linux-kernel - Re: [PATCH 2/3] ftrace: use struct pid

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: <alpine.DEB.1.10.0812041044250.19693@gandalf.stny.rr.com>
Date:	Thu, 4 Dec 2008 10:44:44 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Steven Rostedt <srostedt@...hat.com>,
	containers@...ts.osdl.org, Ingo Molnar <mingo@...e.hu>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dipankar Sarma <dipankar@...ibm.com>
Subject: Re: [PATCH 2/3] ftrace: use struct pid


On Thu, 4 Dec 2008, Dave Hansen wrote:
> > 
> > We probably should.  Historically read_lock(&tasklist_lock) implies
> > rcu_read_lock().  And the tasklist lock is what we hold when it is
> > safe.
> 
> So, Dipankar tells me that you really do need rcu_read_lock/unlock() for
> the guarantee here; the tasklist lock is not sufficient.  The realtime
> kernel will preempt even those sections covered by spinlocks.

Yes it will.

-- Steve

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/