From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zhenyu Wang Subject: Re: [PATCH] drm/i915: disable KASAN for handlers Date: Fri, 31 Mar 2017 15:21:48 +0800 Message-ID: <20170331072148.lbb7x6tj5egkpppm@zhen-hp.sh.intel.com> References: <20170330094627.29460-1-jslaby@suse.cz> Reply-To: Zhenyu Wang Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0088871543==" Return-path: In-Reply-To: <20170330094627.29460-1-jslaby@suse.cz> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Jiri Slaby Cc: intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Daniel Vetter , Martin Liska , Zhi Wang List-Id: dri-devel@lists.freedesktop.org --===============0088871543== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="xx2k5uuyp3gmvnzw" Content-Disposition: inline --xx2k5uuyp3gmvnzw Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2017.03.30 11:46:27 +0200, Jiri Slaby wrote: > Handlers are currently the only blocker to compile the kernel with gcc 7 > and KASAN+use-after-scope enabled: > drivers/gpu/drm/i915/gvt/handlers.c:2200:1: error: the frame size of 4376= 0 bytes is larger than 2048 bytes [-Werror=3Dframe-larger-than=3D] > drivers/gpu/drm/i915/gvt/handlers.c:2402:1: error: the frame size of 9400= bytes is larger than 2048 bytes [-Werror=3Dframe-larger-than=3D] > drivers/gpu/drm/i915/gvt/handlers.c:2628:1: error: the frame size of 1125= 6 bytes is larger than 2048 bytes [-Werror=3Dframe-larger-than=3D] >=20 > It is due to many expansions of MMIO_* macros in init_generic_mmio_info. > INTEL_GVT_MMIO_OFFSET generates for each such line a __reg and an > offset. There are too many for KASAN to keep up. >=20 > So disable KASAN for this file. >=20 > Signed-off-by: Jiri Slaby > Cc: Martin Liska > Cc: Zhenyu Wang > Cc: Zhi Wang > Cc: Daniel Vetter > Cc: Jani Nikula > Cc: David Airlie > Cc: intel-gvt-dev@lists.freedesktop.org > Cc: intel-gfx@lists.freedesktop.org > Cc: dri-devel@lists.freedesktop.org > --- > drivers/gpu/drm/i915/gvt/Makefile | 2 ++ > 1 file changed, 2 insertions(+) >=20 > diff --git a/drivers/gpu/drm/i915/gvt/Makefile b/drivers/gpu/drm/i915/gvt= /Makefile > index b123c20e2097..942f1849d194 100644 > --- a/drivers/gpu/drm/i915/gvt/Makefile > +++ b/drivers/gpu/drm/i915/gvt/Makefile > @@ -6,3 +6,5 @@ GVT_SOURCE :=3D gvt.o aperture_gm.o handlers.o vgpu.o tra= ce_points.o firmware.o \ > ccflags-y +=3D -I$(src) -I$(src)/$(GVT_DIR) -Wall > i915-y +=3D $(addprefix $(GVT_DIR)/, $(GVT_SOURCE)) > obj-$(CONFIG_DRM_I915_GVT_KVMGT) +=3D $(GVT_DIR)/kvmgt.o > + > +KASAN_SANITIZE_handlers.o :=3D n > --=20 > 2.12.2 >=20 Applied this, we'd better cleanup legacy usage to current i915 mmio reg def= ine. Thanks! --=20 Open Source Technology Center, Intel ltd. $gpg --keyserver wwwkeys.pgp.net --recv-keys 4D781827 --xx2k5uuyp3gmvnzw Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iEYEARECAAYFAljeA4wACgkQsQQaM014GCcF3gCfeIUsCq59ggkogiHSh2uG3G4W TXYAnRsJd6zx7c0ylO/o7nWhFlgpFTpI =CGXo -----END PGP SIGNATURE----- --xx2k5uuyp3gmvnzw-- --===============0088871543== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KZHJpLWRldmVs IG1haWxpbmcgbGlzdApkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHBzOi8vbGlz dHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vZHJpLWRldmVsCg== --===============0088871543==--