_NOTIFY_RESUME_MASK	(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
> Index: linux-2.6.27-rc1-mm1/include/asm-alpha/thread_info.h
> ===================================================================
> --- linux-2.6.27-rc1-mm1.orig/include/asm-alpha/thread_info.h
> +++ linux-2.6.27-rc1-mm1/include/asm-alpha/thread_info.h
> @@ -72,16 +72,18 @@ register struct thread_info *__current_t
>  #define TIF_UAC_NOPRINT		5	/* see sysinfo.h */
>  #define TIF_UAC_NOFIX		6
>  #define TIF_UAC_SIGBUS		7
>  #define TIF_MEMDIE		8
>  #define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal */
> +#define TIF_FREEZE		19	/* is freezing for suspend */
>  
>  #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
>  #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
>  #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
>  #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
>  #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
> +#define _TIF_FREEZE		(1<<TIF_FREEZE)
>  
>  /* Work to do on interrupt/exception return.  */
>  #define _TIF_WORK_MASK		(_TIF_SIGPENDING | _TIF_NEED_RESCHED)
>  
>  /* Work to do on any return to userspace.  */
> Index: linux-2.6.27-rc1-mm1/include/asm-avr32/thread_info.h
> ===================================================================
> --- linux-2.6.27-rc1-mm1.orig/include/asm-avr32/thread_info.h
> +++ linux-2.6.27-rc1-mm1/include/asm-avr32/thread_info.h
> @@ -94,10 +94,11 @@ static inline struct thread_info *curren
>  #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
>  #define _TIF_SINGLE_STEP	(1 << TIF_SINGLE_STEP)
>  #define _TIF_MEMDIE		(1 << TIF_MEMDIE)
>  #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
>  #define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
> +#define _TIF_FREEZE		(1 << TIF_FREEZE)
>  
>  /* Note: The masks below must never span more than 16 bits! */
>  
>  /* work to do on interrupt/exception return */
>  #define _TIF_WORK_MASK				\
> Index: linux-2.6.27-rc1-mm1/include/asm-cris/thread_info.h
> ===================================================================
> --- linux-2.6.27-rc1-mm1.orig/include/asm-cris/thread_info.h
> +++ linux-2.6.27-rc1-mm1/include/asm-cris/thread_info.h
> @@ -86,17 +86,19 @@ struct thread_info {
>  #define TIF_SIGPENDING		2	/* signal pending */
>  #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
>  #define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
>  #define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
>  #define TIF_MEMDIE		17
> +#define TIF_FREEZE		19	/* is freezing for suspend */
>  
>  #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
>  #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
>  #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
>  #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
>  #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
>  #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
> +#define _TIF_FREEZE		(1<<TIF_FREEZE)
>  
>  #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
>  #define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
>  
>  #endif /* __KERNEL__ */
> Index: linux-2.6.27-rc1-mm1/include/asm-h8300/thread_info.h
> ===================================================================
> --- linux-2.6.27-rc1-mm1.orig/include/asm-h8300/thread_info.h
> +++ linux-2.6.27-rc1-mm1/include/asm-h8300/thread_info.h
> @@ -87,17 +87,19 @@ static inline struct thread_info *curren
>  #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
>  #define TIF_POLLING_NRFLAG	3	/* true if poll_idle() is polling
>  					   TIF_NEED_RESCHED */
>  #define TIF_MEMDIE		4
>  #define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
> +#define TIF_FREEZE		19	/* is freezing for suspend */
>  
>  /* as above, but as bit values */
>  #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
>  #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
>  #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
>  #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
>  #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
> +#define _TIF_FREEZE		(1<<TIF_FREEZE)
>  
>  #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
>  
>  #endif /* __KERNEL__ */
>  
> Index: linux-2.6.27-rc1-mm1/include/asm-m68k/thread_info.h
> ===================================================================
> --- linux-2.6.27-rc1-mm1.orig/include/asm-m68k/thread_info.h
> +++ linux-2.6.27-rc1-mm1/include/asm-m68k/thread_info.h
> @@ -50,7 +50,8 @@ struct thread_info {
>  #define TIF_SIGPENDING		6	/* signal pending */
>  #define TIF_NEED_RESCHED	7	/* rescheduling necessary */
>  #define TIF_DELAYED_TRACE	14	/* single step a syscall */
>  #define TIF_SYSCALL_TRACE	15	/* syscall trace active */
>  #define TIF_MEMDIE		16
> +#define TIF_FREEZE		19	/* thread is freezing for suspend */
>  
>  #endif	/* _ASM_M68K_THREAD_INFO_H */
> Index: linux-2.6.27-rc1-mm1/include/asm-m68knommu/thread_info.h
> ===================================================================
> --- linux-2.6.27-rc1-mm1.orig/include/asm-m68knommu/thread_info.h
> +++ linux-2.6.27-rc1-mm1/include/asm-m68knommu/thread_info.h
> @@ -82,16 +82,18 @@ static inline struct thread_info *curren
>  #define TIF_SIGPENDING		1	/* signal pending */
>  #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
