Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[firefly-linux-kernel-4.4.55.git] / arch / sh / kernel / process.c
1 #include <linux/mm.h>
2 #include <linux/kernel.h>
3 #include <linux/slab.h>
4 #include <linux/sched.h>
5 #include <linux/export.h>
6 #include <linux/stackprotector.h>
7 #include <asm/fpu.h>
8
9 struct kmem_cache *task_xstate_cachep = NULL;
10 unsigned int xstate_size;
11
12 #ifdef CONFIG_CC_STACKPROTECTOR
13 unsigned long __stack_chk_guard __read_mostly;
14 EXPORT_SYMBOL(__stack_chk_guard);
15 #endif
16
17 /*
18  * this gets called so that we can store lazy state into memory and copy the
19  * current task into the new thread.
20  */
21 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
22 {
23 #ifdef CONFIG_SUPERH32
24         unlazy_fpu(src, task_pt_regs(src));
25 #endif
26         *dst = *src;
27
28         if (src->thread.xstate) {
29                 dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
30                                                       GFP_KERNEL);
31                 if (!dst->thread.xstate)
32                         return -ENOMEM;
33                 memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
34         }
35
36         return 0;
37 }
38
39 void free_thread_xstate(struct task_struct *tsk)
40 {
41         if (tsk->thread.xstate) {
42                 kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
43                 tsk->thread.xstate = NULL;
44         }
45 }
46
47 void arch_release_task_struct(struct task_struct *tsk)
48 {
49         free_thread_xstate(tsk);
50 }
51
52 void arch_task_cache_init(void)
53 {
54         if (!xstate_size)
55                 return;
56
57         task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
58                                                __alignof__(union thread_xstate),
59                                                SLAB_PANIC | SLAB_NOTRACK, NULL);
60 }
61
62 #ifdef CONFIG_SH_FPU_EMU
63 # define HAVE_SOFTFP    1
64 #else
65 # define HAVE_SOFTFP    0
66 #endif
67
68 void init_thread_xstate(void)
69 {
70         if (boot_cpu_data.flags & CPU_HAS_FPU)
71                 xstate_size = sizeof(struct sh_fpu_hard_struct);
72         else if (HAVE_SOFTFP)
73                 xstate_size = sizeof(struct sh_fpu_soft_struct);
74         else
75                 xstate_size = 0;
76 }