LXR linux/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
   6struct kmem_cache *task_xstate_cachep = NULL;
   7unsigned int xstate_size;
   8
   9int 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
  24void 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
  33static struct kmem_cache *thread_info_cache;
  34
  35struct 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
  48void free_thread_info(struct thread_info *ti)
  49{
  50        free_thread_xstate(ti->task);
  51        kmem_cache_free(thread_info_cache, ti);
  52}
  53
  54void 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
  60struct 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
  72void 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
  79void 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
  95void __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