| /* |
| * Tracing hooks |
| * |
| * Copyright (C) 2008 Red Hat, Inc. All rights reserved. |
| * |
| * This copyrighted material is made available to anyone wishing to use, |
| * modify, copy, or redistribute it subject to the terms and conditions |
| * of the GNU General Public License v.2. |
| * |
| * This file defines hook entry points called by core code where |
| * user tracing/debugging support might need to do something. These |
| * entry points are called tracehook_*(). Each hook declared below |
| * has a detailed kerneldoc comment giving the context (locking et |
| * al) from which it is called, and the meaning of its return value. |
| * |
| * Each function here typically has only one call site, so it is ok |
| * to have some nontrivial tracehook_*() inlines. In all cases, the |
| * fast path when no tracing is enabled should be very short. |
| * |
| * The purpose of this file and the tracehook_* layer is to consolidate |
| * the interface that the kernel core and arch code uses to enable any |
| * user debugging or tracing facility (such as ptrace). The interfaces |
| * here are carefully documented so that maintainers of core and arch |
| * code do not need to think about the implementation details of the |
| * tracing facilities. Likewise, maintainers of the tracing code do not |
| * need to understand all the calling core or arch code in detail, just |
| * documented circumstances of each call, such as locking conditions. |
| * |
| * If the calling core code changes so that locking is different, then |
| * it is ok to change the interface documented here. The maintainer of |
| * core code changing should notify the maintainers of the tracing code |
| * that they need to work out the change. |
| * |
| * Some tracehook_*() inlines take arguments that the current tracing |
| * implementations might not necessarily use. These function signatures |
| * are chosen to pass in all the information that is on hand in the |
| * caller and might conceivably be relevant to a tracer, so that the |
| * core code won't have to be updated when tracing adds more features. |
| * If a call site changes so that some of those parameters are no longer |
| * already on hand without extra work, then the tracehook_* interface |
| * can change so there is no make-work burden on the core code. The |
| * maintainer of core code changing should notify the maintainers of the |
| * tracing code that they need to work out the change. |
| */ |
| |
| #ifndef _LINUX_TRACEHOOK_H |
| #define _LINUX_TRACEHOOK_H 1 |
| |
| #include <linux/sched.h> |
| #include <linux/ptrace.h> |
| |
| #endif /* <linux/tracehook.h> */ |