From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760156AbbEEQ6o (ORCPT ); Tue, 5 May 2015 12:58:44 -0400 Received: from mail-wi0-f176.google.com ([209.85.212.176]:33714 "EHLO mail-wi0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760894AbbEEQ2k (ORCPT ); Tue, 5 May 2015 12:28:40 -0400 From: Ingo Molnar To: linux-kernel@vger.kernel.org Cc: Andy Lutomirski , Borislav Petkov , Dave Hansen , Fenghua Yu , "H. Peter Anvin" , Linus Torvalds , Oleg Nesterov , Thomas Gleixner Subject: [PATCH 035/208] x86/fpu: Factor out fpu__copy() Date: Tue, 5 May 2015 18:24:15 +0200 Message-Id: <1430843228-13749-36-git-send-email-mingo@kernel.org> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1430843228-13749-1-git-send-email-mingo@kernel.org> References: <1430843228-13749-1-git-send-email-mingo@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Cc: Andy Lutomirski Cc: Dave Hansen Cc: Fenghua Yu Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Oleg Nesterov Cc: Thomas Gleixner Signed-off-by: Ingo Molnar --- arch/x86/include/asm/fpu-internal.h | 1 + arch/x86/kernel/fpu/core.c | 18 ++++++++++++++++++ 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 9dc4bb3f6f5a..e02c42965f53 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 fda613eeeebd..1b4ea12e412d 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) -- 2.1.0