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Date:   Thu, 9 Nov 2017 15:04:16 +0100
From:   Oleg Nesterov <>
To:     Yonghong Song <>
Subject: Re: [PATCH] uprobes/x86: emulate push insns for uprobe on x86

On 11/09, Oleg Nesterov wrote:
> And. Do you really need ->post_xol() method to emulate "push"? Why we can't
> simply execute it out-of-line if copy_to_user() fails?
> branch_post_xol_op() is needed because we can't execute "call" out-of-line,
> we need to restart and try again if copy_to_user() fails, but I don not
> understand why it is needed to emulate "push".

If I wasn't clear, please see the comment in branch_clear_offset().


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