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From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: akpm@linux-foundation.org
Cc: mingo@redhat.com, peterz@infradead.org, keescook@chromium.org,
	dmitry.torokhov@gmail.com, jeyu@redhat.com,
	rusty@rustcorp.com.au, mmarek@suse.com, pmladek@suse.com,
	mbenes@suse.cz, jpoimboe@redhat.com, ebiederm@xmission.com,
	shuah@kernel.org, matt.redfearn@imgtec.com,
	dan.carpenter@oracle.com, colin.king@canonical.com,
	danielmentz@google.com, dcb314@hotmail.com,
	linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
	"Luis R. Rodriguez" <mcgrof@kernel.org>
Subject: [PATCH 1/3] wait: add wait_event_killable_timeout()
Date: Wed,  9 Aug 2017 16:46:33 -0700
Message-ID: <20170809234635.13443-2-mcgrof@kernel.org> (raw)
In-Reply-To: <20170809234635.13443-1-mcgrof@kernel.org>

This wait is similar to wait_event_interruptable_timeout() but only accepts
SIGKILL interrupt signal. Other signals are ignored.

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
---
 include/linux/wait.h | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/include/linux/wait.h b/include/linux/wait.h
index 5b74e36c0ca8..dc19880c02f5 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -757,6 +757,43 @@ extern int do_wait_intr_irq(wait_queue_head_t *, wait_queue_entry_t *);
 	__ret;									\
 })
 
+#define __wait_event_killable_timeout(wq_head, condition, timeout)		\
+	___wait_event(wq_head, ___wait_cond_timeout(condition),			\
+		      TASK_KILLABLE, 0, timeout,				\
+		      __ret = schedule_timeout(__ret))
+
+/**
+ * wait_event_killable_timeout - sleep until a condition gets true or a timeout elapses
+ * @wq_head: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ * @timeout: timeout, in jiffies
+ *
+ * The process is put to sleep (TASK_KILLABLE) until the
+ * @condition evaluates to true or a kill signal is received.
+ * The @condition is checked each time the waitqueue @wq_head is woken up.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ *
+ * Returns:
+ * 0 if the @condition evaluated to %false after the @timeout elapsed,
+ * 1 if the @condition evaluated to %true after the @timeout elapsed,
+ * the remaining jiffies (at least 1) if the @condition evaluated
+ * to %true before the @timeout elapsed, or -%ERESTARTSYS if it was
+ * interrupted by a kill signal.
+ *
+ * Only kill signals interrupt this process.
+ */
+#define wait_event_killable_timeout(wq_head, condition, timeout)		\
+({										\
+	long __ret = timeout;							\
+	might_sleep();								\
+	if (!___wait_cond_timeout(condition))					\
+		__ret = __wait_event_killable_timeout(wq_head,			\
+						condition, timeout);		\
+	__ret;									\
+})
+
 
 #define __wait_event_lock_irq(wq_head, condition, lock, cmd)			\
 	(void)___wait_event(wq_head, condition, TASK_UNINTERRUPTIBLE, 0, 0,	\
-- 
2.14.0

  reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-09 23:46 [PATCH 0/3] kmod: pending fixes for v4.13-final Luis R. Rodriguez
2017-08-09 23:46 ` Luis R. Rodriguez [this message]
2017-08-10 10:33   ` [PATCH 1/3] wait: add wait_event_killable_timeout() Peter Zijlstra
2017-08-09 23:46 ` [PATCH 2/3] kmod: fix wait on recursive loop Luis R. Rodriguez
2017-08-09 23:46 ` [PATCH 3/3] test_kmod: fix description for -s -and -c parameters Luis R. Rodriguez

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