linux-kernel - [patch] numa: fix NUMA compile error when sysfs and procfs are disabled

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Date:	Wed, 24 Aug 2011 22:55:02 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Cong Wang <amwang@...hat.com>
cc:	Randy Dunlap <rdunlap@...otime.net>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org
Subject: [patch] numa: fix NUMA compile error when sysfs and procfs are
 disabled

On Thu, 25 Aug 2011, Cong Wang wrote:

> Ah, this is because I missed the part in include/linux/node.h. :)
> 
> Below is the updated version.
> 

I've never had a problem building a kernel with CONFIG_NUMA=y and 
CONFIG_SYSFS=n since most of drivers/base/node.c is just an abstraction 
that calls into sysfs functions that will be no-ops in such a 
configuration.

The error you cite in a different thread 
(http://marc.info/?l=linux-mm&m=131098795024186) about an undefined 
reference to vmstat_text is because you have CONFIG_NUMA enabled and both 
CONFIG_SYSFS and CONFIG_PROC_FS disabled and we only define vmstat_text 
for those fs configurations since that's the only way these strings were 
ever emitted before per-node vmstat.

The correct fix is to define the array for CONFIG_NUMA as well.



numa: fix NUMA compile error when sysfs and procfs are disabled

The vmstat_text array is only defined for CONFIG_SYSFS or CONFIG_PROC_FS, 
yet it is referenced for per-node vmstat with CONFIG_NUMA:

	drivers/built-in.o: In function `node_read_vmstat':
	node.c:(.text+0x1106df): undefined reference to `vmstat_text'

in fa25c503dfa2 (mm: per-node vmstat: show proper vmstats).

Define the array for CONFIG_NUMA as well.

Reported-by: Cong Wang <amwang@...hat.com>
Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 include/linux/vmstat.h |    2 ++
 mm/vmstat.c            |    4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -258,6 +258,8 @@ static inline void refresh_zone_stat_thresholds(void) { }
 
 #endif		/* CONFIG_SMP */
 
+#if defined(CONFIG_PROC_FS) || defined(CONFIG_SYSFS) || defined(CONFIG_NUMA)
 extern const char * const vmstat_text[];
+#endif
 
 #endif /* _LINUX_VMSTAT_H */
diff --git a/mm/vmstat.c b/mm/vmstat.c
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -659,7 +659,7 @@ static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat,
 }
 #endif
 
-#if defined(CONFIG_PROC_FS) || defined(CONFIG_SYSFS)
+#if defined(CONFIG_PROC_FS) || defined(CONFIG_SYSFS) || defined(CONFIG_NUMA)
 #ifdef CONFIG_ZONE_DMA
 #define TEXT_FOR_DMA(xx) xx "_dma",
 #else
@@ -788,7 +788,7 @@ const char * const vmstat_text[] = {
 
 #endif /* CONFIG_VM_EVENTS_COUNTERS */
 };
-#endif /* CONFIG_PROC_FS || CONFIG_SYSFS */
+#endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA */
 
 
 #ifdef CONFIG_PROC_FS
--
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