linux-kernel - Re: [PATCH mm-stable] uprobes: Revert ref_ctr_offset in uprobe

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Message-ID: <aCNpbPuY6FI1Aiyx@redhat.com>
Date: Tue, 13 May 2025 17:46:52 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Jiri Olsa <jolsa@...nel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrii Nakryiko <andrii@...nel.org>, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH mm-stable] uprobes: Revert ref_ctr_offset in
 uprobe_unregister error path

On 05/13, Jiri Olsa wrote:
>
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -581,8 +581,8 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe, struct vm_area_struct *vma,
>  
>  out:
>  	/* Revert back reference counter if instruction update failed. */
> -	if (ret < 0 && is_register && ref_ctr_updated)
> -		update_ref_ctr(uprobe, mm, -1);
> +	if (ret < 0 && ref_ctr_updated)
> +		update_ref_ctr(uprobe, mm, is_register ? -1 : 1);

Acked-by: Oleg Nesterov <oleg@...hat.com>

And just in case, I agree this has nothing to do with the recent changes from David.

Oleg.