kbuild: rename built-in.o to built-in.a

Incremental linking is gone, so rename built-in.o to built-in.a, which
is the usual extension for archive files.

This patch does two things, first is a simple search/replace:

git grep -l 'built-in\.o' | xargs sed -i 's/built-in\.o/built-in\.a/g'

The second is to invert nesting of nested text manipulations to avoid
filtering built-in.a out from libs-y2:

-libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.a, $(libs-y)))
+libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/s390/Makefile b/drivers/s390/Makefile
index 2fdab400c1fe..a863b0462b43 100644
--- a/drivers/s390/Makefile
+++ b/drivers/s390/Makefile
@@ -5,5 +5,5 @@
 
 obj-y += cio/ block/ char/ crypto/ net/ scsi/ virtio/
 
-drivers-y += drivers/s390/built-in.o
+drivers-y += drivers/s390/built-in.a