Commit-ID: 384a23f939912d368d2b42e1b41992be09aaf266
Gitweb: http://git.kernel.org/tip/384a23f939912d368d2b42e1b41992be09aaf266
Author: Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Thu, 23 Apr 2015 17:43:27 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 19 May 2015 15:47:27 +0200
x86/fpu: Use 'struct fpu' in switch_fpu_finish()
Migrate this function to pure 'struct fpu' usage.
Reviewed-by: Borislav Petkov <bp@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/include/asm/fpu-internal.h | 6 ++----
arch/x86/kernel/process_32.c | 10 ++++++----
arch/x86/kernel/process_64.c | 8 +++++---
3 files changed, 13 insertions(+), 11 deletions(-)
diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h
index 60d2c6f..5fd9b3f 100644
--- 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
--- 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
--- 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.
--
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