On Tue, Jun 26, 2012 at 05:27:34PM +0200, Sebastian Andrzej Siewior wrote:

On Fri, Jun 22, 2012 at 03:30:36PM +0100, Mel Gorman wrote:

quoted

diff --git a/net/core/sock.c b/net/core/sock.c
index 5c9ca2b..159dccc 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c

@@ -271,6 +271,9 @@ __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
 EXPORT_SYMBOL(sysctl_optmem_max);
 
+struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
+EXPORT_SYMBOL_GPL(memalloc_socks);
+

This is used via sk_memalloc_socks() by SLAB.

From 3da9ab9972845974da114c5a6624335e6371b2d5 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 26 Jun 2012 17:18:20 +0200
Subject: [PATCH] export sk_memalloc_socks() only with CONFIG_NET

|mm/built-in.o: In function `atomic_read':
|include/asm/atomic.h:25: undefined reference to `memalloc_socks'
|include/asm/atomic.h:25: undefined reference to `memalloc_socks'
|include/asm/atomic.h:25: undefined reference to `memalloc_socks'
|include/asm/atomic.h:25: undefined reference to `memalloc_socks'
|include/asm/atomic.h:25: undefined reference to `memalloc_socks'
|mm/built-in.o:include/asm/atomic.h:25: more undefined references to `memalloc_socks' follow

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

Well caught. I had not tested build with !CONFIG_NET. I've folded in
this patch and the credits accordingly. Thanks.

-- 
Mel Gorman
SUSE Labs

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