linux-kernel - [PATCH] drm/i915: disable KASAN for handlers

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Date:   Thu, 30 Mar 2017 11:46:27 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     zhenyuw@...ux.intel.com
Cc:     linux-kernel@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>,
        Martin Liska <mliska@...e.cz>, Zhi Wang <zhi.a.wang@...el.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm/i915: disable KASAN for handlers

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 43760 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
drivers/gpu/drm/i915/gvt/handlers.c:2402:1: error: the frame size of 9400 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
drivers/gpu/drm/i915/gvt/handlers.c:2628:1: error: the frame size of 11256 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]

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.

So disable KASAN for this file.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Martin Liska <mliska@...e.cz>
Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>
Cc: Zhi Wang <zhi.a.wang@...el.com>
Cc: Daniel Vetter <daniel.vetter@...el.com>
Cc: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: David Airlie <airlied@...ux.ie>
Cc: intel-gvt-dev@...ts.freedesktop.org
Cc: intel-gfx@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org
---
 drivers/gpu/drm/i915/gvt/Makefile | 2 ++
 1 file changed, 2 insertions(+)

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 := gvt.o aperture_gm.o handlers.o vgpu.o trace_points.o firmware.o \
 ccflags-y				+= -I$(src) -I$(src)/$(GVT_DIR) -Wall
 i915-y					+= $(addprefix $(GVT_DIR)/, $(GVT_SOURCE))
 obj-$(CONFIG_DRM_I915_GVT_KVMGT)	+= $(GVT_DIR)/kvmgt.o
+
+KASAN_SANITIZE_handlers.o := n
-- 
2.12.2