1 /*- 2 * Copyright (c) 2017 Mark Johnston <markj@FreeBSD.org> 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in 11 * the documentation and/or other materials provided with the 12 * distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef _LINUXKPI_LINUX_SMP_H_ 30 #define _LINUXKPI_LINUX_SMP_H_ 31 32 /* 33 * Important note about the use of the function provided below: 34 * 35 * The callback function passed to on_each_cpu() is called from a 36 * so-called critical section, and if you need a mutex you will have 37 * to rewrite the code to use native FreeBSD mtx spinlocks instead of 38 * the spinlocks provided by the LinuxKPI! Be very careful to not call 39 * any LinuxKPI functions inside the on_each_cpu()'s callback 40 * function, because they may sleep, unlike in native Linux. 41 * 42 * Enabling witness(4) when testing, can catch such issues. 43 */ 44 #define on_each_cpu(cb, data, wait) ({ \ 45 CTASSERT(wait); \ 46 linux_on_each_cpu(cb, data); \ 47 }) 48 49 extern int linux_on_each_cpu(void (*)(void *), void *); 50 51 #endif /* _LINUXKPI_LINUX_SMP_H_ */ 52