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Date: Mon, 9 Nov 2020 16:13:44 +0000 From: Lee Jones <lee.jones@...aro.org> To: Ville Syrjälä <ville.syrjala@...ux.intel.com> Cc: David Airlie <airlied@...ux.ie>, David Francis <David.Francis@....com>, linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org Subject: Re: [PATCH 14/19] gpu: drm: selftests: test-drm_dp_mst_helper: Place 'struct drm_dp_sideband_msg_req_body' onto the heap On Mon, 09 Nov 2020, Lee Jones wrote: > On Mon, 09 Nov 2020, Ville Syrjälä wrote: > > > On Thu, Nov 05, 2020 at 02:45:12PM +0000, Lee Jones wrote: > > > The stack is too full. > > > > > > Fixes the following W=1 kernel build warning(s): > > > > > > drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c: In function ‘sideband_msg_req_encode_decode’: > > > drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c:161:1: warning: the frame size of 1176 bytes is larger than 1024 bytes [-Wframe-larger-than=] > > > > > > Cc: David Airlie <airlied@...ux.ie> > > > Cc: Daniel Vetter <daniel@...ll.ch> > > > Cc: Lyude Paul <lyude@...hat.com> > > > Cc: David Francis <David.Francis@....com> > > > Cc: dri-devel@...ts.freedesktop.org > > > Signed-off-by: Lee Jones <lee.jones@...aro.org> > > > --- > > > .../drm/selftests/test-drm_dp_mst_helper.c | 29 ++++++++++++------- > > > 1 file changed, 18 insertions(+), 11 deletions(-) > > > > > > diff --git a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c > > > index 1d696ec001cff..0a539456f6864 100644 > > > --- a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c > > > +++ b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c > > > @@ -120,44 +120,51 @@ sideband_msg_req_equal(const struct drm_dp_sideband_msg_req_body *in, > > > static bool > > > sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in) > > > { > > > - struct drm_dp_sideband_msg_req_body out = {0}; > > > + struct drm_dp_sideband_msg_req_body *out; > > > > How big is it? And why is it that big? > > It's a struct of a union of structs. > > And it's all allocated on the stack. Bad news! FYI, I have a v2 of this patch. Just waiting to send it. -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog
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