linux-kernel - Re: mips build failures due to commit 8dd928915a73 (mips: fix up obsolete cpu function usage)

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Message-ID: <20150420210933.GB31618@fuloong-minipc.musicnaut.iki.fi>
Date:	Tue, 21 Apr 2015 00:09:33 +0300
From:	Aaro Koskinen <aaro.koskinen@....fi>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	linux-mips@...ux-mips.org
Subject: Re: mips build failures due to commit 8dd928915a73 (mips: fix up
 obsolete cpu function usage)

Hi,

On Mon, Apr 20, 2015 at 12:40:28PM -0700, Guenter Roeck wrote:
> the upstream kernel fails to build mips:nlm_xlp_defconfig,
> mips:nlm_xlp_defconfig, mips:cavium_octeon_defconfig, and possibly
> other targets, with errors such as
> 
> arch/mips/kernel/smp.c:211:2: error:
> 	passing argument 2 of 'cpumask_set_cpu' discards 'volatile' qualifier
> 	from pointer target type
> arch/mips/kernel/process.c:52:2: error:
> 	passing argument 2 of 'cpumask_test_cpu' discards 'volatile' qualifier
> 	from pointer target type
> arch/mips/cavium-octeon/smp.c:242:2: error:
> 	passing argument 2 of 'cpumask_clear_cpu' discards 'volatile' qualifier
> 	from pointer target type
> 
> The problem was introduced with commit 8dd928915a73 (" mips: fix up
> obsolete cpu function usage"). I would send a patch to fix it, but I
> am not sure if removing 'volatile' from the variable declaration(s)
> would be a good idea.

I think removing volatile from cpu_callin_map declaration should be OK,
since test_cpu (only reader) uses test_bit which takes care of it:

	static inline int test_bit(int nr, const volatile unsigned long *addr)

A.
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