linux-kernel - Re: [PATCH 2/7] kbuild: Add P= command line flag to run checkpatch

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Date:   Mon, 20 Nov 2017 17:00:48 -0700
From:   Jim Davis <jim.epost@...il.com>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Cc:     Knut Omang <knut.omang@...cle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Marek <mmarek@...e.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH 2/7] kbuild: Add P= command line flag to run checkpatch

On Mon, Nov 20, 2017 at 2:22 PM, Luc Van Oostenryck
<luc.vanoostenryck@...il.com> wrote:

> Should it be possible to somehow keep the distinction between
> the flags coming from KBUILD_CFLAGS and the pure CHECKFLAGS?

Well, the practical problem seems to be that $(CHECK) is called in
scripts/Makefile.build with both $(CHECKFLAGS) and $(c_flags) as
arguments, regardless of what $(CHECK) is.  That can be hacked around
with something inelegant like

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index bb831d49bcfd..102194f9afb9 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -98,14 +98,20 @@ __build: $(if $(KBUILD_BUILTIN),$(builtin-target)
$(lib-target) $(extra-y)) \
         $(subdir-ym) $(always)
        @:

-# Linus' kernel sanity checking tool
+# Linus' kernel sanity checking tool, or $CHECK program of choice
+ifneq ($(KBUILD_CHECKSRC),)
+  add_to_checkflags =
+  ifeq ($(CHECK),sparse)
+    add_to_checkflags = $(c_flags)
+  endif
+endif
 ifneq ($(KBUILD_CHECKSRC),0)
   ifeq ($(KBUILD_CHECKSRC),2)
     quiet_cmd_force_checksrc = CHECK   $<
-          cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
+          cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(add_to_checkflags) $< ;
   else
       quiet_cmd_checksrc     = CHECK   $<
-            cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
+            cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(add_to_checkflags) $< ;
   endif
 endif

and then if I run scripts/checkpatch.pl as $CHECK and pass --quiet
--file as before it works -- until checkpatch returns with a non-zero
exit code, which causes the Makefile to bail at that point.

So maybe a wrapper script, with an exit 0 fixup to keep on keeping on
in case of checkpatch warnings or errors, would be better after all.


-- 
Jim