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fork: move the real prepare_to_copy() users to arch_dup_task_struct() 

Historical prepare_to_copy() is mostly a no-op, duplicated for majority of
the architectures and the rest following the x86 model of flushing the extended
register state like fpu there.

Remove it and use the arch_dup_task_struct() instead.

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1336692811-30576-1-git-send-email-suresh.b.siddha@intel.com
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Chris Zankel <chris@zankel.net>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Mark Salter <msalter@redhat.com>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: James E.J. Bottomley <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Suresh Siddha 2012-05-16 15:03:51 -07:00 committed by H. Peter Anvin
parent 36be50515f
commit 55ccf3fe3f
39 changed files with 36 additions and 140 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/alpha/include/asm/processor.h
View File

@ -49,9 +49,6 @@ extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
/* Create a kernel thread without removing it from tasklists. */
extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);

3
arch/arm/include/asm/processor.h
View File

@ -77,9 +77,6 @@ struct task_struct;
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
unsigned long get_wchan(struct task_struct *p);
#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)

3
arch/avr32/include/asm/processor.h
View File

@ -145,9 +145,6 @@ extern void release_thread(struct task_struct *);
/* Create a kernel thread without removing it from tasklists */
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while(0)
/* Return saved PC of a blocked thread */
#define thread_saved_pc(tsk) ((tsk)->thread.cpu_context.pc)

2
arch/blackfin/include/asm/processor.h
View File

@ -75,8 +75,6 @@ static inline void release_thread(struct task_struct *dead_task)
{
}
#define prepare_to_copy(tsk) do { } while (0)
extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
/*

3
arch/c6x/include/asm/processor.h
View File

@ -92,9 +92,6 @@ static inline void release_thread(struct task_struct *dead_task)
{
}
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
#define copy_segments(tsk, mm) do { } while (0)

4
arch/cris/include/asm/processor.h
View File

@ -50,10 +50,6 @@ struct task_struct;
#define task_pt_regs(task) user_regs(task_thread_info(task))
#define current_regs() task_pt_regs(current)
static inline void prepare_to_copy(struct task_struct *tsk)
{
}
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
unsigned long get_wchan(struct task_struct *p);

2
arch/frv/include/asm/processor.h
View File

@ -103,8 +103,6 @@ do { \
__frame->sp = (_usp); \
} while(0)
extern void prepare_to_copy(struct task_struct *tsk);
/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
{

11
arch/frv/kernel/process.c
View File

@ -180,17 +180,6 @@ asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
return do_fork(clone_flags, newsp, __frame, 0, parent_tidptr, child_tidptr);
} /* end sys_clone() */
/*****************************************************************************/
/*
* This gets called before we allocate a new thread and copy
* the current task into it.
*/
void prepare_to_copy(struct task_struct *tsk)
{
//unlazy_fpu(tsk);
} /* end prepare_to_copy() */
/*****************************************************************************/
/*
* set up the kernel stack and exception frames for a new process
*/

2
arch/h8300/include/asm/processor.h
View File

@ -109,8 +109,6 @@ static inline void release_thread(struct task_struct *dead_task)
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
#define prepare_to_copy(tsk) do { } while (0)
/*
* Free current thread data structures etc..
*/

7
arch/hexagon/include/asm/processor.h
View File

@ -58,13 +58,6 @@ struct thread_struct {
#define cpu_relax() __vmyield()
/*
* "Unlazying all lazy status" occurs here.
*/
static inline void prepare_to_copy(struct task_struct *tsk)
{
}
/*
* Decides where the kernel will search for a free chunk of vm space during
* mmaps.

3
arch/ia64/include/asm/processor.h
View File

@ -343,9 +343,6 @@ struct task_struct;
*/
#define release_thread(dead_task)
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
/*
* This is the mechanism for creating a new kernel thread.
*

2
arch/m32r/include/asm/processor.h
View File

@ -118,8 +118,6 @@ struct mm_struct;
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
#define prepare_to_copy(tsk) do { } while (0)
/*
* create a kernel thread without removing it from tasklists
*/

3
arch/m68k/include/asm/processor.h
View File

@ -153,9 +153,6 @@ static inline void release_thread(struct task_struct *dead_task)
{
}
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
/*

1
arch/microblaze/include/asm/processor.h
View File

@ -23,7 +23,6 @@ extern const struct seq_operations cpuinfo_op;
# define cpu_relax() barrier()
# define cpu_sleep() do {} while (0)
# define prepare_to_copy(tsk) do {} while (0)
#define task_pt_regs(tsk) \
(((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)

3
arch/mips/include/asm/processor.h
View File

@ -310,9 +310,6 @@ struct task_struct;
/* Free all resources held by a thread. */
#define release_thread(thread) do { } while(0)
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
extern unsigned long thread_saved_pc(struct task_struct *tsk);

