dt-bindings: Fix command line length limit calling dt-mk-schema
authorRob Herring <robh@kernel.org>
Tue, 21 Apr 2020 20:42:02 +0000 (15:42 -0500)
committerRob Herring <robh@kernel.org>
Fri, 24 Apr 2020 14:28:58 +0000 (09:28 -0500)
commit8b6b80218b0170b28a1483ee7db141495b9f8ad2
treed90b61abc9b7b30c5c44d7cf029688fed5d1ade3
parente996c1fd0c3e97a90732940e4c0045b5b6c5047a
dt-bindings: Fix command line length limit calling dt-mk-schema

As the number of schemas has increased, we're starting to hit the error
"execvp: /bin/sh: Argument list too long". This is due to passing all the
schema files on the command line to dt-mk-schema. It currently is only
with out of tree builds and is intermittent depending on the file path
lengths.

Commit 2ba06cd8565b ("kbuild: Always validate DT binding examples") made
hitting this proplem more likely since the example validation now always
gets the full list of schemas.

Fix this by passing the schema file list in a pipe and using xargs. We end
up doing the find twice, but the time is insignificant compared to the
dt-mk-schema time.

Reported-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Documentation/devicetree/bindings/Makefile