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| author | Ingo Molnar <mingo@kernel.org> | 2015-04-22 15:47:05 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 15:47:19 +0200 |
| commit | a752b53d9dcbae28a3a22b5577f0571acf53d5aa (patch) | |
| tree | 875b53eb3ec80ef232326065a7c617d70a2da218 /arch/x86 | |
| parent | 8ffb53ab986ccb4421b1060182c6e084edd7b9d8 (diff) | |
| download | linux-a752b53d9dcbae28a3a22b5577f0571acf53d5aa.tar.gz | |
x86/fpu: Factor out fpu__copy()
Introduce fpu__copy() and use it in arch_dup_task_struct(), thus moving another chunk of FPU logic to fpu/core.c. 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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/fpu-internal.h | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/fpu/core.c | 18 | ||||
| -rw-r--r-- | arch/x86/kernel/process.c | 12 |
3 files changed, 20 insertions, 11 deletions
diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h index f41170c6d376..6c1ceb7c3f9a 100644 --- a/arch/x86/include/asm/fpu-internal.h +++ b/arch/x86/include/asm/fpu-internal.h @@ -567,6 +567,7 @@ static inline unsigned short get_fpu_mxcsr(struct task_struct *tsk) extern void fpstate_cache_init(void); extern int fpstate_alloc(struct fpu *fpu); +extern int fpu__copy(struct task_struct *dst, struct task_struct *src); static inline void fpstate_free(struct fpu *fpu) { diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c index b32a6eb7f189..05df212449ed 100644 --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -178,6 +178,24 @@ int fpstate_alloc(struct fpu *fpu) } EXPORT_SYMBOL_GPL(fpstate_alloc); +int fpu__copy(struct task_struct *dst, struct task_struct *src) +{ + dst->thread.fpu.counter = 0; + dst->thread.fpu.has_fpu = 0; + dst->thread.fpu.state = NULL; + + task_disable_lazy_fpu_restore(dst); + + if (tsk_used_math(src)) { + int err = fpstate_alloc(&dst->thread.fpu); + + if (err) + return err; + fpu_copy(dst, src); + } + return 0; +} + /* * Allocate the backing store for the current task's FPU registers * and initialize the registers themselves as well. diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 36d9f737f278..bb7d4abcdad6 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -83,17 +83,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) { *dst = *src; - dst->thread.fpu.counter = 0; - dst->thread.fpu.has_fpu = 0; - dst->thread.fpu.state = NULL; - task_disable_lazy_fpu_restore(dst); - if (tsk_used_math(src)) { - int err = fpstate_alloc(&dst->thread.fpu); - if (err) - return err; - fpu_copy(dst, src); - } - return 0; + return fpu__copy(dst, src); } void arch_release_task_struct(struct task_struct *tsk) |