At this point, tracehooks aren't useful to mainline kernel and mostly just add an extra layer of obfuscation. Although they have comments, without actual in-kernel users, it is difficult to tell what are their assumptions and they're actually trying to achieve. To mainline kernel, they just aren't worth keeping around. This patch kills the following trivial tracehooks. * Ones testing whether task is ptraced. Replace with ->ptrace test. tracehook_expect_breakpoints() tracehook_consider_ignored_signal() tracehook_consider_fatal_signal() * ptrace_event() wrappers. Call directly. tracehook_report_exec() tracehook_report_exit() tracehook_report_vfork_done() * ptrace_release_task() wrapper. Call directly. tracehook_finish_release_task() * noop tracehook_prepare_release_task() tracehook_report_death() This doesn't introduce any behavior change.
Showing the changes to kernel/fork.c (1 of 7 files). Show all
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| @@ -1527,7 +1527,7 @@ long do_fork(unsigned long clone_flags, · 1526 unmodified lines | ||
| 1527 | 1527 | freezer_do_not_count(); |
| 1528 | 1528 | wait_for_completion(&vfork); |
| 1529 | 1529 | freezer_count(); |
| 1530 | − tracehook_report_vfork_done(p, nr); | |
| 1530 | + ptrace_event(PTRACE_EVENT_VFORK_DONE, nr); | |
| 1531 | 1531 | } |
| 1532 | 1532 | } else { |
| 1533 | 1533 | nr = PTR_ERR(p); |