FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/smp.h

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

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