To: Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.17-rc5-mm1
References: <20060530022925.8a67b613.akpm@osdl.org>
From: Roland Dreier <rdreier@cisco.com>
Date: Tue, 30 May 2006 12:43:39 -0700
In-Reply-To: <20060530022925.8a67b613.akpm@osdl.org> (Andrew Morton's message of "Tue, 30 May 2006 02:29:25 -0700")
Message-ID: <adaac8z70yc.fsf@cisco.com>
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Building 2.6.17-rc5-mm1, I get this:

	net/built-in.o: In function `ip_rt_init':
	(.init.text+0xb04): undefined reference to `__you_cannot_kmalloc_that_much'

This seems to be coming from:

	rt_hash_locks = kmalloc(sizeof(spinlock_t) * RT_HASH_LOCK_SZ, GFP_KERNEL);

I have CONFIG_NR_CPUS=32, so RT_HASH_LOCK_SZ ends up as 2048.  Also, I
have both CONFIG_DEBUG_SPINLOCK=y and CONFIG_PROVE_SPIN_LOCKING=y so
spinlock_t is bloated up quite big:

	typedef struct {
		raw_spinlock_t raw_lock;
	#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
		unsigned int break_lock;
	#endif
	#ifdef CONFIG_DEBUG_SPINLOCK
		unsigned int magic, owner_cpu;
		void *owner;
	#endif
	#ifdef CONFIG_PROVE_SPIN_LOCKING
		struct lockdep_map dep_map;
	#endif
	} spinlock_t;

I only have 8 CPUs in the box, so updating my config from the x86_64
defconfig fixes things for me.

No patch because I don't really know how to fix this properly...

 - R.
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