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From: Michal Hocko <mhocko@kernel.org>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"David S. Miller" <davem@davemloft.net>,
	Tony Luck <tony.luck@intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Chris Zankel <chris@zankel.net>,
	Max Filippov <jcmvbkbc@gmail.com>,
	x86@kernel.org, linux-alpha@vger.kernel.org,
	linux-ia64@vger.kernel.org, linux-s390@vger.kernel.org,
	linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
	linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org,
	Michal Hocko <mhocko@suse.com>
Subject: [RFC 07/12] sh, rwsem: provide __down_write_killable
Date: Tue, 02 Feb 2016 20:19:24 +0000	[thread overview]
Message-ID: <1454444369-2146-8-git-send-email-mhocko@kernel.org> (raw)
In-Reply-To: <1454444369-2146-1-git-send-email-mhocko@kernel.org>

From: Michal Hocko <mhocko@suse.com>

which is uses the same fast path as __down_write except it falls back to
rwsem_down_write_failed_killable slow path and return -EINTR if killed.

Signed-off-by: Michal Hocko <mhocko@suse.com>
---
 arch/sh/include/asm/rwsem.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/sh/include/asm/rwsem.h b/arch/sh/include/asm/rwsem.h
index f6c951c7a875..8a457b83d2a5 100644
--- a/arch/sh/include/asm/rwsem.h
+++ b/arch/sh/include/asm/rwsem.h
@@ -54,6 +54,19 @@ static inline void __down_write(struct rw_semaphore *sem)
 		rwsem_down_write_failed(sem);
 }
 
+static inline int __down_write_killable(struct rw_semaphore *sem)
+{
+	int tmp;
+
+	tmp = atomic_add_return(RWSEM_ACTIVE_WRITE_BIAS,
+				(atomic_t *)(&sem->count));
+	if (tmp != RWSEM_ACTIVE_WRITE_BIAS)
+		if (IS_ERR(rwsem_down_write_failed_killable(sem)))
+			return -EINTR;
+
+	return 0;
+}
+
 static inline int __down_write_trylock(struct rw_semaphore *sem)
 {
 	int tmp;
-- 
2.7.0


WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@kernel.org>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"David S. Miller" <davem@davemloft.net>,
	Tony Luck <tony.luck@intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Chris Zankel <chris@zankel.net>,
	Max Filippov <jcmvbkbc@gmail.com>,
	x86@kernel.org, linux-alpha@vger.kernel.org,
	linux-ia64@vger.kernel.org, linux-s390@vger.kernel.org,
	linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
	linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org,
	Michal Hocko <mhocko@suse.com>
Subject: [RFC 07/12] sh, rwsem: provide __down_write_killable
Date: Tue,  2 Feb 2016 21:19:24 +0100	[thread overview]
Message-ID: <1454444369-2146-8-git-send-email-mhocko@kernel.org> (raw)
In-Reply-To: <1454444369-2146-1-git-send-email-mhocko@kernel.org>

From: Michal Hocko <mhocko@suse.com>

which is uses the same fast path as __down_write except it falls back to
rwsem_down_write_failed_killable slow path and return -EINTR if killed.

Signed-off-by: Michal Hocko <mhocko@suse.com>
---
 arch/sh/include/asm/rwsem.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/sh/include/asm/rwsem.h b/arch/sh/include/asm/rwsem.h
index f6c951c7a875..8a457b83d2a5 100644
--- a/arch/sh/include/asm/rwsem.h
+++ b/arch/sh/include/asm/rwsem.h
@@ -54,6 +54,19 @@ static inline void __down_write(struct rw_semaphore *sem)
 		rwsem_down_write_failed(sem);
 }
 
