linux-kernel - Re: [PATCH] clockevents: Introduce mode specific callbacks

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: <CAKohpo=0cG1Bo8NgcrMVTLo=bDnUoD-R8fY5XKT=22X8bzRv2A@mail.gmail.com>
Date:	Thu, 12 Feb 2015 09:09:30 +0800
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linaro Kernel Mailman List <linaro-kernel@...ts.linaro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kevin Hilman <khilman@...aro.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Linaro Networking <linaro-networking@...aro.org>
Subject: Re: [PATCH] clockevents: Introduce mode specific callbacks

On 11 February 2015 at 18:38, Peter Zijlstra <peterz@...radead.org> wrote:
> I think its better to be strict; esp. with new interfaces. It avoids
> confusion.
>
> Suppose a driver writer sees these new methods and thinks to use one
> while still having the set_mode() one -- ie. he didn't actually read the
> comment. We'd better make sure he fails and goes back to read it.

Okay, does below diff looks good to you ?

diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index e646fbe44b05..75d221c7e9cc 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -444,8 +444,12 @@ EXPORT_SYMBOL_GPL(clockevents_unbind);
 static int clockevents_sanity_check(struct clock_event_device *dev)
 {
        /* Legacy set_mode() callback */
-       if (dev->set_mode)
+       if (dev->set_mode) {
+               /* We shouldn't be supporting new modes now */
+               WARN_ON(dev->set_mode_periodic || dev->set_mode_oneshot ||
+                       dev->set_mode_shutdown || dev->set_mode_resume);
                return 0;
+       }

        if (dev->features & CLOCK_EVT_FEAT_DUMMY)
                return 0;
--
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/