[PATCH 051/208] x86/fpu: Remove 'struct task_struct' usage from __thread_fpu_begin()

[Ingo Molnar]

Migrate this function to pure 'struct fpu' usage.

Reviewed-by: Borislav Petkov <b...@alien8.de>
Cc: Andy Lutomirski <l...@amacapital.net>
Cc: Dave Hansen <dave.han...@linux.intel.com>
Cc: Fenghua Yu <fenghua...@intel.com>
Cc: H. Peter Anvin <h...@zytor.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Oleg Nesterov <o...@redhat.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: Ingo Molnar <mi...@kernel.org>
---
 arch/x86/include/asm/fpu-internal.h | 10 ++++++----
 arch/x86/kernel/fpu/core.c          |  3 ++-
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/fpu-internal.h 
b/arch/x86/include/asm/fpu-internal.h
index b1803a656651..44516ad6c890 100644
--- a/arch/x86/include/asm/fpu-internal.h
+++ b/arch/x86/include/asm/fpu-internal.h
@@ -351,11 +351,11 @@ static inline void __thread_fpu_end(struct fpu *fpu)
                stts();
 }
 
-static inline void __thread_fpu_begin(struct task_struct *tsk)
+static inline void __thread_fpu_begin(struct fpu *fpu)
 {
        if (!use_eager_fpu())
                clts();
-       __thread_set_has_fpu(&tsk->thread.fpu);
+       __thread_set_has_fpu(fpu);
 }
 
 static inline void drop_fpu(struct task_struct *tsk)
@@ -451,7 +451,7 @@ static inline fpu_switch_t switch_fpu_prepare(struct 
task_struct *old, struct ta
                                fpu.preload = 0;
                        else
                                prefetch(new->thread.fpu.state);
-                       __thread_fpu_begin(new);
+                       __thread_fpu_begin(new_fpu);
                }
        }
        return fpu;
@@ -505,9 +505,11 @@ static inline int restore_xstate_sig(void __user *buf, int 
ia32_frame)
  */
 static inline void user_fpu_begin(void)
 {
+       struct fpu *fpu = &current->thread.fpu;
+
        preempt_disable();
        if (!user_has_fpu())
-               __thread_fpu_begin(current);
+               __thread_fpu_begin(fpu);
        preempt_enable();
 }
 
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 96d175101cd8..275bdb768895 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -329,6 +329,7 @@ static int fpu__unlazy_stopped(struct task_struct *child)
 void fpu__restore(void)
 {
        struct task_struct *tsk = current;
+       struct fpu *fpu = &tsk->thread.fpu;
 
        if (!tsk_used_math(tsk)) {
                local_irq_enable();
@@ -347,7 +348,7 @@ void fpu__restore(void)
 
        /* Avoid __kernel_fpu_begin() right after __thread_fpu_begin() */
        kernel_fpu_disable();
-       __thread_fpu_begin(tsk);
+       __thread_fpu_begin(fpu);
        if (unlikely(restore_fpu_checking(tsk))) {
                fpu_reset_state(tsk);
                force_sig_info(SIGSEGV, SEND_SIG_PRIV, tsk);
-- 
2.1.0

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