From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B273EC5CFE7 for ; Wed, 11 Jul 2018 14:46:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E8D420C0D for ; Wed, 11 Jul 2018 14:46:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6E8D420C0D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388723AbeGKOvB (ORCPT ); Wed, 11 Jul 2018 10:51:01 -0400 Received: from mx2.suse.de ([195.135.220.15]:56250 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726689AbeGKOvB (ORCPT ); Wed, 11 Jul 2018 10:51:01 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 886C1AF40; Wed, 11 Jul 2018 14:46:17 +0000 (UTC) Subject: Re: [PATCH v5 2/3] fbcon: Call WARN_CONSOLE_UNLOCKED() where applicable To: Hans de Goede , Bartlomiej Zolnierkiewicz , Petr Mladek , Sergey Senozhatsky Cc: linux-fbdev@vger.kernel.org, Steven Rostedt , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20180628090351.15581-1-hdegoede@redhat.com> <20180628090351.15581-3-hdegoede@redhat.com> From: Thomas Zimmermann Openpgp: preference=signencrypt Autocrypt: addr=tzimmermann@suse.de; keydata= xsBNBFs50uABCADEHPidWt974CaxBVbrIBwqcq/WURinJ3+2WlIrKWspiP83vfZKaXhFYsdg XH47fDVbPPj+d6tQrw5lPQCyqjwrCPYnq3WlIBnGPJ4/jreTL6V+qfKRDlGLWFjZcsrPJGE0 BeB5BbqP5erN1qylK9i3gPoQjXGhpBpQYwRrEyQyjuvk+Ev0K1Jc5tVDeJAuau3TGNgah4Yc hdHm3bkPjz9EErV85RwvImQ1dptvx6s7xzwXTgGAsaYZsL8WCwDaTuqFa1d1jjlaxg6+tZsB 9GluwvIhSezPgnEmimZDkGnZRRSFiGP8yjqTjjWuf0bSj5rUnTGiyLyRZRNGcXmu6hjlABEB AAHNKFRob21hcyBaaW1tZXJtYW5uIDx0emltbWVybWFubkBzdXNlLmNvbT7CwJQEEwEIAD4W IQRyF/usjOnPY0ShaOVoDcEdUwt6IwUCWznTtgIbAwUJA8JnAAULCQgHAgYVCgkICwIEFgID AQIeAQIXgAAKCRBoDcEdUwt6I7D7CACBK42XW+7mCiK8ioXMEy1NzGbXC51RzGea8N83oEJS 1KVUtQxrkDxgrW/WLSl/TfqHFsJpdEFOv1XubWbleun3uKPy0e5vZCd5UjZPkeNjnqfCYTDy hVVsdOuFbtWDppJyJrThLqr9AgSFmoCNNUt1SVpYEEOLNE6C32BhlnSq21VLC+YXTgO/ZHTa YXkq54hHj63jwrcjkBSCkXLh37kHeqnl++GHpN+3R+o3w2OpwHAlvVjdKPT27v1tVkiydsFG 65Vd0n3m/ft+IOrGgxQM1C20uqKvsZGB4r3OGR50ekAybO7sjEJJ1Obl4ge/6RRqcvKz4LMb tGs85D6tPIeFzsBNBFs50uABCADGJj+DP1fk+UWOWrf4O61HTbC4Vr9QD2K4fUUHnzg2B6zU R1BPXqLGG0+lzK8kfYU/F5RjmEcClsIkAaFkg4kzKP14tvY1J5+AV3yNqcdg018HNtiyrSwI E0Yz/qm1Ot2NMZ0DdvVBg22IMsiudQ1tx9CH9mtyTbIXgACvl3PW2o9CxiHPE/bohFhwZwh/ kXYYAE51lhinQ3oFEeQZA3w4OTvxSEspiQR8dg8qJJb+YOAc5IKk6sJmmM7JfFMWSr22satM 23oQ3WvJb4RV6HTRTAIEyyZS7g2DhiytgMG60t0qdABG5KXSQW+OKlZRpuWwKWaLh3if/p/u 69dvpanbABEBAAHCwHwEGAEIACYWIQRyF/usjOnPY0ShaOVoDcEdUwt6IwUCWznS4AIbDAUJ A8JnAAAKCRBoDcEdUwt6I6X3CACJ8D+TpXBCqJE5xwog08+Dp8uBpx0T9n1wE0GQisZruACW NofYn8PTX9k4wmegDLwt7YQDdKxQ4+eTfZeLNQqWg6OCftH5Kx7sjWnJ09tOgniVdROzWJ7c VJ/i0okazncsJ+nq48UYvRGE1Swh3A4QRIyphWX4OADOBmTFl9ZYNPnh23eaC9WrNvFr7yP7 iGjMlfEW8l6Lda//EC5VpXVNza0xeae0zFNst2R9pn+bLkihwDLWxOIyifGRxTqNxoS4I1aw VhxPSVztPMSpIA/sOr/N/p6JrBLn+gui2K6mP7bGb8hF+szfArYqz3T1rv1VzUWAJf5Wre5U iNx9uqqx Message-ID: <717e6337-e7a6-7a92-1c1b-8929a25696b5@suse.de> Date: Wed, 11 Jul 2018 16:46:11 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <20180628090351.15581-3-hdegoede@redhat.