1 #include <linux/mm.h>
2 #include <linux/kernel.h>
3 #include <linux/slab.h>
4 #include <linux/sched.h>
5
6 struct kmem_cache *task_xstate_cachep = NULL;
7 unsigned int xstate_size;
8
arch_dup_task_struct(struct task_struct * dst,struct task_struct * src)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
free_thread_xstate(struct task_struct * tsk)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
32 #if THREAD_SHIFT < PAGE_SHIFT
33 static struct kmem_cache *thread_info_cache;
34
alloc_thread_info_node(struct task_struct * tsk,int node)35 struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node)
36 {
37 struct thread_info *ti;
38 #ifdef CONFIG_DEBUG_STACK_USAGE
39 gfp_t mask = GFP_KERNEL | __GFP_ZERO;
40 #else
41 gfp_t mask = GFP_KERNEL;
42 #endif
43
44 ti = kmem_cache_alloc_node(thread_info_cache, mask, node);
45 return ti;
46 }
47
free_thread_info(struct thread_info * ti)48 void free_thread_info(struct thread_info *ti)
49 {
50 free_thread_xstate(ti->task);
51 kmem_cache_free(thread_info_cache, ti);
52 }
53
thread_info_cache_init(void)54 void thread_info_cache_init(void)
55 {
56 thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
57 THREAD_SIZE, SLAB_PANIC, NULL);
58 }
59 #else
alloc_thread_info_node(struct task_struct * tsk,int node)60 struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node)
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 struct page *page = alloc_pages_node(node, mask, THREAD_SIZE_ORDER);
68
69 return page ? page_address(page) : NULL;
70 }
71
free_thread_info(struct thread_info * ti)72 void free_thread_info(struct thread_info *ti)
73 {
74 free_thread_xstate(ti->task);
75 free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
76 }
77 #endif /* THREAD_SHIFT < PAGE_SHIFT */
78
arch_task_cache_init(void)79 void arch_task_cache_init(void)
80 {
81 if (!xstate_size)
82 return;
83
84 task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
85 __alignof__(union thread_xstate),
86 SLAB_PANIC | SLAB_NOTRACK, NULL);
87 }
88
89 #ifdef CONFIG_SH_FPU_EMU
90 # define HAVE_SOFTFP 1
91 #else
92 # define HAVE_SOFTFP 0
93 #endif
94
init_thread_xstate(void)95 void __cpuinit init_thread_xstate(void)
96 {
97 if (boot_cpu_data.flags & CPU_HAS_FPU)
98 xstate_size = sizeof(struct sh_fpu_hard_struct);
99 else if (HAVE_SOFTFP)
100 xstate_size = sizeof(struct sh_fpu_soft_struct);
101 else
102 xstate_size = 0;
103 }
104