x86/fpu: Use task_disable_lazy_fpu_restore() helper

Replace magic assignments of fpu.last_cpu = ~0 with more explicit
task_disable_lazy_fpu_restore() calls.

Signed-off-by: Rik van Riel <riel@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1423252925-14451-8-git-send-email-riel@redhat.com
Signed-off-by: Borislav Petkov <bp@suse.de>

diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h
index 04c2807..e5f8f8e 100644 (file)
--- a/arch/x86/include/asm/fpu-internal.h
+++ b/arch/x86/include/asm/fpu-internal.h
@@ -439,7 +439,7 @@ static inline fpu_switch_t switch_fpu_prepare(struct task_struct *old, struct ta
 
        if (__thread_has_fpu(old)) {
                if (!__save_init_fpu(old))
-                       old->thread.fpu.last_cpu = ~0;
+                       task_disable_lazy_fpu_restore(old);
                else
                        old->thread.fpu.last_cpu = cpu;
 
@@ -455,7 +455,7 @@ static inline fpu_switch_t switch_fpu_prepare(struct task_struct *old, struct ta
                        stts();
        } else {
                old->thread.fpu_counter = 0;
-               old->thread.fpu.last_cpu = ~0;
+               task_disable_lazy_fpu_restore(old);
                if (fpu.preload) {
                        new->thread.fpu_counter++;
                        if (!use_eager_fpu() && fpu_lazy_restore(new, cpu))

diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index f3ced6f..5722ab6 100644 (file)
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -236,7 +236,7 @@ int init_fpu(struct task_struct *tsk)
        if (tsk_used_math(tsk)) {
                if (cpu_has_fpu && tsk == current)
                        unlazy_fpu(tsk);
-               tsk->thread.fpu.last_cpu = ~0;
+               task_disable_lazy_fpu_restore(tsk);
                return 0;
        }
 

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index e127dda..ce8b103 100644 (file)
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -68,8 +68,8 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 
        dst->thread.fpu_counter = 0;
        dst->thread.fpu.has_fpu = 0;
-       dst->thread.fpu.last_cpu = ~0;
        dst->thread.fpu.state = NULL;
+       task_disable_lazy_fpu_restore(dst);
        if (tsk_used_math(src)) {
                int err = fpu_alloc(&dst->thread.fpu);
                if (err)