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="QBiUdYI2cLAGlVt5Ah5DucB7J6nfmFTpz" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --QBiUdYI2cLAGlVt5Ah5DucB7J6nfmFTpz Content-Type: multipart/mixed; boundary="sNmtio5EuBf8Tpax2m8x7cLI3SzjIhJHB"; protected-headers="v1" From: Thomas Zimmermann To: Hans de Goede , Bartlomiej Zolnierkiewicz , Petr Mladek , Sergey Senozhatsky Cc: linux-fbdev@vger.kernel.org, Steven Rostedt , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Message-ID: <717e6337-e7a6-7a92-1c1b-8929a25696b5@suse.de> Subject: Re: [PATCH v5 2/3] fbcon: Call WARN_CONSOLE_UNLOCKED() where applicable References: <20180628090351.15581-1-hdegoede@redhat.com> <20180628090351.15581-3-hdegoede@redhat.com> In-Reply-To: <20180628090351.15581-3-hdegoede@redhat.com> --sNmtio5EuBf8Tpax2m8x7cLI3SzjIhJHB Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US Hi Am 28.06.2018 um 11:03 schrieb Hans de Goede: > Replace comments about places where the console lock should be held wit= h > calls to WARN_CONSOLE_UNLOCKED() to assert that it is actually held. Debugging fbcon sometimes requires to not take the console lock. This patch breaks the debugging workaround provided by 'fb.lockless_register_fb'. The dmesg is now filled with warnings about the missing lock. Best regards Thomas > Acked-by: Steven Rostedt (VMware) > Reviewed-by: Daniel Vetter > Reviewed-by: Sergey Senozhatsky > Signed-off-by: Hans de Goede > --- > Changes in v3: > -New patch in v3 of this patchset > > Changes in v4: > -Keep the comments about which fbcon functions need locks in place > --- > drivers/video/fbdev/core/fbcon.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/cor= e/fbcon.c > index c910e74d46ff..cd8d52a967aa 100644 > --- a/drivers/video/fbdev/core/fbcon.c > +++ b/drivers/video/fbdev/core/fbcon.c > @@ -828,6 +828,8 @@ static int set_con2fb_map(int unit, int newidx, int= user) > struct fb_info *oldinfo =3D NULL; > int found, err =3D 0; > =20 > + WARN_CONSOLE_UNLOCKED(); > + > if (oldidx =3D=3D newidx) > return 0; > =20 > @@ -3044,6 +3046,8 @@ static int fbcon_fb_unbind(int idx) > { > int i, new_idx =3D -1, ret =3D 0; > =20 > + WARN_CONSOLE_UNLOCKED(); > + > if (!fbcon_has_console_bind) > return 0; > =20 > @@ -3094,6 +3098,8 @@ static int fbcon_fb_unregistered(struct fb_info *= info) > { > int i, idx; > =20 > + WARN_CONSOLE_UNLOCKED(); > + > idx =3D info->node; > for (i =3D first_fb_vc; i <=3D last_fb_vc; i++) { > if (con2fb_map[i] =3D=3D idx) > @@ -3131,6 +3137,9 @@ static int fbcon_fb_unregistered(struct fb_info *= info) > static void fbcon_remap_all(int idx) > { > int i; > + > + WARN_CONSOLE_UNLOCKED(); > + > for (i =3D first_fb_vc; i <=3D last_fb_vc; i++) > set_con2fb_map(i, idx, 0); > =20 > @@ -3177,6 +3186,8 @@ static int fbcon_fb_registered(struct fb_info *in= fo) > { > int ret =3D 0, i, idx; > =20 > + WARN_CONSOLE_UNLOCKED(); > + > idx =3D info->node; > fbcon_select_primary(info); > =20 --=20 Thomas Zimmermann Graphics Driver Developer SUSE Linux GmbH, Maxfeldstr. 5, D-90409 N=C3=BCrnberg Tel: +49-911-74053-0; Fax: +49-911-7417755; https://www.suse.com/ SUSE Linux GmbH, GF: Felix Imend=C3=B6rffer, Jane Smithard, Graham Norton, HRB 21284 (AG N=C3=BCrnberg) --sNmtio5EuBf8Tpax2m8x7cLI3SzjIhJHB-- --QBiUdYI2cLAGlVt5Ah5DucB7J6nfmFTpz Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEchf7rIzpz2NEoWjlaA3BHVMLeiMFAltGGDcACgkQaA3BHVML eiPA0wf/UjMoShlEcO26+mipgSTdopT9blwyQ1cR05HKOc7R5ex02SGodVTYBPSm YAaNa+vnGy0i8UFUirr1kjlYAfipVoU5MmLiT2GZp2tUOQ7RIv79QYgArB4nCGHZ JhOh7enLjJnQHUx0mP0uHe3S3KD5hkUC5zU5aDpreJcFPJABDObVWAhJlsNk1Xvj bzO+XqkN7T4mMCEx1Xlrv1ZVUF6KowfhtvTYYC7Z1+CDcL94fNj92u4IvtFNtyHC oo/I2jr0+QzZC8bfPYWfMSv/2RkQ11bWns8jCnLr3pAKuCn5jxoOgeJLZpruL0H3 KJPQ4pbnSiP79Yrs8WxZwfI5kPK3Fw== =PX+n -----END PGP SIGNATURE----- --QBiUdYI2cLAGlVt5Ah5DucB7J6nfmFTpz--