[linux-2.6-block.git] / arch / sh / kernel / process.c

#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sched.h>

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) {
		dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
						      GFP_KERNEL);
		if (!dst->thread.xstate)
			return -ENOMEM;
		memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
	}

	return 0;
}

void free_thread_xstate(struct task_struct *tsk)
{
	if (tsk->thread.xstate) {
		kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
		tsk->thread.xstate = NULL;
	}
}

#if THREAD_SHIFT < PAGE_SHIFT
static struct kmem_cache *thread_info_cache;

struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node)
{
	struct thread_info *ti;
#ifdef CONFIG_DEBUG_STACK_USAGE
	gfp_t mask = GFP_KERNEL | __GFP_ZERO;
#else
	gfp_t mask = GFP_KERNEL;
#endif

	ti = kmem_cache_alloc_node(thread_info_cache, mask, node);
	return ti;
}

void free_thread_info(struct thread_info *ti)
{
	free_thread_xstate(ti->task);
	kmem_cache_free(thread_info_cache, ti);
}

void thread_info_cache_init(void)
{
	thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
					      THREAD_SIZE, SLAB_PANIC, NULL);
}
#else
struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node)
{
#ifdef CONFIG_DEBUG_STACK_USAGE
	gfp_t mask = GFP_KERNEL | __GFP_ZERO;
#else
	gfp_t mask = GFP_KERNEL;
#endif
	struct page *page = alloc_pages_node(node, mask, THREAD_SIZE_ORDER);

	return page ? page_address(page) : NULL;
}

void free_thread_info(struct thread_info *ti)
{
	free_thread_xstate(ti->task);
	free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
}
#endif /* THREAD_SHIFT < PAGE_SHIFT */

void arch_task_cache_init(void)
{
	if (!xstate_size)
		return;

	task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
					       __alignof__(union thread_xstate),
					       SLAB_PANIC | SLAB_NOTRACK, NULL);
}

#ifdef CONFIG_SH_FPU_EMU
# define HAVE_SOFTFP	1
#else
# define HAVE_SOFTFP	0
#endif

void __cpuinit init_thread_xstate(void)
{
	if (boot_cpu_data.flags & CPU_HAS_FPU)
		xstate_size = sizeof(struct sh_fpu_hard_struct);
	else if (HAVE_SOFTFP)
		xstate_size = sizeof(struct sh_fpu_soft_struct);
	else
		xstate_size = 0;
}
Commit	Line	Data
cbf6b1ba PM	1	#include <linux/mm.h>
cbf6b1ba PM	2	#include <linux/kernel.h>
5a0e3ad6	3	#include <linux/slab.h>
cbf6b1ba PM	4	#include <linux/sched.h>
cbf6b1ba PM	5
0ea820cf PM	6	struct kmem_cache *task_xstate_cachep = NULL;
	7	unsigned int xstate_size;
	8
55ccf3fe SS	9	/*
	10	* this gets called so that we can store lazy state into memory and copy the
	11	* current task into the new thread.
	12	*/
0ea820cf PM	13	int arch_dup_task_struct(struct task_struct dst, struct task_struct src)
0ea820cf PM	14	{
55ccf3fe SS	15	#ifdef CONFIG_SUPERH32
	16	unlazy_fpu(src, task_pt_regs(src));
	17	#endif
0ea820cf PM	18	dst = src;
	19
	20	if (src->thread.xstate) {
	21	dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
	22	GFP_KERNEL);
	23	if (!dst->thread.xstate)
	24	return -ENOMEM;
	25	memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
	26	}
	27
	28	return 0;
	29	}
	30
	31	void free_thread_xstate(struct task_struct *tsk)
	32	{
	33	if (tsk->thread.xstate) {
	34	kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
	35	tsk->thread.xstate = NULL;
	36	}
	37	}
	38
cbf6b1ba PM	39	#if THREAD_SHIFT < PAGE_SHIFT
	40	static struct kmem_cache *thread_info_cache;
	41
b15ed691	42	struct thread_info alloc_thread_info_node(struct task_struct tsk, int node)
cbf6b1ba PM	43	{
cbf6b1ba PM	44	struct thread_info *ti;
cbf6b1ba	45	#ifdef CONFIG_DEBUG_STACK_USAGE
b6a84016 ED	46	gfp_t mask = GFP_KERNEL \| __GFP_ZERO;
	47	#else
	48	gfp_t mask = GFP_KERNEL;
cbf6b1ba	49	#endif
b6a84016 ED	50
b6a84016 ED	51	ti = kmem_cache_alloc_node(thread_info_cache, mask, node);
cbf6b1ba PM	52	return ti;
	53	}
	54
	55	void free_thread_info(struct thread_info *ti)
	56	{
0ea820cf	57	free_thread_xstate(ti->task);
cbf6b1ba PM	58	kmem_cache_free(thread_info_cache, ti);
	59	}
	60
	61	void thread_info_cache_init(void)
	62	{
	63	thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
a3705799	64	THREAD_SIZE, SLAB_PANIC, NULL);
cbf6b1ba PM	65	}
cbf6b1ba PM	66	#else
b15ed691	67	struct thread_info alloc_thread_info_node(struct task_struct tsk, int node)
cbf6b1ba PM	68	{
	69	#ifdef CONFIG_DEBUG_STACK_USAGE
	70	gfp_t mask = GFP_KERNEL \| __GFP_ZERO;
	71	#else
	72	gfp_t mask = GFP_KERNEL;
	73	#endif
b6a84016 ED	74	struct page *page = alloc_pages_node(node, mask, THREAD_SIZE_ORDER);
	75
	76	return page ? page_address(page) : NULL;
cbf6b1ba PM	77	}
	78
	79	void free_thread_info(struct thread_info *ti)
	80	{
0ea820cf	81	free_thread_xstate(ti->task);
cbf6b1ba PM	82	free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
	83	}
	84	#endif /* THREAD_SHIFT < PAGE_SHIFT */
0ea820cf PM	85
	86	void arch_task_cache_init(void)
	87	{
	88	if (!xstate_size)
	89	return;
	90
	91	task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
	92	__alignof__(union thread_xstate),
	93	SLAB_PANIC \| SLAB_NOTRACK, NULL);
	94	}
	95
	96	#ifdef CONFIG_SH_FPU_EMU
	97	# define HAVE_SOFTFP 1
	98	#else
	99	# define HAVE_SOFTFP 0
	100	#endif
	101
4a6feab0	102	void __cpuinit init_thread_xstate(void)
0ea820cf PM	103	{
	104	if (boot_cpu_data.flags & CPU_HAS_FPU)
	105	xstate_size = sizeof(struct sh_fpu_hard_struct);
	106	else if (HAVE_SOFTFP)
	107	xstate_size = sizeof(struct sh_fpu_soft_struct);
	108	else
	109	xstate_size = 0;
	110	}