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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
include/linux/sched.h
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@@ -1315,6 +1315,10 @@ struct task_struct {
struct callback_head mce_kill_me;
#endif
#ifdef CONFIG_KRETPROBES
struct llist_head kretprobe_instances;
#endif
/*
* New fields for task_struct should be added above here, so that
* they are included in the randomized portion of task_struct.