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Edit File: drm_util.h

/* * Internal Header for the Direct Rendering Manager * * Copyright 2018 Intel Corporation * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ #ifndef _DRM_UTIL_H_ #define _DRM_UTIL_H_ /** * DOC: drm utils * * Macros and inline functions that does not naturally belong in other places */ #include <linux/interrupt.h> #include <linux/kgdb.h> #include <linux/preempt.h> #include <linux/smp.h> /* * Use EXPORT_SYMBOL_FOR_TESTS_ONLY() for functions that shall * only be visible for drmselftests. */ #if defined(CONFIG_DRM_EXPORT_FOR_TESTS) #define EXPORT_SYMBOL_FOR_TESTS_ONLY(x) EXPORT_SYMBOL(x) #else #define EXPORT_SYMBOL_FOR_TESTS_ONLY(x) #endif /** * for_each_if - helper for handling conditionals in various for_each macros * @condition: The condition to check * * Typical use:: * * #define for_each_foo_bar(x, y) \' * list_for_each_entry(x, y->list, head) \' * for_each_if(x->something == SOMETHING) * * The for_each_if() macro makes the use of for_each_foo_bar() less error * prone. */ #define for_each_if(condition) if (!(condition)) {} else /** * drm_can_sleep - returns true if currently okay to sleep * * This function shall not be used in new code. * The check for running in atomic context may not work - see linux/preempt.h. * * FIXME: All users of drm_can_sleep should be removed (see todo.rst) * * Returns: * False if kgdb is active, we are in atomic context or irqs are disabled. */ static inline bool drm_can_sleep(void) { if (in_atomic() || in_dbg_master() || irqs_disabled()) return false; return true; } #endif