+static inline int __down_write_killable(struct rw_semaphore *sem)
+{
+	int tmp;
+
+	tmp = atomic_add_return(RWSEM_ACTIVE_WRITE_BIAS,
+				(atomic_t *)(&sem->count));
+	if (tmp != RWSEM_ACTIVE_WRITE_BIAS)
+		if (IS_ERR(rwsem_down_write_failed_killable(sem)))
+			return -EINTR;
+
+	return 0;
+}
+
 static inline int __down_write_trylock(struct rw_semaphore *sem)
 {
 	int tmp;
-- 
2.7.0

  parent reply	other threads:[~2016-02-02 20:19 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-02 20:19 [RFC 0/12] introduce down_write_killable for rw_semaphore Michal Hocko
2016-02-02 20:19 ` Michal Hocko
2016-02-02 20:19 ` [RFC 01/12] locking, rwsem: get rid of __down_write_nested Michal Hocko
2016-02-02 20:19   ` Michal Hocko
2016-02-02 20:19 ` [RFC 02/12] locking, rwsem: drop explicit memory barriers Michal Hocko
2016-02-02 20:19   ` Michal Hocko
2016-02-02 20:19 ` [RFC 03/12] locking, rwsem: introduce basis for down_write_killable Michal Hocko
2016-02-02 20:19   ` Michal Hocko
2016-02-02 20:19 ` [RFC 04/12] alpha, rwsem: provide __down_write_killable Michal Hocko
2016-02-02 20:19   ` Michal Hocko
2016-02-02 20:19 ` [RFC 05/12] ia64, " Michal Hocko
2016-02-02 20:19   ` Michal Hocko
2016-02-02 20:19 ` [RFC 06/12] s390, " Michal Hocko
2016-02-02 20:19   ` Michal Hocko
2016-02-02 20:19 ` Michal Hocko [this message]
2016-02-02 20:19   ` [RFC 07/12] sh, " Michal Hocko
2016-02-03 11:19   ` Sergei Shtylyov
2016-02-03 11:19     ` Sergei Shtylyov
2016-02-03 12:11     ` Michal Hocko
2016-02-03 12:11       ` Michal Hocko
2016-02-02 20:19 ` [RFC 08/12] sparc, " Michal Hocko
2016-02-02 20:19   ` Michal Hocko
2016-02-02 20:19 ` [RFC 09/12] xtensa, " Michal Hocko
2016-02-02 20:19   ` Michal Hocko
2016-02-02 20:19 ` [RFC 10/12] x86, rwsem: simplify __down_write Michal Hocko
2016-02-02 20:19   ` Michal Hocko
2016-02-03  8:10   ` Ingo Molnar
2016-02-03  8:10     ` Ingo Molnar
2016-02-03 12:10     ` Michal Hocko
2016-02-03 12:10       ` Michal Hocko
2016-06-03 16:13     ` Peter Zijlstra
2016-06-03 16:13       ` Peter Zijlstra
2016-06-03 22:34       ` Peter Zijlstra
2016-06-03 22:34         ` Peter Zijlstra
2016-06-09 14:40       ` David Howells
2016-06-09 14:40         ` David Howells
2016-06-09 17:36         ` Peter Zijlstra
2016-06-09 17:36           ` Peter Zijlstra
2016-06-10 16:39           ` Paul E. McKenney
2016-06-10 16:39             ` Paul E. McKenney
2016-02-02 20:19 ` [RFC 11/12] x86, rwsem: provide __down_write_killable Michal Hocko
2016-02-02 20:19   ` Michal Hocko
2016-02-17 16:41   ` [RFC 11/12 v1] " Michal Hocko
2016-02-17 16:41     ` Michal Hocko
2016-02-17 16:41     ` Michal Hocko
2016-02-17 16:41     ` Michal Hocko
2016-02-02 20:19 ` [RFC 12/12] locking, rwsem: provide down_write_killable Michal Hocko
2016-02-02 20:19   ` Michal Hocko
2016-02-19 12:15 ` [RFC 0/12] introduce down_write_killable for rw_semaphore Michal Hocko
2016-02-19 12:15   ` Michal Hocko
2016-03-09 12:18 ` Ingo Molnar
2016-03-09 12:18   ` Ingo Molnar
2016-03-09 12:56   ` Michal Hocko
2016-03-09 12:56     ` Michal Hocko
2016-03-09 13:17     ` Ingo Molnar
2016-03-09 13:17       ` Ingo Molnar
2016-03-09 13:28       ` Michal Hocko
2016-03-09 13:28         ` Michal Hocko
2016-03-09 13:43         ` Ingo Molnar
2016-03-09 13:43           ` Ingo Molnar
2016-03-09 14:41           ` Michal Hocko
2016-03-09 14:41             ` Michal Hocko
2016-03-10 10:24             ` Ingo Molnar
2016-03-10 10:24               ` Ingo Molnar

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