diff options
author | Suresh Siddha <suresh.b.siddha@intel.com> | 2012-05-16 22:03:51 (GMT) |
---|---|---|
committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-05-16 22:16:26 (GMT) |
commit | 55ccf3fe3f9a3441731aa79cf42a628fc4ecace9 (patch) | |
tree | fc1baa880f32e9da083998bda8aefc335846fd52 /arch/sh | |
parent | 36be50515fe2aef61533b516fa2576a2c7fe7664 (diff) | |
download | linux-55ccf3fe3f9a3441731aa79cf42a628fc4ecace9.tar.xz |
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>
Diffstat (limited to 'arch/sh')
-rw-r--r-- | arch/sh/include/asm/processor_32.h | 3 | ||||
-rw-r--r-- | arch/sh/include/asm/processor_64.h | 1 | ||||
-rw-r--r-- | arch/sh/kernel/process.c | 7 | ||||
-rw-r--r-- | arch/sh/kernel/process_32.c | 9 |
4 files changed, 7 insertions, 13 deletions
diff --git a/arch/sh/include/asm/processor_32.h b/arch/sh/include/asm/processor_32.h index 900f8d7..b6311fd 100644 --- a/arch/sh/include/asm/processor_32.h +++ b/arch/sh/include/asm/processor_32.h @@ -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 */ diff --git a/arch/sh/include/asm/processor_64.h b/arch/sh/include/asm/processor_64.h index e25c4c7..fe99afe 100644 --- a/arch/sh/include/asm/processor_64.h +++ b/arch/sh/include/asm/processor_64.h @@ -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. */ diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c index 325f98b..2bde59e 100644 --- a/arch/sh/kernel/process.c +++ b/arch/sh/kernel/process.c @@ -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) { diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c index 94273aa..dee5961 100644 --- a/arch/sh/kernel/process_32.c +++ b/arch/sh/kernel/process_32.c @@ -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, |