linux-kernel - Re: [PATCH v2 2/2] kbuild: Remove stale asm-generic wrappers

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Message-ID: <1667268.iM977TQnEK@wuerfel>
Date:	Tue, 19 Jan 2016 15:09:14 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	James Hogan <james.hogan@...tec.com>
Cc:	Michal Marek <mmarek@...e.com>, linux-kernel@...r.kernel.org,
	Heinrich Schuchardt <xypron.glpk@....de>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Paul Burton <paul.burton@...tec.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	linux-kbuild@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mips@...ux-mips.org
Subject: Re: [PATCH v2 2/2] kbuild: Remove stale asm-generic wrappers

On Tuesday 19 January 2016 13:37:50 James Hogan wrote:
> When a header file is removed from generic-y (often accompanied by the
> addition of an arch specific header), the generated wrapper file will
> persist, and in some cases may still take precedence over the new arch
> header.
> 
> For example commit f1fe2d21f4e1 ("MIPS: Add definitions for extended
> context") removed ucontext.h from generic-y in arch/mips/include/asm/,
> and added an arch/mips/include/uapi/asm/ucontext.h. The continued use of
> the wrapper when reusing a dirty build tree resulted in build failures
> in arch/mips/kernel/signal.c:
> 
> arch/mips/kernel/signal.c: In function ‘sc_to_extcontext’:
> arch/mips/kernel/signal.c:142:12: error: ‘struct ucontext’ has no member named ‘uc_extcontext’
>   return &uc->uc_extcontext;
>             ^
> 
> Fix by detecting and removing wrapper headers in generated header
> directories that do not correspond to a filename in generic-y, genhdr-y,
> or the newly introduced generated-y.

Good idea.

Acked-by: Arnd Bergmann <arnd@...db.de>

Can you merge this through the mips tree, or do you need me to pick it
up through asm-generic?