kbuild: Do not overwrite include/config/kernel.release needlessly
Use filechk to detect if the content changed or not.
Signed-off-by: Michal Marek <mmarek@suse.cz>
diff --git a/Makefile b/Makefile
index 9262ba8..cf89776 100644
--- a/Makefile
+++ b/Makefile
@@ -794,10 +794,13 @@
$(vmlinux-dirs): prepare scripts
$(Q)$(MAKE) $(build)=$@
+define filechk_kernel.release
+ echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
+endef
+
# Store (new) KERNELRELEASE string in include/config/kernel.release
include/config/kernel.release: include/config/auto.conf FORCE
- $(Q)rm -f $@
- $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
+ $(call filechk,kernel.release)
# Things we need to do before we recursively start building the kernel