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SubjectRe: [PATCH] drm/i915: disable KASAN for handlers
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 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@suse.cz>
> Cc: Martin Liska <mliska@suse.cz>
> Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
> Cc: Zhi Wang <zhi.a.wang@intel.com>
> Cc: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: David Airlie <airlied@linux.ie>
> 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(+)
>
> 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
>

Applied this, we'd better cleanup legacy usage to current i915 mmio reg define. Thanks!

--
Open Source Technology Center, Intel ltd.

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