From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: [PATCH v2] leds: ledtrig-morse: send out morse code Date: Wed, 4 Jul 2018 20:19:16 +0200 Message-ID: <20180704181916.GA10785@amd> References: <20180703155328.GA18299@arbeit> <20180704065305.GA23509@amd> <20180704073443.GA9388@1wt.eu> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="fUYQa+Pmc3FrFX/N" Return-path: Content-Disposition: inline In-Reply-To: <20180704073443.GA9388@1wt.eu> Sender: linux-kernel-owner@vger.kernel.org To: Willy Tarreau Cc: Andreas Klinger , jacek.anaszewski@gmail.com, ben.whitten@gmail.com, geert+renesas@glider.be, pombredanne@nexb.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org List-Id: linux-leds@vger.kernel.org --fUYQa+Pmc3FrFX/N Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi! > On Wed, Jul 04, 2018 at 08:53:05AM +0200, Pavel Machek wrote: > > As I stated before, I don't think morse encoder belongs in kernel. >=20 > On the opposite, I think that the kernel needs to be a bit more autonomous > when it comes to reporting its own issues. Being able to report a panic > when userland cannot be accessed for example is the reason why we've seen > various features such as blinking keyboard LEDs for this. Being able to report panics by blinking would be nice... but proposed patch does NOT do that. > > LED pattern trigger should be merged, instead. >=20 > Well, just like we have LED and LED triggers in the kernel, I think having > a generic way to use patterns could be nice and in this case Morse could = be > one such pattern, but if that means it's limited to userland to configure > it then it sadly voids all of its benefits. Proposed patch is already limited to configuration from userland... so it does not have any benefits. If special "panic blinking" mode is wanted -- I guess that would make sense. But a) trigger may not be right infrastructure for that; triggers need quite a lot kernel to be working, as they run in separate threads -- panic blinking probably should be mdelay / brightness set / mdelay, and probably limited to LEDs that can be accessed without sleeping. b) we may want trigger to be used for something else (Caps lock? HDD activity?) when not panicked. Thus, again, trigger is not exactly suitable. (It might make sense to blink many/all LEDs simultaneously to make it super obvious to the user). Pavel --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --fUYQa+Pmc3FrFX/N Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAls9D6QACgkQMOfwapXb+vJBBQCgnDtU7XYmFul7TKOT2pU99SNY 01gAoJn7YYvvoYh0eCxrS+AEOFQOjHR4 =rhKO -----END PGP SIGNATURE----- --fUYQa+Pmc3FrFX/N--