powerpc: improve prom_init_check rule
This slightly improves the prom_init_check rule. [1] Avoid needless check Currently, prom_init_check.sh is invoked every time you run 'make' even if you have changed nothing in prom_init.c. With this commit, the script is re-run only when prom_init.o is recompiled. [2] Beautify the build log Currently, the O= build shows the absolute path to the script: CALL /abs/path/to/source/of/linux/arch/powerpc/kernel/prom_init_check.sh With this commit, it is always a relative path to the timestamp file: PROMCHK arch/powerpc/kernel/prom_init_check Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190912074037.13813-1-yamada.masahiro@socionext.com
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@ -1 +1,2 @@
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prom_init_check
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vmlinux.lds
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@ -188,15 +188,13 @@ extra-$(CONFIG_ALTIVEC) += vector.o
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extra-$(CONFIG_PPC64) += entry_64.o
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extra-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += prom_init.o
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ifdef CONFIG_PPC_OF_BOOT_TRAMPOLINE
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$(obj)/built-in.a: prom_init_check
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extra-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += prom_init_check
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quiet_cmd_prom_init_check = CALL $<
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cmd_prom_init_check = $(CONFIG_SHELL) $< "$(NM)" "$(obj)/prom_init.o"
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quiet_cmd_prom_init_check = PROMCHK $@
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cmd_prom_init_check = $(CONFIG_SHELL) $< "$(NM)" $(obj)/prom_init.o; touch $@
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PHONY += prom_init_check
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prom_init_check: $(src)/prom_init_check.sh $(obj)/prom_init.o
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$(call cmd,prom_init_check)
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endif
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$(obj)/prom_init_check: $(src)/prom_init_check.sh $(obj)/prom_init.o FORCE
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$(call if_changed,prom_init_check)
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targets += prom_init_check
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clean-files := vmlinux.lds
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