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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
This commit is contained in:
Masahiro Yamada 2019-09-12 16:40:37 +09:00 committed by Michael Ellerman
parent caff52dc0b
commit 1fdfa4c6af
2 changed files with 7 additions and 8 deletions
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1
arch/powerpc/kernel/.gitignore vendored
View File

@ -1 +1,2 @@
prom_init_check
vmlinux.lds

14
arch/powerpc/kernel/Makefile
View File

@ -188,15 +188,13 @@ extra-$(CONFIG_ALTIVEC) += vector.o
extra-$(CONFIG_PPC64) += entry_64.o
extra-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += prom_init.o
ifdef CONFIG_PPC_OF_BOOT_TRAMPOLINE
$(obj)/built-in.a: prom_init_check
extra-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += prom_init_check
quiet_cmd_prom_init_check = CALL $<
cmd_prom_init_check = $(CONFIG_SHELL) $< "$(NM)" "$(obj)/prom_init.o"
quiet_cmd_prom_init_check = PROMCHK $@
cmd_prom_init_check = $(CONFIG_SHELL) $< "$(NM)" $(obj)/prom_init.o; touch $@
PHONY += prom_init_check
prom_init_check: $(src)/prom_init_check.sh $(obj)/prom_init.o
$(call cmd,prom_init_check)
endif
$(obj)/prom_init_check: $(src)/prom_init_check.sh $(obj)/prom_init.o FORCE
$(call if_changed,prom_init_check)
targets += prom_init_check
clean-files := vmlinux.lds