linux-kernel - Re: [PATCH 2/3] ARM: at91: move platform-specific asm-offset.h to arch/arm/mach-at91

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Date:   Mon, 15 Apr 2019 17:14:50 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     arm@...nel.org, Olof Johansson <olof@...om.net>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH 2/3] ARM: at91: move platform-specific asm-offset.h to
 arch/arm/mach-at91

On 08/04/2019 16:54:26+0900, Masahiro Yamada wrote:
> <generated/at91_pm_data-offsets.h> is only generated and included
> by arch/arm/mach-at91/, so it does not need to reside in the
> globally visible include/generated/.
> 
> I moved and renamed it to arch/arm/mach-at91/pm_data-offsets.h
> since the prefix 'at91_' is just redundant in mach-at91/.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
Acked-by: Alexandre Belloni <alexandre.belloni@...tlin.com>

> ---
> 
> Can this be applied to ARM-SOC tree in a series?
> (with Ack from the platform sub-maintainer.)
> 
> at91_pm_data-offsets.h header does not need to reside in
> include/generated/, but you may ask
> "Why must it get out of include/generated/?"
> 
> My main motivation is to avoid a race condition in the currently
> proposed patch:
> 
> https://lore.kernel.org/patchwork/patch/1052763/
> 
> This patch tries to embed some build artifacts into the kernel.
> 
> If arch/arm/mach-at91/ and kernel/ are built at the same time,
> it may embed a truncated file.
> 
> 
>  arch/arm/mach-at91/.gitignore   | 1 +
>  arch/arm/mach-at91/Makefile     | 5 +++--
>  arch/arm/mach-at91/pm_suspend.S | 2 +-
>  3 files changed, 5 insertions(+), 3 deletions(-)
>  create mode 100644 arch/arm/mach-at91/.gitignore
> 
> diff --git a/arch/arm/mach-at91/.gitignore b/arch/arm/mach-at91/.gitignore
> new file mode 100644
> index 000000000000..2ecd6f51c8a9
> --- /dev/null
> +++ b/arch/arm/mach-at91/.gitignore
> @@ -0,0 +1 @@
> +pm_data-offsets.h
> diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile
> index 31b61f0e1c07..de64301dcff2 100644
> --- a/arch/arm/mach-at91/Makefile
> +++ b/arch/arm/mach-at91/Makefile
> @@ -19,9 +19,10 @@ ifeq ($(CONFIG_PM_DEBUG),y)
>  CFLAGS_pm.o += -DDEBUG
>  endif
>  
> -include/generated/at91_pm_data-offsets.h: arch/arm/mach-at91/pm_data-offsets.s FORCE
> +$(obj)/pm_data-offsets.h: $(obj)/pm_data-offsets.s FORCE
>  	$(call filechk,offsets,__PM_DATA_OFFSETS_H__)
>  
> -arch/arm/mach-at91/pm_suspend.o: include/generated/at91_pm_data-offsets.h
> +$(obj)/pm_suspend.o: $(obj)/pm_data-offsets.h
>  
>  targets += pm_data-offsets.s
> +clean-files += pm_data-offsets.h
> diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
> index bfe1c4d06901..a31c1b20f3fa 100644
> --- a/arch/arm/mach-at91/pm_suspend.S
> +++ b/arch/arm/mach-at91/pm_suspend.S
> @@ -14,7 +14,7 @@
>  #include <linux/linkage.h>
>  #include <linux/clk/at91_pmc.h>
>  #include "pm.h"
> -#include "generated/at91_pm_data-offsets.h"
> +#include "pm_data-offsets.h"
>  
>  #define	SRAMC_SELF_FRESH_ACTIVE		0x01
>  #define	SRAMC_SELF_FRESH_EXIT		0x00
> -- 
> 2.17.1
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com