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kprobes: Remove kretprobe hash

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The kretprobe hash is mostly superfluous, replace it with a per-task
variable.

This gets rid of the task hash and it's related locking.

Note that this may change the kprobes module-exported API for kretprobe
handlers. If any out-of-tree kretprobe user uses ri->rp, use
get_kretprobe(ri) instead.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/159870620431.1229682.16325792502413731312.stgit@devnote2
This commit is contained in:
Peter Zijlstra
2020-08-29 22:03:24 +09:00
committed by Ingo Molnar
parent 476c5818c3
commit d741bf41d7
5 changed files with 99 additions and 171 deletions
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4
kernel/fork.c
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@@ -2161,6 +2161,10 @@ static __latent_entropy struct task_struct *copy_process(
INIT_LIST_HEAD(&p->thread_group);
p->task_works = NULL;
#ifdef CONFIG_KRETPROBES
p->kretprobe_instances.first = NULL;
#endif
/*
* Ensure that the cgroup subsystem policies allow the new process to be
* forked. It should be noted the the new process's css_set can be changed