On Thu, Feb 20, 2020 at 07:58:58AM +0000, Chris Wilson wrote:
> Quoting Alex Deucher (2020-02-20 02:52:32)
> > On Wed, Feb 19, 2020 at 7:42 PM Paul E. McKenney <paulmck@xxxxxxxxxx> wrote:
> > >
> > > Hello!
> > >
> > > A box with GCC 4.8.3 compiler didn't like drm_dp_mst_topology.c. The
> > > following (lightly tested) patch makes it happy and seems OK for newer
> > > compilers as well.
> > >
> > > Is this of interest?
> >
> > How about a memset instead? That should be consistent across compilers.
>
> The kernel has adopted the gccism: struct drm_dp_desc desc = {};
> git grep '= {}' | wc -l: 2046
> git grep '= { }' | wc -l: 694
> -Chris
And this works well, a big "thank you!" to all three of you!
Please see below for the updated patch.
Thanx, Paul
------------------------------------------------------------------------
commit 78c0e53a98a9772a99e46806f8fcbe1140d667a4
Author: Paul E. McKenney <paulmck@xxxxxxxxxx>
Date: Wed Feb 19 16:42:47 2020 -0800
EXP drm: Make drm_dp_mst_dsc_aux_for_port() safe for old compilers
Older compilers either want two extra pairs of curly braces around the
initializer for local variable desc, or they want a single pair of curly
braces with nothing inside. Current Linux-kernel practice favors the
latter, so this commit makes it so.
Suggested-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Suggested-by: Joe Perches <joe@xxxxxxxxxxx>
Suggested-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 20cdaf3..b123f60 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -5396,7 +5396,7 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port)
{
struct drm_dp_mst_port *immediate_upstream_port;
struct drm_dp_mst_port *fec_port;
- struct drm_dp_desc desc = { 0 };
+ struct drm_dp_desc desc = { };
u8 endpoint_fec;
u8 endpoint_dsc;
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