#include <linux/module.h>
#include <linux/regset.h>
#include <linux/sched.h>
-#include <linux/bootmem.h>
#include <asm/sigcontext.h>
#include <asm/processor.h>
else
xstate_size = sizeof(struct i387_fsave_struct);
#endif
- init_task.thread.xstate = alloc_bootmem(xstate_size);
}
#ifdef CONFIG_X86_64
* value at reset if we support XMM instructions and then
* remeber the current task has used the FPU.
*/
-void init_fpu(struct task_struct *tsk)
+int init_fpu(struct task_struct *tsk)
{
if (tsk_used_math(tsk)) {
if (tsk == current)
unlazy_fpu(tsk);
- return;
+ return 0;
+ }
+
+ /*
+ * Memory allocation at the first usage of the FPU and other state.
+ */
+ if (!tsk->thread.xstate) {
+ tsk->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
+ GFP_KERNEL);
+ if (!tsk->thread.xstate)
+ return -ENOMEM;
}
if (cpu_has_fxsr) {
* Only the device not available exception or ptrace can call init_fpu.
*/
set_stopped_child_used_math(tsk);
+ return 0;
}
int fpregs_active(struct task_struct *target, const struct user_regset *regset)
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
+ int ret;
+
if (!cpu_has_fxsr)
return -ENODEV;
- init_fpu(target);
+ ret = init_fpu(target);
+ if (ret)
+ return ret;
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&target->thread.xstate->fxsave, 0, -1);
if (!cpu_has_fxsr)
return -ENODEV;
- init_fpu(target);
+ ret = init_fpu(target);
+ if (ret)
+ return ret;
+
set_stopped_child_used_math(target);
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
void *kbuf, void __user *ubuf)
{
struct user_i387_ia32_struct env;
+ int ret;
if (!HAVE_HWFP)
return fpregs_soft_get(target, regset, pos, count, kbuf, ubuf);
- init_fpu(target);
+ ret = init_fpu(target);
+ if (ret)
+ return ret;
if (!cpu_has_fxsr) {
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
if (!HAVE_HWFP)
return fpregs_soft_set(target, regset, pos, count, kbuf, ubuf);
- init_fpu(target);
+ ret = init_fpu(target);
+ if (ret)
+ return ret;
+
set_stopped_child_used_math(target);
if (!cpu_has_fxsr) {