linux-kernel - Re: mmotm 2010-02-03-20-09 uploaded (mmap.c)

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Message-Id: <20100204105827.2270aff0.akpm@linux-foundation.org>
Date:	Thu, 4 Feb 2010 10:58:27 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	linux-kernel@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: mmotm 2010-02-03-20-09 uploaded (mmap.c)

On Thu, 04 Feb 2010 10:14:55 -0800
Randy Dunlap <rdunlap@...otime.net> wrote:

> On 02/03/10 20:09, akpm@...ux-foundation.org wrote:
> > The mm-of-the-moment snapshot 2010-02-03-20-09 has been uploaded to
> >
> >     http://userweb.kernel.org/~akpm/mmotm/
> >
> > and will soon be available at
> >
> >     git://zen-kernel.org/kernel/mmotm.git
> >
> > It contains the following patches against 2.6.33-rc6:
> 
> 
> In some config cases, this patch seems to have a problem:
>    sysctl-clean-up-vm-related-variable-declarations.patch
> 
> In mm/mmap.c:
> +#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
> +/* Used by each architecture's private code and sysctl. */
> +int sysctl_legacy_va_layout;
> +#endif
> 
> mm/mmap.c:92: error: expected identifier or '(' before numeric constant
> 
> I guess that sometimes sysctl_legacy_va_layout is a #define:
> from include/linux/mm.h:
> 
> #ifdef CONFIG_SYSCTL
> extern int sysctl_legacy_va_layout;
> #else
> #define sysctl_legacy_va_layout 0
> #endif
> 
> and indeed the failing builds do not have CONFIG_SYSCTL enabled.

Thanks.  This, I guess:

--- a/mm/mmap.c~sysctl-clean-up-vm-related-variable-declarations-fix
+++ a/mm/mmap.c
@@ -87,7 +87,7 @@ int sysctl_overcommit_ratio = 50;	/* def
 int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;
 struct percpu_counter vm_committed_as;
 
-#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
+#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) && defined(CONFIG_SYSCTL)
 /* Used by each architecture's private code and sysctl. */
 int sysctl_legacy_va_layout;
 #endif
_

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