summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/signal_64.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/kernel/signal_64.c')
-rw-r--r--arch/powerpc/kernel/signal_64.c20
1 files changed, 11 insertions, 9 deletions
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 5462bef898f6..7b9d999e2115 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -207,10 +207,20 @@ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
if (!sig)
regs->gpr[13] = save_r13;
- err |= __copy_from_user(&current->thread.fpr, &sc->fp_regs, FP_REGS_SIZE);
if (set != NULL)
err |= __get_user(set->sig[0], &sc->oldmask);
+ /*
+ * Do this before updating the thread state in
+ * current->thread.fpr/vr. That way, if we get preempted
+ * and another task grabs the FPU/Altivec, it won't be
+ * tempted to save the current CPU state into the thread_struct
+ * and corrupt what we are writing there.
+ */
+ discard_lazy_cpu_state();
+
+ err |= __copy_from_user(&current->thread.fpr, &sc->fp_regs, FP_REGS_SIZE);
+
#ifdef CONFIG_ALTIVEC
err |= __get_user(v_regs, &sc->v_regs);
err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
@@ -229,14 +239,6 @@ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
current->thread.vrsave = 0;
#endif /* CONFIG_ALTIVEC */
-#ifndef CONFIG_SMP
- preempt_disable();
- if (last_task_used_math == current)
- last_task_used_math = NULL;
- if (last_task_used_altivec == current)
- last_task_used_altivec = NULL;
- preempt_enable();
-#endif
/* Force reload of FP/VEC */
regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC);
OpenPOWER on IntegriCloud