Kbuild: add a new target to check for section mismatches

From: Mauro Carvalho Chehab <mchehab@redhat.com>

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 15 insertions, 1 deletions

diff --git a/INSTALL b/INSTALL
index 5ff4860af..c154677d5 100644
--- a/INSTALL
+++ b/INSTALL
@@ -134,3 +134,9 @@ checkpatch	- checks codingstyle and reports using the same
 
 checkterse	- checks codingstyle and reports using terse
 		  syntax, used on several compilaton tools.
+
+mismatch	- checks for linker section mismatch. In other words,
+		  check if some driver has functions not properly 
+		  declared with __init/__exit, and similar tags.
+		  It will also be more pedantic by dealing with 
+		  compilation warnings as if they are errors.
diff --git a/v4l/Makefile b/v4l/Makefile
index dc0cfcaa6..23ae32cad 100644
--- a/v4l/Makefile
+++ b/v4l/Makefile
@@ -45,6 +45,11 @@ default:: config-compat.h Makefile.media links oss firmware
 	./scripts/rmmod.pl check
 #	$(MAKE) checkpatch
 
+mismatch:: config-compat.h Makefile.media links oss firmware
+	@echo Kernel build directory is $(OUTDIR)
+	$(MAKE) -Wfatal-errors -C $(OUTDIR) SUBDIRS=$(PWD) $(MYCFLAGS) CONFIG_DEBUG_SECTION_MISMATCH=y modules
+	./scripts/rmmod.pl check
+
 firmware::
 	$(MAKE) -C firmware prep
 	$(MAKE) -C firmware
diff --git a/v4l/scripts/do_merge.pl b/v4l/scripts/do_merge.pl
index 0a4433a21..1a6bbb1ee 100755
--- a/v4l/scripts/do_merge.pl
+++ b/v4l/scripts/do_merge.pl
@@ -153,7 +153,10 @@ if ($n_heads == 2) {
 # Test resulting tree
 
 print "Testing if the build didn't break compilation. Only errors and warnings will be displayed. Please wait.\n";
-$ret = system ('make all|egrep -v "^\s*CC"|egrep -v "^\s*LD"');
+$ret = system ('make allmodconfig');
+if (!ret) {
+	$ret = system ('make mismatch|egrep -v "^\s*CC"|egrep -v "^\s*LD"');
+}
 if ($ret) {
 	print "Build failed. Can't procceed.\n";