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Date: Wed, 09 Oct 2002 09:07:23 -0700
From: Andrew Morton <akpm@digeo.com>
MIME-Version: 1.0
Subject: Re: 2.5.41-mm1 oops on boot (EIP at kmem_cache_alloc)
References: <1034177616.1306.180.camel@spc9.esa.lanl.gov>
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Sender: owner-linux-mm@kvack.org
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To: Steven Cole <elenstev@mesatop.com>
Cc: Andrew Morton <akpm@zip.com.au>, linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>

Steven Cole wrote:
> 
> Greetings,
> 
> I got an oops when booting 2.5.41-mm1 on my dual p3.

Manfred sent through an update - don't know if it will
fix this though:


--- 2.5.41/mm/slab.c~slab-split-10-list_for_each_fix	Tue Oct  8 15:40:52 2002
+++ 2.5.41-akpm/mm/slab.c	Tue Oct  8 15:40:52 2002
@@ -461,7 +461,7 @@ static kmem_cache_t cache_cache = {
 static struct semaphore	cache_chain_sem;
 static rwlock_t cache_chain_lock = RW_LOCK_UNLOCKED;
 
-#define cache_chain (cache_cache.next)
+struct list_head cache_chain;
 
 /*
  * chicken and egg problem: delay the per-cpu array allocation
@@ -617,6 +617,7 @@ void __init kmem_cache_init(void)
 
 	init_MUTEX(&cache_chain_sem);
 	INIT_LIST_HEAD(&cache_chain);
+	list_add(&cache_cache.next, &cache_chain);
 
 	cache_estimate(0, cache_cache.objsize, 0,
 			&left_over, &cache_cache.num);
@@ -2093,10 +2094,10 @@ static void *s_start(struct seq_file *m,
 	down(&cache_chain_sem);
 	if (!n)
 		return (void *)1;
-	p = &cache_cache.next;
+	p = cache_chain.next;
 	while (--n) {
 		p = p->next;
-		if (p == &cache_cache.next)
+		if (p == &cache_chain)
 			return NULL;
 	}
 	return list_entry(p, kmem_cache_t, next);
@@ -2107,9 +2108,9 @@ static void *s_next(struct seq_file *m, 
 	kmem_cache_t *cachep = p;
 	++*pos;
 	if (p == (void *)1)
-		return &cache_cache;
-	cachep = list_entry(cachep->next.next, kmem_cache_t, next);
-	return cachep == &cache_cache ? NULL : cachep;
+		return list_entry(cache_chain.next, kmem_cache_t, next);
+	return cachep->next.next == &cache_chain ? NULL
+		: list_entry(cachep->next.next, kmem_cache_t, next);
 }
 
 static void s_stop(struct seq_file *m, void *p)

.
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