Perform module install actions only if the object area module is newer than install area module, and only announce the updated modules. To do this, the <moddir>/kernel directory must be preserved across invocations of make, so it must be checked for stale modules, which can occur after changing config options. Hence, remove modules from this directory that are not present in modules.order. These changes save 10's of seconds for a single CPU build, save a few seconds for a parallel build, and reduce output clutter for an incremental build. Example: % touch drivers/virtio/virtio_ring.c % make modules modules_install DESCEND objtool CALL scripts/atomic/check-atomics.sh CALL scripts/checksyscalls.sh CC [M] drivers/virtio/virtio_ring.o Building modules, stage 2. MODPOST 2592 modules LD [M] drivers/virtio/virtio_ring.ko INSTALL drivers/virtio/virtio_ring.ko DEPMOD 5.1.0-rc3 Patch 1 fixes a legacy race bug in parallel make. Patch 2 installs only modified modules. Patch 3 removes stale modules. Steve Sistare (3): kbuild: serialize modules and modules_install kbuild: optimize modules_install target kbuild: remove stale modules from install area Makefile | 26 +++++++++++++++++++++----- scripts/Makefile.modinst | 30 +++++++++++++++++++++++------- 2 files changed, 44 insertions(+), 12 deletions(-) -- 1.8.3.1
