From: "Robert P. J. Day" <rpjday@crashcourse.ca>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: backwards busy wait using "time_before()"??
Date: Thu, 31 Dec 2009 11:40:42 -0500 (EST) [thread overview]
Message-ID: <alpine.LFD.2.00.0912311136560.3596@localhost> (raw)
if this is an idiotic question, i'll blame it on the fact that
there's only decaf left in the house.
from drivers/spi/spi_stmp.c:
#define busy_wait(cond) \
({ \
unsigned long end_jiffies = jiffies + STMP_SPI_TIMEOUT; \
bool succeeded = false; \
do { \
if (cond) { \
succeeded = true; \
break; \
} \
cpu_relax(); \
} while (time_before(end_jiffies, jiffies)); \
succeeded; \
})
is it just me, or do those arguments to time_before() look
backwards?
rday
--
========================================================================
Robert P. J. Day Waterloo, Ontario, CANADA
Linux Consulting, Training and Kernel Pedantry.
Web page: http://crashcourse.ca
Twitter: http://twitter.com/rpjday
========================================================================
next reply other threads:[~2009-12-31 16:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-31 16:40 Robert P. J. Day [this message]
2009-12-31 19:23 ` backwards busy wait using "time_before()"?? Robert P. J. Day
2010-01-01 15:17 ` Andi Kleen
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