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

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Date:	Tue, 19 Jan 2016 14:22:13 +0000
From:	James Hogan <james.hogan@...tec.com>
To:	Arnd Bergmann <arnd@...db.de>
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 Tue, Jan 19, 2016 at 03:09:14PM +0100, Arnd Bergmann wrote:
> 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>

Thanks Arnd

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

I was envisaging the kbuild tree tbh, but I don't really mind how it
gets merged. This patch depends on patch 1, which adds generated-y to
x86 so we don't delete their other generated headers, but other than
that it doesn't really have any dependencies.

Cheers
James

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