linux-kernel - Re: spi/bcm63xx: fix standard accessors and compile guard

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Date:	Tue, 13 Oct 2015 21:30:41 +0200
From:	Andreas Ziegler <andreas.ziegler@....de>
To:	Jonas Gorski <jogo@...nwrt.org>
Cc:	Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Valentin Rothberg <rothberg@...fau.de>,
	Paul Bolle <pebolle@...cali.nl>
Subject: Re: spi/bcm63xx: fix standard accessors and compile guard

Hi Jonas,

your patch "spi/bcm63xx: fix standard accessors and compile guard"
showed up as commit 682b5280bf00 in linux-next today (that is,
next-20151013). I noticed it because we (a research group from
Erlangen[0]) are running daily checks on linux-next.

Your commit fixes two #ifdef statements in drivers/spi/spi-bcm63xx.c
which involve CONFIG_CPU_BIG_ENDIAN.

>From the Makefile at drivers/spi/Makefile (line 20), we can see that the
file can only be built when CONFIG_SPI_BCM63XX is set. In the
corresponding Kconfig file (drivers/spi/Kconfig, line 137),
CONFIG_SPI_BCM63XX is defined to depend on CONFIG_BCM63XX. The latter is
defined in arch/mips/Kconfig (line 199), and selects
CONFIG_SYS_SUPPORTS_BIG_ENDIAN (but not CONFIG_SYS_SUPPORTS_LITTLE_ENDIAN).

Finally, CONFIG_CPU_BIG_ENDIAN (at arch/mips/Kconfig, line 1136) depends
on CONFIG_SYS_SUPPORTS_BIG_ENDIAN, which means that if the source file
is to be compiled, CONFIG_CPU_BIG_ENDIAN is the only possible selection
in the endianness choice. Hence, the #ifdefs are unnecessary and could
possibly be removed.

Is this correct, or am I missing something?

Best regards,

Andreas

[0] https://cados.cs.fau.de
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