linux-kernel - RE: [RFC PATCH 0/2] Fix linux/swap.h build wart

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Date:	Fri, 26 Oct 2007 13:38:12 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Jeff Dike" <jdike@...toit.com>,
	"LKML" <linux-kernel@...r.kernel.org>,
	<linux-fsdevel@...r.kernel.org>, <linux-arch@...r.kernel.org>
Subject: RE: [RFC PATCH 0/2] Fix linux/swap.h build wart

> These patches propose to break the recursion instead by removing the
> linux/pagemap.h -> linux/highmem.h inclusion.  I'd like to know
> whether there are any fundamental reasons that this include should be
> preserved.

Not fundamental reasons, but these patches break the ia64 build for most
configs with:

In file included from kernel/futex.c:59:
include/asm/futex.h: In function `futex_atomic_op_inuser':
include/asm/futex.h:62: error: implicit declaration of function `pagefault_disable'
include/asm/futex.h:86: error: implicit declaration of function `pagefault_enable'
make[1]: *** [kernel/futex.o] Error 1

Adding an include of <linux/uaccess.h> to kernel/futex.c is sufficient (but
not necessarily right) to unbreak this.

A few configs also fail with:
mm/migrate.c: In function `migrate_page_copy':
mm/migrate.c:359: error: implicit declaration of function `copy_highpage'
make[1]: *** [mm/migrate.o] Error 1

Making mm/migrate.c include <linux/highmem.h> fixes this one.

-Tony
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