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x86/fpu: Move math_state_restore() to fpu/core.c

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It's another piece of FPU internals that is better off close to
the other FPU internals.

Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-04-22 12:50:13 +02:00
parent 81683cc827
commit 93b90712c6
2 changed files with 42 additions and 42 deletions
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42
arch/x86/kernel/fpu/core.c
View File

@ -227,6 +227,48 @@ static int fpu__unlazy_stopped(struct task_struct *child)
return 0;
}
/*
* 'math_state_restore()' saves the current math information in the
* old math state array, and gets the new ones from the current task
*
* Careful.. There are problems with IBM-designed IRQ13 behaviour.
* Don't touch unless you *really* know how it works.
*
* Must be called with kernel preemption disabled (eg with local
* local interrupts as in the case of do_device_not_available).
*/
void math_state_restore(void)
{
struct task_struct *tsk = current;
if (!tsk_used_math(tsk)) {
local_irq_enable();
/*
* does a slab alloc which can sleep
*/
if (fpstate_alloc_init(tsk)) {
/*
* ran out of memory!
*/
do_group_exit(SIGKILL);
return;
}
local_irq_disable();
}
/* Avoid __kernel_fpu_begin() right after __thread_fpu_begin() */
kernel_fpu_disable();
__thread_fpu_begin(tsk);
if (unlikely(restore_fpu_checking(tsk))) {
fpu_reset_state(tsk);
force_sig_info(SIGSEGV, SEND_SIG_PRIV, tsk);
} else {
tsk->thread.fpu.counter++;
}
kernel_fpu_enable();
}
EXPORT_SYMBOL_GPL(math_state_restore);
void fpu__flush_thread(struct task_struct *tsk)
{
if (!use_eager_fpu()) {

42
arch/x86/kernel/traps.c
View File

@ -826,48 +826,6 @@ asmlinkage __visible void __attribute__((weak)) smp_threshold_interrupt(void)
{
}
/*
* 'math_state_restore()' saves the current math information in the
* old math state array, and gets the new ones from the current task
*
* Careful.. There are problems with IBM-designed IRQ13 behaviour.
* Don't touch unless you *really* know how it works.
*
* Must be called with kernel preemption disabled (eg with local
* local interrupts as in the case of do_device_not_available).
*/
void math_state_restore(void)
{
struct task_struct *tsk = current;
if (!tsk_used_math(tsk)) {
local_irq_enable();
/*
* does a slab alloc which can sleep
*/
if (fpstate_alloc_init(tsk)) {
/*
* ran out of memory!
*/
do_group_exit(SIGKILL);
return;
}
local_irq_disable();
}
/* Avoid __kernel_fpu_begin() right after __thread_fpu_begin() */
kernel_fpu_disable();
__thread_fpu_begin(tsk);
if (unlikely(restore_fpu_checking(tsk))) {
fpu_reset_state(tsk);
force_sig_info(SIGSEGV, SEND_SIG_PRIV, tsk);
} else {
tsk->thread.fpu.counter++;
}
kernel_fpu_enable();
}
EXPORT_SYMBOL_GPL(math_state_restore);
dotraplinkage void
do_device_not_available(struct pt_regs *regs, long error_code)
{