>  #define TIF_POLLING_NRFLAG	3	/* true if poll_idle() is polling
>  					   TIF_NEED_RESCHED */
>  #define TIF_MEMDIE		4
> +#define TIF_FREEZE		19	/* is freezing for suspend */
>  
>  /* as above, but as bit values */
>  #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
>  #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
>  #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
>  #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
> +#define _TIF_FREEZE		(1<<TIF_FREEZE)
>  
>  #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
>  
>  #endif /* __KERNEL__ */
>  
> Index: linux-2.6.27-rc1-mm1/include/asm-s390/thread_info.h
> ===================================================================
> --- linux-2.6.27-rc1-mm1.orig/include/asm-s390/thread_info.h
> +++ linux-2.6.27-rc1-mm1/include/asm-s390/thread_info.h
> @@ -96,10 +96,11 @@ static inline struct thread_info *curren
>  #define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling 
>  					   TIF_NEED_RESCHED */
>  #define TIF_31BIT		18	/* 32bit process */ 
>  #define TIF_MEMDIE		19
>  #define TIF_RESTORE_SIGMASK	20	/* restore signal mask in do_signal() */
> +#define TIF_FREEZE		21	/* thread is freezing for suspend */
>  
>  #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
>  #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
>  #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
>  #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
> @@ -108,10 +109,11 @@ static inline struct thread_info *curren
>  #define _TIF_SINGLE_STEP	(1<<TIF_SINGLE_STEP)
>  #define _TIF_MCCK_PENDING	(1<<TIF_MCCK_PENDING)
>  #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
>  #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
>  #define _TIF_31BIT		(1<<TIF_31BIT)
> +#define _TIF_FREEZE		(1<<TIF_FREEZE)
>  
>  #endif /* __KERNEL__ */
>  
>  #define PREEMPT_ACTIVE		0x4000000
>  
> Index: linux-2.6.27-rc1-mm1/include/asm-um/thread_info.h
> ===================================================================
> --- linux-2.6.27-rc1-mm1.orig/include/asm-um/thread_info.h
> +++ linux-2.6.27-rc1-mm1/include/asm-um/thread_info.h
> @@ -67,15 +67,17 @@ static inline struct thread_info *curren
>  					 */
>  #define TIF_RESTART_BLOCK 	4
>  #define TIF_MEMDIE	 	5
>  #define TIF_SYSCALL_AUDIT	6
>  #define TIF_RESTORE_SIGMASK	7
> +#define TIF_FREEZE		19	/* is freezing for suspend */
>  
>  #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
>  #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
>  #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
>  #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
>  #define _TIF_MEMDIE		(1 << TIF_MEMDIE)
>  #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
>  #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
> +#define _TIF_FREEZE		(1 << TIF_FREEZE)
>  
>  #endif
> Index: linux-2.6.27-rc1-mm1/include/asm-xtensa/thread_info.h
> ===================================================================
> --- linux-2.6.27-rc1-mm1.orig/include/asm-xtensa/thread_info.h
> +++ linux-2.6.27-rc1-mm1/include/asm-xtensa/thread_info.h
> @@ -132,18 +132,20 @@ static inline struct thread_info *curren
>  #define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
>  #define TIF_IRET		4	/* return with iret */
>  #define TIF_MEMDIE		5
>  #define TIF_RESTORE_SIGMASK	6	/* restore signal mask in do_signal() */
>  #define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
> +#define TIF_FREEZE		19	/* is freezing for suspend */
>  
>  #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
>  #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
>  #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
>  #define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
>  #define _TIF_IRET		(1<<TIF_IRET)
>  #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
>  #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
> +#define _TIF_FREEZE		(1<<TIF_FREEZE)
>  
>  #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
>  #define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
>  
>  /*
> Index: linux-2.6.27-rc1-mm1/arch/parisc/include/asm/thread_info.h
> ===================================================================
> --- linux-2.6.27-rc1-mm1.orig/arch/parisc/include/asm/thread_info.h
> +++ linux-2.6.27-rc1-mm1/arch/parisc/include/asm/thread_info.h
> @@ -56,17 +56,19 @@ struct thread_info {
>  #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
>  #define TIF_POLLING_NRFLAG	3	/* true if poll_idle() is polling TIF_NEED_RESCHED */
>  #define TIF_32BIT               4       /* 32 bit binary */
>  #define TIF_MEMDIE		5
>  #define TIF_RESTORE_SIGMASK	6	/* restore saved signal mask */
> +#define TIF_FREEZE		19	/* is freezing for suspend */
>  
>  #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
>  #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
>  #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
>  #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
>  #define _TIF_32BIT		(1 << TIF_32BIT)
>  #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
> +#define _TIF_FREEZE		(1 << TIF_FREEZE)
>  
>  #define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | \
>                                   _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK)
>  
>  #endif /* __KERNEL__ */
> 

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