lkml.org 
[lkml]   [2021]   [Feb]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [RFC][PATCH] kprobes: Remove kprobe::fault_handler
On Wed, Feb 10, 2021 at 5:57 AM Peter Zijlstra <peterz@infradead.org> wrote:
>
>
> Somewhat related.. I had this pending.
>
> ---
> Subject: kprobes: Remove kprobe::fault_handler
> From: Peter Zijlstra <peterz@infradead.org>
> Date: Tue Feb 2 10:43:41 CET 2021
>
> The reason for kprobe::fault_handler(), as given by their comment:
>
> * We come here because instructions in the pre/post
> * handler caused the page_fault, this could happen
> * if handler tries to access user space by
> * copy_from_user(), get_user() etc. Let the
> * user-specified handler try to fix it first.
>
> If just plain bad. Those other handlers are ran from non-preemptible
> context and had better use _nofault() functions. Also, there is no
> upstream usage of this.

No objections from me.

Since Masami mentioned that systemtap used that you
probably want to give them a courtesy heads-up that it's going away.
Though looking at systemtap source code I couldn't find any
reference to it. So it's likely a nop for them anyway.

\
 
 \ /
  Last update: 2021-02-10 20:50    [W:0.519 / U:0.868 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site