x86/fpu: Use 'struct fpu' in switch_fpu_finish()

Migrate this function to pure 'struct fpu' usage.

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>

diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h
index 60d2c6f..5fd9b3f 100644 (file)
--- a/arch/x86/include/asm/fpu-internal.h
+++ b/arch/x86/include/asm/fpu-internal.h
@@ -451,11 +451,9 @@ switch_fpu_prepare(struct fpu *old_fpu, struct fpu *new_fpu, int cpu)
  * state - all we need to do is to conditionally restore the register
  * state itself.
  */
-static inline void switch_fpu_finish(struct task_struct *new, fpu_switch_t fpu)
+static inline void switch_fpu_finish(struct fpu *new_fpu, fpu_switch_t fpu_switch)
 {
-       struct fpu *new_fpu = &new->thread.fpu;
-
-       if (fpu.preload) {
+       if (fpu_switch.preload) {
                if (unlikely(restore_fpu_checking(new_fpu)))
                        fpu_reset_state(new_fpu);
        }

diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 5b0ed71..7adc314 100644 (file)
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -241,14 +241,16 @@ __visible __notrace_funcgraph struct task_struct *
 __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
 {
        struct thread_struct *prev = &prev_p->thread,
-                                *next = &next_p->thread;
+                            *next = &next_p->thread;
+       struct fpu *prev_fpu = &prev->fpu;
+       struct fpu *next_fpu = &next->fpu;
        int cpu = smp_processor_id();
        struct tss_struct *tss = &per_cpu(cpu_tss, cpu);
-       fpu_switch_t fpu;
+       fpu_switch_t fpu_switch;
 
        /* never put a printk in __switch_to... printk() calls wake_up*() indirectly */
 
-       fpu = switch_fpu_prepare(&prev_p->thread.fpu, &next_p->thread.fpu, cpu);
+       fpu_switch = switch_fpu_prepare(prev_fpu, next_fpu, cpu);
 
        /*
         * Save away %gs. No need to save %fs, as it was saved on the
@@ -318,7 +320,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
        if (prev->gs | next->gs)
                lazy_load_gs(next->gs);
 
-       switch_fpu_finish(next_p, fpu);
+       switch_fpu_finish(next_fpu, fpu_switch);
 
        this_cpu_write(current_task, next_p);
 

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index fefe65e..4504569 100644 (file)
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -273,12 +273,14 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
 {
        struct thread_struct *prev = &prev_p->thread;
        struct thread_struct *next = &next_p->thread;
+       struct fpu *prev_fpu = &prev->fpu;
+       struct fpu *next_fpu = &next->fpu;
        int cpu = smp_processor_id();
        struct tss_struct *tss = &per_cpu(cpu_tss, cpu);
        unsigned fsindex, gsindex;
-       fpu_switch_t fpu;
+       fpu_switch_t fpu_switch;
 
-       fpu = switch_fpu_prepare(&prev_p->thread.fpu, &next_p->thread.fpu, cpu);
+       fpu_switch = switch_fpu_prepare(prev_fpu, next_fpu, cpu);
 
        /* We must save %fs and %gs before load_TLS() because
         * %fs and %gs may be cleared by load_TLS().
@@ -390,7 +392,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
                wrmsrl(MSR_KERNEL_GS_BASE, next->gs);
        prev->gsindex = gsindex;
 
-       switch_fpu_finish(next_p, fpu);
+       switch_fpu_finish(next_fpu, fpu_switch);
 
        /*
         * Switch the PDA and FPU contexts.