[PATCH v2] kbuild: simplify rustfmt target

[Masahiro Yamada <masahiroy@kernel.org>]

There is no need to prune the rust/alloc directory because it was
removed by commit 9d0441bab775 ("rust: alloc: remove our fork of the
`alloc` crate").

Pruning the rust/test directory is unneeded because no '*.rs' files are
generated within it.

To avoid forking the 'grep' process, filter out generated files using
the option, ! -name '*generated*'.

Now that the '-path ... -prune' option is no longer used, there is no
need to use the absolute path. Searching in $(srctree) is sufficient.

The comment mentions the use case where $(srctree) is '..', that is,
$(objtree) is a sub-directory of $(srctree). In this scenario, all
'*.rs' files under $(objtree) are generated files and filters out by
the '*generated*' pattern.

Add $(RCS_FIND_IGNORE) as a shortcut. Although I do not believe '*.rs'
files would exist under the .git directory, there is no need to traverse
it.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <n.schier@avm.de>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
---

Changes in v2:
  - Merge the previous two patches
  - Remove -prune completely
  - Filter out 'generated' files by the find option
  - Remove the unnecessary comment
  - Add $(RCS_FIND_IGNORE)

 Makefile | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/Makefile b/Makefile
index eaa8511dc4bf..9f251f528504 100644
--- a/Makefile
+++ b/Makefile
@@ -1754,18 +1754,9 @@ rusttest: prepare
 # Formatting targets
 PHONY += rustfmt rustfmtcheck
 
-# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
-#
-# We match using absolute paths since `find` does not resolve them
-# when matching, which is a problem when e.g. `srctree` is `..`.
-# We `grep` afterwards in order to remove the directory entry itself.
 rustfmt:
-	$(Q)find $(abs_srctree) -type f -name '*.rs' \
-		-o -path $(abs_srctree)/rust/alloc -prune \
-		-o -path $(abs_objtree)/rust/test -prune \
-		| grep -Fv $(abs_srctree)/rust/alloc \
-		| grep -Fv $(abs_objtree)/rust/test \
-		| grep -Fv generated \
+	$(Q)find $(srctree) $(RCS_FIND_IGNORE) \
+		-type f -a -name '*.rs' -a ! -name '*generated*' -print \
 		| xargs $(RUSTFMT) $(rustfmt_flags)
 
 rustfmtcheck: rustfmt_flags = --check
-- 
2.43.0