Revision ed48ece27cd3d5ee0354c32bbaec0f3e1d4715c3 authored by Tejun Heo on 18 September 2012, 19:48:43 UTC, committed by Tejun Heo on 19 September 2012, 17:13:12 UTC
The existing work_on_cpu() implementation is hugely inefficient. It
creates a new kthread, execute that single function and then let the
kthread die on each invocation.
Now that system_wq can handle concurrent executions, there's no
advantage of doing this. Reimplement work_on_cpu() using system_wq
which makes it simpler and way more efficient.
stable: While this isn't a fix in itself, it's needed to fix a
workqueue related bug in cpufreq/powernow-k8. AFAICS, this
shouldn't break other existing users.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: stable@vger.kernel.org
1 parent 960bd11
m5mols.h
/*
* Driver header for M-5MOLS 8M Pixel camera sensor with ISP
*
* Copyright (C) 2011 Samsung Electronics Co., Ltd.
* Author: HeungJun Kim <riverful.kim@samsung.com>
*
* Copyright (C) 2009 Samsung Electronics Co., Ltd.
* Author: Dongsoo Nathaniel Kim <dongsoo45.kim@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef MEDIA_M5MOLS_H
#define MEDIA_M5MOLS_H
/**
* struct m5mols_platform_data - platform data for M-5MOLS driver
* @gpio_reset: GPIO driving the reset pin of M-5MOLS
* @reset_polarity: active state for gpio_reset pin, 0 or 1
* @set_power: an additional callback to the board setup code
* to be called after enabling and before disabling
* the sensor's supply regulators
*/
struct m5mols_platform_data {
int gpio_reset;
u8 reset_polarity;
int (*set_power)(struct device *dev, int on);
};
#endif /* MEDIA_M5MOLS_H */
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