linux-kernel - Re: [PATCH perf/core 01/11] uprobes: Add unique flag to uprobe consumer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <aLguPcQFauCX5Wfp@krava>
Date: Wed, 3 Sep 2025 14:02:05 +0200
From: Jiri Olsa <olsajiri@...il.com>
To: Oleg Nesterov <oleg@...hat.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrii Nakryiko <andrii@...nel.org>, bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	x86@...nel.org, Song Liu <songliubraving@...com>,
	Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	Hao Luo <haoluo@...gle.com>, Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH perf/core 01/11] uprobes: Add unique flag to uprobe
 consumer

On Wed, Sep 03, 2025 at 12:49:33PM +0200, Oleg Nesterov wrote:
> On 09/02, Jiri Olsa wrote:
> >
> > +static bool consumer_can_add(struct list_head *head, struct uprobe_consumer *uc)
> > +{
> > +	/* Uprobe has no consumer, we can add any. */
> > +	if (list_empty(head))
> > +		return true;
> > +	/* Uprobe has consumer/s, we can't add unique one. */
> > +	if (uc->is_unique)
> > +		return false;
> > +	/*
> > +	 * Uprobe has consumer/s, we can add nother consumer only if the
> > +	 * current consumer is not unique.
> > +	 **/
> > +	return !list_first_entry(head, struct uprobe_consumer, cons_node)->is_unique;
> > +}
> 
> Since you are going to send V2 anyway... purely cosmetic and subjective nit,
> but somehow I can't resist,
> 
> 	bool consumer_can_add(struct list_head *head, struct uprobe_consumer *new)
> 	{
> 		struct uprobe_consumer *old = list_first_entry_or_null(...);
> 
> 		return !old || (!old->exclusive && !new->exclusive);
> 	}
> 
> looks a bit more readable to me. Please ignore if you like your version more.

yep, looks better, thanks

jirka