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

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Message-ID: <20190823195030.GD30479@piout.net>
Date:   Fri, 23 Aug 2019 21:50:30 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        linux-arm-kernel@...ts.infradead.org,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: at91: move platform-specific asm-offset.h to
 arch/arm/mach-at91

On 23/08/2019 11:43:45+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 renamed it to arch/arm/mach-at91/pm_data-offsets.h since the prefix
> 'at91_' is just redundant in mach-at91/.
> 
> My main motivation of this change is to avoid the race condition for
> the parallel build (-j) when CONFIG_IKHEADERS is enabled.
> 
> When it is enabled, all the headers under include/ are archived into
> kernel/kheaders_data.tar.xz and exposed in the sysfs.
> 
> In the parallel build, we have no idea in which order files are built.
> 
>  - If at91_pm_data-offsets.h is built before kheaders_data.tar.xz,
>    the header will be included in the archive. Probably nobody will
>    use it, but it is harmless except that it will increase the archive
>    size needlessly.
> 
>  - If kheaders_data.tar.xz is built before at91_pm_data-offsets.h,
>    the header will not be included in the archive. However, in the next
>    build, the archive will be re-generated to include the newly-found
>    at91_pm_data-offsets.h. This is not nice from the build system point
>    of view.
> 
>  - If at91_pm_data-offsets.h and kheaders_data.tar.xz are built at the
>    same time, the corrupted header might be included in the archive,
>    which does not look nice either.
> 
> This commit fixes the race.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
> 
>  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
> 
Applied, thanks.

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