linux-kernel - Re: [PATCH] drivers/memory: can't open emif-asm-offsets.s for writing

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Date:   Sat, 7 Apr 2018 11:39:34 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     Tony Lindgren <tony@...mide.com>, d-gerlach@...com,
        santosh shilimkar <santosh.shilimkar@...cle.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/memory: can't open emif-asm-offsets.s for writing

2018-04-06 22:00 GMT+09:00 Anders Roxell <anders.roxell@...aro.org>:
> Build failes due to that the directory isn't created before we execute
> the build rule.
> cc1: fatal error: can’t open ‘drivers/memory/emif-asm-offsets.s’ for
>   writing: No such file or directory compilation terminated.
> drivers/memory/Makefile.asm-offsets:2: recipe for target 'drivers/memory/emif-asm-offsets.s' failed
> make[2]: *** [drivers/memory/emif-asm-offsets.s] Error 1
> Makefile:1060: recipe for target
> 'arch/arm/mach-omap2' failed
> make[1]: *** [arch/arm/mach-omap2] Error 2
> make[1]: *** Waiting for unfinished jobs....
>
> Current code adds a file check before checking the dependency, in
> filechk it does mkdir -p $(dir $@).
>
> Fixes: 41d9d44d7258 ("ARM: OMAP2+: pm33xx-core: Add platform code needed for PM")
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> ---
>  drivers/memory/Makefile.asm-offsets | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/memory/Makefile.asm-offsets b/drivers/memory/Makefile.asm-offsets
> index 843ff60ccb5a..70d44a9ed32a 100644
> --- a/drivers/memory/Makefile.asm-offsets
> +++ b/drivers/memory/Makefile.asm-offsets
> @@ -1,4 +1,5 @@
>  drivers/memory/emif-asm-offsets.s: drivers/memory/emif-asm-offsets.c
> +       $(call filechk,$@)
>         $(call if_changed_dep,cc_s_c)
>
>  include/generated/ti-emif-asm-offsets.h: drivers/memory/emif-asm-offsets.s FORCE
> --
> 2.16.3


Why filechk just for creating a directory?


$(Q)mkdir $(dir $@)

is enough, but still this is a bad fix.


Generating the same object from different directories
is fragile in parallel building.




-- 
Best Regards
Masahiro Yamada