3
arch/mn10300/include/asm/processor.h
View File

@ -139,9 +139,6 @@ static inline void start_thread(struct pt_regs *regs,
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/* Prepare to copy thread state - unlazy all lazy status */
extern void prepare_to_copy(struct task_struct *tsk);
/*
* create a kernel thread without removing it from tasklists
*/

10
arch/mn10300/kernel/process.c
View File

@ -208,12 +208,14 @@ void copy_segments(struct task_struct *p, struct mm_struct *new_mm)
}
/*
* this gets called before we allocate a new thread and copy the current task
* into it so that we can store lazy state into memory
* this gets called so that we can store lazy state into memory and copy the
* current task into the new thread.
*/
void prepare_to_copy(struct task_struct *tsk)
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
unlazy_fpu(tsk);
unlazy_fpu(src);
*dst = *src;
return 0;
}
/*

4
arch/openrisc/include/asm/processor.h
View File

@ -72,10 +72,6 @@ struct thread_struct {
#define task_pt_regs(task) user_regs(task_thread_info(task))
#define current_regs() user_regs(current_thread_info())
extern inline void prepare_to_copy(struct task_struct *tsk)
{
}
#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
#define INIT_THREAD { }

3
arch/parisc/include/asm/processor.h
View File

@ -328,9 +328,6 @@ struct mm_struct;
extern void release_thread(struct task_struct *);
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
extern unsigned long get_wchan(struct task_struct *p);

3
arch/powerpc/include/asm/processor.h
View File

@ -74,9 +74,6 @@ struct task_struct;
void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
void release_thread(struct task_struct *);
/* Prepare to copy thread state - unlazy all lazy status */
extern void prepare_to_copy(struct task_struct *tsk);
/* Create a new kernel thread. */
extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);

19
arch/powerpc/kernel/process.c
View File

@ -711,18 +711,21 @@ release_thread(struct task_struct *t)
}
/*
* This gets called before we allocate a new thread and copy
* the current task into it.
* this gets called so that we can store coprocessor state into memory and
* copy the current task into the new thread.
*/
void prepare_to_copy(struct task_struct *tsk)
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
flush_fp_to_thread(current);
flush_altivec_to_thread(current);
flush_vsx_to_thread(current);
flush_spe_to_thread(current);
flush_fp_to_thread(src);
flush_altivec_to_thread(src);
flush_vsx_to_thread(src);
flush_spe_to_thread(src);
#ifdef CONFIG_HAVE_HW_BREAKPOINT
flush_ptrace_hw_breakpoint(tsk);
flush_ptrace_hw_breakpoint(src);
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
*dst = *src;
return 0;
}
/*

3
arch/s390/include/asm/processor.h
View File

@ -141,9 +141,6 @@ struct seq_file;
extern void release_thread(struct task_struct *);
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
/*
* Return saved PC of a blocked thread.
*/

1
arch/score/include/asm/processor.h
View File

@ -26,7 +26,6 @@ extern unsigned long get_wchan(struct task_struct *p);
#define cpu_relax() barrier()
#define release_thread(thread) do {} while (0)
#define prepare_to_copy(tsk) do {} while (0)
/*
* User space process size: 2GB. This is hardcoded into a few places,

3
arch/sh/include/asm/processor_32.h
View File

@ -126,9 +126,6 @@ extern void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned lo
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/* Prepare to copy thread state - unlazy all lazy status */
void prepare_to_copy(struct task_struct *tsk);
/*
* create a kernel thread without removing it from tasklists
*/

1
arch/sh/include/asm/processor_64.h
View File

@ -172,7 +172,6 @@ extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
#define copy_segments(p, mm) do { } while (0)
#define release_segments(mm) do { } while (0)
#define forget_segments() do { } while (0)
#define prepare_to_copy(tsk) do { } while (0)
/*
* FPU lazy state save handling.
*/

7
arch/sh/kernel/process.c
View File

@ -6,8 +6,15 @@
struct kmem_cache *task_xstate_cachep = NULL;
unsigned int xstate_size;
/*
* this gets called so that we can store lazy state into memory and copy the
* current task into the new thread.
*/
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
#ifdef CONFIG_SUPERH32
unlazy_fpu(src, task_pt_regs(src));
#endif
*dst = *src;
if (src->thread.xstate) {

9
arch/sh/kernel/process_32.c
View File

@ -155,15 +155,6 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
}
EXPORT_SYMBOL(dump_fpu);
/*
* This gets called before we allocate a new thread and copy
* the current task into it.
*/
void prepare_to_copy(struct task_struct *tsk)
{
unlazy_fpu(tsk, task_pt_regs(tsk));
}
asmlinkage void ret_from_fork(void);
int copy_thread(unsigned long clone_flags, unsigned long usp,

