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| author | Ingo Molnar <mingo@kernel.org> | 2015-04-03 11:58:52 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 16:47:09 +0300 |
| commit | 0a7815515471a80379bfefc9f1913e0d8c87fbfb (patch) | |
| tree | fa38248d7808b7526c7fd80b130f92d1b76eaf5b | |
| parent | e26081808edadfd257c6c9d81014e3b25e9a6118 (diff) | |
| download | linux-0a7815515471a80379bfefc9f1913e0d8c87fbfb.tar.xz | |
x86/fpu: Rename unlazy_fpu() to fpu__save()
This function is a misnomer on two levels:
1) it doesn't really manipulate TS on modern CPUs anymore, its
primary purpose is to save FPU state, used:
- when executing fork()/clone(): to copy current FPU state
to the child's FPU state.
- when handling math exceptions: to generate the math error
si_code in the signal frame.
2) even on legacy CPUs it doesn't actually 'unlazy', if then
it lazies the FPU state: as a side effect of the old FNSAVE
instruction which clears (destroys) FPU state it's necessary
to set CR0::TS.
So rename it to fpu__save() to better reflect its purpose.
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>
| -rw-r--r-- | arch/x86/include/asm/fpu-internal.h | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/i387.h | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/i387.c | 6 | ||||
| -rw-r--r-- | arch/x86/kernel/traps.c | 2 |
4 files changed, 6 insertions, 6 deletions
diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h index da5e96756570..49db0440b0ed 100644 --- a/arch/x86/include/asm/fpu-internal.h +++ b/arch/x86/include/asm/fpu-internal.h @@ -602,7 +602,7 @@ static inline void fpu_copy(struct task_struct *dst, struct task_struct *src) struct fpu *dfpu = &dst->thread.fpu; struct fpu *sfpu = &src->thread.fpu; - unlazy_fpu(src); + fpu__save(src); memcpy(dfpu->state, sfpu->state, xstate_size); } } diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h index 6eb6fcb83f63..d4419da9b210 100644 --- a/arch/x86/include/asm/i387.h +++ b/arch/x86/include/asm/i387.h @@ -101,7 +101,7 @@ static inline int user_has_fpu(void) return current->thread.fpu.has_fpu; } -extern void unlazy_fpu(struct task_struct *tsk); +extern void fpu__save(struct task_struct *tsk); #endif /* __ASSEMBLY__ */ diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c index 009183276bb7..ec1a744eb853 100644 --- a/arch/x86/kernel/i387.c +++ b/arch/x86/kernel/i387.c @@ -117,7 +117,7 @@ void __kernel_fpu_end(void) } EXPORT_SYMBOL(__kernel_fpu_end); -void unlazy_fpu(struct task_struct *tsk) +void fpu__save(struct task_struct *tsk) { preempt_disable(); if (__thread_has_fpu(tsk)) { @@ -130,7 +130,7 @@ void unlazy_fpu(struct task_struct *tsk) } preempt_enable(); } -EXPORT_SYMBOL(unlazy_fpu); +EXPORT_SYMBOL(fpu__save); unsigned int mxcsr_feature_mask __read_mostly = 0xffffffffu; unsigned int xstate_size; @@ -251,7 +251,7 @@ int init_fpu(struct task_struct *tsk) if (tsk_used_math(tsk)) { if (cpu_has_fpu && tsk == current) - unlazy_fpu(tsk); + fpu__save(tsk); task_disable_lazy_fpu_restore(tsk); return 0; } diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 324ab5247687..12f29f9907cd 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -731,7 +731,7 @@ static void math_error(struct pt_regs *regs, int error_code, int trapnr) /* * Save the info for the exception handler and clear the error. */ - unlazy_fpu(task); + fpu__save(task); task->thread.trap_nr = trapnr; task->thread.error_code = error_code; info.si_signo = SIGFPE; |