linux-kernel - [PATCH] ARM: simplify the build rule of mach-types.h

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Date:   Fri, 28 May 2021 12:49:13 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     patches@....linux.org.uk
Cc:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] ARM: simplify the build rule of mach-types.h

The directory of mach-types.h is created a couple of lines above:

  _dummy := $(shell [ -d '$(kapi)' ] || mkdir -p '$(kapi)') \

The 'mkdir -p' command is redundant.

scripts/Kbuild.include defines real-prereqs as a shorthand for
$(filter-out $(PHONY),$^). Let's use it to simplify the code.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 arch/arm/tools/Makefile | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm/tools/Makefile b/arch/arm/tools/Makefile
index 87de1f63f649..057639019059 100644
--- a/arch/arm/tools/Makefile
+++ b/arch/arm/tools/Makefile
@@ -33,8 +33,7 @@ _dummy := $(shell [ -d '$(kapi)' ] || mkdir -p '$(kapi)') \
           $(shell [ -d '$(uapi)' ] || mkdir -p '$(uapi)')
 
 quiet_cmd_gen_mach = GEN     $@
-      cmd_gen_mach = mkdir -p $(dir $@) && \
-		     $(AWK) -f $(filter-out $(PHONY),$^) > $@
+      cmd_gen_mach = $(AWK) -f $(real-prereqs) > $@
 
 $(kapi)/mach-types.h: $(src)/gen-mach-types $(src)/mach-types FORCE
 	$(call if_changed,gen_mach)
-- 
2.27.0