projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| cbf6b1ba PM |
1 | #include <linux/mm.h> |
| 2 | #include <linux/kernel.h> | |
| 3 | #include <linux/sched.h> | |
| 4 | ||
| 0ea820cf PM |
5 | struct kmem_cache *task_xstate_cachep = NULL; |
| 6 | unsigned int xstate_size; | |
| 7 | ||
| 8 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) | |
| 9 | { | |
| 10 | *dst = *src; | |
| 11 | ||
| 12 | if (src->thread.xstate) { | |
| 13 | dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep, | |
| 14 | GFP_KERNEL); | |
| 15 | if (!dst->thread.xstate) | |
| 16 | return -ENOMEM; | |
| 17 | memcpy(dst->thread.xstate, src->thread.xstate, xstate_size); | |
| 18 | } | |
| 19 | ||
| 20 | return 0; | |
| 21 | } | |
| 22 | ||
| 23 | void free_thread_xstate(struct task_struct *tsk) | |
| 24 | { | |
| 25 | if (tsk->thread.xstate) { | |
| 26 | kmem_cache_free(task_xstate_cachep, tsk->thread.xstate); | |
| 27 | tsk->thread.xstate = NULL; | |
| 28 | } | |
| 29 | } | |
| 30 | ||
| cbf6b1ba PM |
31 | #if THREAD_SHIFT < PAGE_SHIFT |
| 32 | static struct kmem_cache *thread_info_cache; | |
| 33 | ||
| 34 | struct thread_info *alloc_thread_info(struct task_struct *tsk) | |
| 35 | { | |
| 36 | struct thread_info *ti; | |
| 37 | ||
| 38 | ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL); | |
| 39 | if (unlikely(ti == NULL)) | |
| 40 | return NULL; | |
| 41 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
| 42 | memset(ti, 0, THREAD_SIZE); | |
| 43 | #endif | |
| 44 | return ti; | |
| 45 | } | |
| 46 | ||
| 47 | void free_thread_info(struct thread_info *ti) | |
| 48 | { | |
| 0ea820cf | 49 | free_thread_xstate(ti->task); |
| cbf6b1ba PM |
50 | kmem_cache_free(thread_info_cache, ti); |
| 51 | } | |
| 52 | ||
| 53 | void thread_info_cache_init(void) | |
| 54 | { | |
| 55 | thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE, | |
| a3705799 | 56 | THREAD_SIZE, SLAB_PANIC, NULL); |
| cbf6b1ba PM |
57 | } |
| 58 | #else | |
| 59 | struct thread_info *alloc_thread_info(struct task_struct *tsk) | |
| 60 | { | |
| 61 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
| 62 | gfp_t mask = GFP_KERNEL | __GFP_ZERO; | |
| 63 | #else | |
| 64 | gfp_t mask = GFP_KERNEL; | |
| 65 | #endif | |
| 66 | return (struct thread_info *)__get_free_pages(mask, THREAD_SIZE_ORDER); | |
| 67 | } | |
| 68 | ||
| 69 | void free_thread_info(struct thread_info *ti) | |
| 70 | { | |
| 0ea820cf | 71 | free_thread_xstate(ti->task); |
| cbf6b1ba PM |
72 | free_pages((unsigned long)ti, THREAD_SIZE_ORDER); |
| 73 | } | |
| 74 | #endif /* THREAD_SHIFT < PAGE_SHIFT */ | |
| 0ea820cf PM |
75 | |
| 76 | void arch_task_cache_init(void) | |
| 77 | { | |
| 78 | if (!xstate_size) | |
| 79 | return; | |
| 80 | ||
| 81 | task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size, | |
| 82 | __alignof__(union thread_xstate), | |
| 83 | SLAB_PANIC | SLAB_NOTRACK, NULL); | |
| 84 | } | |
| 85 | ||
| 86 | #ifdef CONFIG_SH_FPU_EMU | |
| 87 | # define HAVE_SOFTFP 1 | |
| 88 | #else | |
| 89 | # define HAVE_SOFTFP 0 | |
| 90 | #endif | |
| 91 | ||
| 4a6feab0 | 92 | void __cpuinit init_thread_xstate(void) |
| 0ea820cf PM |
93 | { |
| 94 | if (boot_cpu_data.flags & CPU_HAS_FPU) | |
| 95 | xstate_size = sizeof(struct sh_fpu_hard_struct); | |
| 96 | else if (HAVE_SOFTFP) | |
| 97 | xstate_size = sizeof(struct sh_fpu_soft_struct); | |
| 98 | else | |
| 99 | xstate_size = 0; | |
| 100 | } |