git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| cbf6b1ba PM |
1 | #include <linux/mm.h> |
| 2 | #include <linux/kernel.h> | |
| 5a0e3ad6 | 3 | #include <linux/slab.h> |
| cbf6b1ba PM |
4 | #include <linux/sched.h> |
| 5 | ||
| 0ea820cf PM |
6 | struct kmem_cache *task_xstate_cachep = NULL; |
| 7 | unsigned int xstate_size; | |
| 8 | ||
| 9 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) | |
| 10 | { | |
| 11 | *dst = *src; | |
| 12 | ||
| 13 | if (src->thread.xstate) { | |
| 14 | dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep, | |
| 15 | GFP_KERNEL); | |
| 16 | if (!dst->thread.xstate) | |
| 17 | return -ENOMEM; | |
| 18 | memcpy(dst->thread.xstate, src->thread.xstate, xstate_size); | |
| 19 | } | |
| 20 | ||
| 21 | return 0; | |
| 22 | } | |
| 23 | ||
| 24 | void free_thread_xstate(struct task_struct *tsk) | |
| 25 | { | |
| 26 | if (tsk->thread.xstate) { | |
| 27 | kmem_cache_free(task_xstate_cachep, tsk->thread.xstate); | |
| 28 | tsk->thread.xstate = NULL; | |
| 29 | } | |
| 30 | } | |
| 31 | ||
| cbf6b1ba PM |
32 | #if THREAD_SHIFT < PAGE_SHIFT |
| 33 | static struct kmem_cache *thread_info_cache; | |
| 34 | ||
| 35 | struct thread_info *alloc_thread_info(struct task_struct *tsk) | |
| 36 | { | |
| 37 | struct thread_info *ti; | |
| 38 | ||
| 39 | ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL); | |
| 40 | if (unlikely(ti == NULL)) | |
| 41 | return NULL; | |
| 42 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
| 43 | memset(ti, 0, THREAD_SIZE); | |
| 44 | #endif | |
| 45 | return ti; | |
| 46 | } | |
| 47 | ||
| 48 | void free_thread_info(struct thread_info *ti) | |
| 49 | { | |
| 0ea820cf | 50 | free_thread_xstate(ti->task); |
| cbf6b1ba PM |
51 | kmem_cache_free(thread_info_cache, ti); |
| 52 | } | |
| 53 | ||
| 54 | void thread_info_cache_init(void) | |
| 55 | { | |
| 56 | thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE, | |
| a3705799 | 57 | THREAD_SIZE, SLAB_PANIC, NULL); |
| cbf6b1ba PM |
58 | } |
| 59 | #else | |
| 60 | struct thread_info *alloc_thread_info(struct task_struct *tsk) | |
| 61 | { | |
| 62 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
| 63 | gfp_t mask = GFP_KERNEL | __GFP_ZERO; | |
| 64 | #else | |
| 65 | gfp_t mask = GFP_KERNEL; | |
| 66 | #endif | |
| 67 | return (struct thread_info *)__get_free_pages(mask, THREAD_SIZE_ORDER); | |
| 68 | } | |
| 69 | ||
| 70 | void free_thread_info(struct thread_info *ti) | |
| 71 | { | |
| 0ea820cf | 72 | free_thread_xstate(ti->task); |
| cbf6b1ba PM |
73 | free_pages((unsigned long)ti, THREAD_SIZE_ORDER); |
| 74 | } | |
| 75 | #endif /* THREAD_SHIFT < PAGE_SHIFT */ | |
| 0ea820cf PM |
76 | |
| 77 | void arch_task_cache_init(void) | |
| 78 | { | |
| 79 | if (!xstate_size) | |
| 80 | return; | |
| 81 | ||
| 82 | task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size, | |
| 83 | __alignof__(union thread_xstate), | |
| 84 | SLAB_PANIC | SLAB_NOTRACK, NULL); | |
| 85 | } | |
| 86 | ||
| 87 | #ifdef CONFIG_SH_FPU_EMU | |
| 88 | # define HAVE_SOFTFP 1 | |
| 89 | #else | |
| 90 | # define HAVE_SOFTFP 0 | |
| 91 | #endif | |
| 92 | ||
| 93 | void init_thread_xstate(void) | |
| 94 | { | |
| 95 | if (boot_cpu_data.flags & CPU_HAS_FPU) | |
| 96 | xstate_size = sizeof(struct sh_fpu_hard_struct); | |
| 97 | else if (HAVE_SOFTFP) | |
| 98 | xstate_size = sizeof(struct sh_fpu_soft_struct); | |
| 99 | else | |
| 100 | xstate_size = 0; | |
| 101 | } |