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51 lines
2.1 KiB
C
51 lines
2.1 KiB
C
/*-
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* Copyright (c) 2017 Mark Johnston <markj@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _LINUXKPI_LINUX_SMP_H_
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#define _LINUXKPI_LINUX_SMP_H_
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#include <asm/smp.h>
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/*
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* Important note about the use of the function provided below:
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*
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* The callback function passed to on_each_cpu() is called from a
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* so-called critical section, and if you need a mutex you will have
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* to rewrite the code to use native FreeBSD mtx spinlocks instead of
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* the spinlocks provided by the LinuxKPI! Be very careful to not call
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* any LinuxKPI functions inside the on_each_cpu()'s callback
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* function, because they may sleep, unlike in native Linux.
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*
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* Enabling witness(4) when testing, can catch such issues.
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*/
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#define on_each_cpu(cb, data, wait) ({ \
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CTASSERT(wait); \
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linux_on_each_cpu(cb, data); \
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})
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extern int linux_on_each_cpu(void (*)(void *), void *);
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#endif /* _LINUXKPI_LINUX_SMP_H_ */
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