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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
2020-10-12 18:27:27 +02:00
committed by Ingo Molnar
parent 476c5818c3
commit d741bf41d7
5 changed files with 99 additions and 171 deletions
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kernel/trace/trace_kprobe.c
+2 -1
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@@ -1714,7 +1714,8 @@ NOKPROBE_SYMBOL(kprobe_dispatcher);
static int
kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs)
{
struct trace_kprobe *tk = container_of(ri->rp, struct trace_kprobe, rp);
struct kretprobe *rp = get_kretprobe(ri);
struct trace_kprobe *tk = container_of(rp, struct trace_kprobe, rp);
raw_cpu_inc(*tk->nhit);