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Commit e78e8f2d authored by Peter Foley's avatar Peter Foley Committed by Michal Marek
Browse files

kernel: prevent unnecessary rebuilding due to config_data.gz 



When IKCONFIG is built-in make oldconfig will cause the kernel to be
relinked even if .config didn't change. This happens because of a
config_data.gz dependency on .config. This patch changes the if_changed
to a filechk so that config_data.h is only rebuilt when the contents
have actually changed.

Signed-off-by: default avatarPeter Foley <pefoley2@verizon.net>
Signed-off-by: default avatarMichal Marek <mmarek@suse.cz>
parent f210735f

kernel/Makefile

+2 −3
Original line number Original line Diff line number Diff line
@@ -125,11 +125,10 @@ targets += config_data.gz 
$(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE

$(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE

	$(call if_changed,gzip)

	$(call if_changed,gzip)





quiet_cmd_ikconfiggz = IKCFG   $@

      filechk_ikconfiggz = (echo "static const char kernel_config_data[] __used = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;")

      cmd_ikconfiggz = (echo "static const char kernel_config_data[] __used = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;") > $@

targets += config_data.h

targets += config_data.h

$(obj)/config_data.h: $(obj)/config_data.gz FORCE

$(obj)/config_data.h: $(obj)/config_data.gz FORCE

	$(call if_changed,ikconfiggz)

	$(call filechk,ikconfiggz)





$(obj)/time.o: $(obj)/timeconst.h

$(obj)/time.o: $(obj)/timeconst.h