Messages in this thread Patch in this message | | | From | Ingo Molnar <> | Subject | [PATCH 013/208] x86/fpu: Rename fpu_alloc() to fpstate_alloc() | Date | Tue, 5 May 2015 18:23:53 +0200 |
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Use the fpu__*() namespace for fpstate_alloc() as well.
Also add a comment about FPU state alignment.
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: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org> --- arch/x86/include/asm/fpu-internal.h | 2 +- arch/x86/kernel/i387.c | 12 ++++++++---- arch/x86/kernel/process.c | 2 +- arch/x86/kvm/x86.c | 2 +- 4 files changed, 11 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h index bdbba1a4de69..88f584ab3463 100644 --- a/arch/x86/include/asm/fpu-internal.h +++ b/arch/x86/include/asm/fpu-internal.h @@ -569,7 +569,7 @@ static inline unsigned short get_fpu_mxcsr(struct task_struct *tsk) } } -extern int fpu_alloc(struct fpu *fpu); +extern int fpstate_alloc(struct fpu *fpu); static inline void fpu_free(struct fpu *fpu) { diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c index 05fcc90087b0..5f2feb63b72a 100644 --- a/arch/x86/kernel/i387.c +++ b/arch/x86/kernel/i387.c @@ -246,17 +246,21 @@ void fpu_finit(struct fpu *fpu) } EXPORT_SYMBOL_GPL(fpu_finit); -int fpu_alloc(struct fpu *fpu) +int fpstate_alloc(struct fpu *fpu) { if (fpu->state) return 0; + fpu->state = kmem_cache_alloc(task_xstate_cachep, GFP_KERNEL); if (!fpu->state) return -ENOMEM; + + /* The CPU requires the FPU state to be aligned to 16 byte boundaries: */ WARN_ON((unsigned long)fpu->state & 15); + return 0; } -EXPORT_SYMBOL_GPL(fpu_alloc); +EXPORT_SYMBOL_GPL(fpstate_alloc); /* * Allocate the backing store for the current task's FPU registers @@ -276,7 +280,7 @@ int fpstate_alloc_init(struct task_struct *curr) /* * Memory allocation at the first usage of the FPU and other state. */ - ret = fpu_alloc(&curr->thread.fpu); + ret = fpstate_alloc(&curr->thread.fpu); if (ret) return ret; @@ -310,7 +314,7 @@ static int fpu__unlazy_stopped(struct task_struct *child) /* * Memory allocation at the first usage of the FPU and other state. */ - ret = fpu_alloc(&child->thread.fpu); + ret = fpstate_alloc(&child->thread.fpu); if (ret) return ret; diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index e2220e38ff6d..7b54c81403d5 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -92,7 +92,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) dst->thread.fpu.state = NULL; task_disable_lazy_fpu_restore(dst); if (tsk_used_math(src)) { - int err = fpu_alloc(&dst->thread.fpu); + int err = fpstate_alloc(&dst->thread.fpu); if (err) return err; fpu_copy(dst, src); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index bfc396632ee8..28fa733bb1c6 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -7007,7 +7007,7 @@ int fx_init(struct kvm_vcpu *vcpu) { int err; - err = fpu_alloc(&vcpu->arch.guest_fpu); + err = fpstate_alloc(&vcpu->arch.guest_fpu); if (err) return err; -- 2.1.0
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