From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Martin Subject: [PATCH v7 01/16] thread_info: Add update_thread_flag() helpers Date: Wed, 9 May 2018 17:12:50 +0100 Message-ID: <1525882385-29181-2-git-send-email-Dave.Martin@arm.com> References: <1525882385-29181-1-git-send-email-Dave.Martin@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 86B774A0E8 for ; Wed, 9 May 2018 12:04:19 -0400 (EDT) Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mmv+Ml-nQozu for ; Wed, 9 May 2018 12:03:56 -0400 (EDT) Received: from foss.arm.com (foss.arm.com [217.140.101.70]) by mm01.cs.columbia.edu (Postfix) with ESMTP id C453F4A0CC for ; Wed, 9 May 2018 12:03:51 -0400 (EDT) In-Reply-To: <1525882385-29181-1-git-send-email-Dave.Martin@arm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: kvmarm@lists.cs.columbia.edu Cc: Christoffer Dall , Ard Biesheuvel , Marc Zyngier , Catalin Marinas , Oleg Nesterov , Peter Zijlstra , Ingo Molnar , linux-arm-kernel@lists.infradead.org List-Id: kvmarm@lists.cs.columbia.edu There are a number of bits of code sprinkled around the kernel to set a thread flag if a certain condition is true, and clear it otherwise. To help make those call sites terser and less cumbersome, this patch adds a new family of thread flag manipulators update*_thread_flag([...,] flag, cond) which do the equivalent of: if (cond) set*_thread_flag([...,] flag); else clear*_thread_flag([...,] flag); Signed-off-by: Dave Martin Acked-by: Steven Rostedt (VMware) Acked-by: Marc Zyngier Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Oleg Nesterov --- include/linux/sched.h | 6 ++++++ include/linux/thread_info.h | 11 +++++++++++ 2 files changed, 17 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index b3d697f..c2c3051 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1578,6 +1578,12 @@ static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) clear_ti_thread_flag(task_thread_info(tsk), flag); } +static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag, + bool value) +{ + update_ti_thread_flag(task_thread_info(tsk), flag, value); +} + static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) { return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h index cf2862b..8d8821b 100644 --- a/include/linux/thread_info.h +++ b/include/linux/thread_info.h @@ -60,6 +60,15 @@ static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) clear_bit(flag, (unsigned long *)&ti->flags); } +static inline void update_ti_thread_flag(struct thread_info *ti, int flag, + bool value) +{ + if (value) + set_ti_thread_flag(ti, flag); + else + clear_ti_thread_flag(ti, flag); +} + static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) { return test_and_set_bit(flag, (unsigned long *)&ti->flags); @@ -79,6 +88,8 @@ static inline int test_ti_thread_flag(struct thread_info *ti, int flag) set_ti_thread_flag(current_thread_info(), flag) #define clear_thread_flag(flag) \ clear_ti_thread_flag(current_thread_info(), flag) +#define update_thread_flag(flag, value) \ + update_ti_thread_flag(current_thread_info(), flag, value) #define test_and_set_thread_flag(flag) \ test_and_set_ti_thread_flag(current_thread_info(), flag) #define test_and_clear_thread_flag(flag) \ -- 2.1.4