3
arch/sparc/include/asm/processor_32.h
View File

@ -109,9 +109,6 @@ static inline void start_thread(struct pt_regs * regs, unsigned long pc,
#define release_thread(tsk) do { } while(0)
extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
extern unsigned long get_wchan(struct task_struct *);
#define task_pt_regs(tsk) ((tsk)->thread.kregs)

3
arch/sparc/include/asm/processor_64.h
View File

@ -186,9 +186,6 @@ do { \
/* Free all resources held by a thread. */
#define release_thread(tsk) do { } while (0)
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
extern unsigned long get_wchan(struct task_struct *task);

3
arch/tile/include/asm/processor.h
View File

@ -210,9 +210,6 @@ static inline void release_thread(struct task_struct *dead_task)
/* Nothing for now */
}
/* Prepare to copy thread state - unlazy all lazy status. */
#define prepare_to_copy(tsk) do { } while (0)
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
extern int do_work_pending(struct pt_regs *regs, u32 flags);

5
arch/um/include/asm/processor-generic.h
View File

@ -76,11 +76,6 @@ static inline void release_thread(struct task_struct *task)
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
static inline void prepare_to_copy(struct task_struct *tsk)
{
}
extern unsigned long thread_saved_pc(struct task_struct *t);
static inline void mm_copy_segments(struct mm_struct *from_mm,

3
arch/unicore32/include/asm/processor.h
View File

@ -68,9 +68,6 @@ struct task_struct;
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)
unsigned long get_wchan(struct task_struct *p);
#define cpu_relax() barrier()

3
arch/x86/include/asm/processor.h
View File

@ -579,9 +579,6 @@ extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/* Prepare to copy thread state - unlazy all lazy state */
extern void prepare_to_copy(struct task_struct *tsk);
unsigned long get_wchan(struct task_struct *p);
/*

6
arch/x86/kernel/process.c
View File

@ -47,10 +47,16 @@ EXPORT_SYMBOL_GPL(idle_notifier_unregister);
struct kmem_cache *task_xstate_cachep;
EXPORT_SYMBOL_GPL(task_xstate_cachep);
/*
* this gets called so that we can store lazy state into memory and copy the
* current task into the new thread.
*/
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
int ret;
unlazy_fpu(src);
*dst = *src;
if (fpu_allocated(&src->thread.fpu)) {
memset(&dst->thread.fpu, 0, sizeof(dst->thread.fpu));

9
arch/x86/kernel/process_32.c
View File

@ -126,15 +126,6 @@ void release_thread(struct task_struct *dead_task)
release_vm86_irqs(dead_task);
}
/*
* This gets called before we allocate a new thread and copy
* the current task into it.
*/
void prepare_to_copy(struct task_struct *tsk)
{
unlazy_fpu(tsk);
}
int copy_thread(unsigned long clone_flags, unsigned long sp,
unsigned long unused,
struct task_struct *p, struct pt_regs *regs)

9
arch/x86/kernel/process_64.c
View File

@ -145,15 +145,6 @@ static inline u32 read_32bit_tls(struct task_struct *t, int tls)
return get_desc_base(&t->thread.tls_array[tls]);
}
/*
* This gets called before we allocate a new thread and copy
* the current task into it.
*/
void prepare_to_copy(struct task_struct *tsk)
{
unlazy_fpu(tsk);
}
int copy_thread(unsigned long clone_flags, unsigned long sp,
unsigned long unused,
struct task_struct *p, struct pt_regs *regs)

3
arch/xtensa/include/asm/processor.h
View File

@ -168,9 +168,6 @@ struct mm_struct;
/* Free all resources held by a thread. */
#define release_thread(thread) do { } while(0)
/* Prepare to copy thread state - unlazy all lazy status */
extern void prepare_to_copy(struct task_struct*);
/* Create a kernel thread without removing it from tasklists */
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

9
arch/xtensa/kernel/process.c
View File

@ -140,13 +140,16 @@ void flush_thread(void)
}
/*
* This is called before the thread is copied.
* this gets called so that we can store coprocessor state into memory and
* copy the current task into the new thread.
*/
void prepare_to_copy(struct task_struct *tsk)
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
#if XTENSA_HAVE_COPROCESSORS
coprocessor_flush_all(task_thread_info(tsk));
coprocessor_flush_all(task_thread_info(src));
#endif
*dst = *src;
return 0;
}
/*

2
kernel/fork.c
View File

@ -261,8 +261,6 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
int node = tsk_fork_get_node(orig);
int err;
prepare_to_copy(orig);
tsk = alloc_task_struct_node(node);
if (!tsk)
return NULL;