linux-kernel - [PATCH] slab: remove colouroff from struct slab

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Message-ID: <Pine.LNX.4.64.0702221436460.14523@sbz-30.cs.Helsinki.FI>
Date:	Thu, 22 Feb 2007 14:37:38 +0200 (EET)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	akpm@...ux-foundation.org
cc:	linux-kernel@...r.kernel.org, wli@...omorphy.com, clameter@....com
Subject: [PATCH] slab: remove colouroff from struct slab

From: Pekka Enberg <penberg@...helsinki.fi>

As the color offset is always within the first page of the slab,
virt_to_page() works just fine without slabp->colouroff.

Cc: William Lee Irwin III <wli@...omorphy.com>
Cc: Christoph Lameter <clameter@....com>
Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
 mm/slab.c |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

Index: 2.6/mm/slab.c
===================================================================
--- 2.6.orig/mm/slab.c	2007-02-22 13:51:41.000000000 +0200
+++ 2.6/mm/slab.c	2007-02-22 13:57:39.000000000 +0200
@@ -219,7 +219,6 @@
  */
 struct slab {
 	struct list_head list;
-	unsigned long colouroff;
 	void *s_mem;		/* including colour offset */
 	unsigned int inuse;	/* num of objs active in slab */
 	kmem_bufctl_t free;
@@ -1908,18 +1907,16 @@
  */
 static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp)
 {
-	void *addr = slabp->s_mem - slabp->colouroff;
-
 	slab_destroy_objs(cachep, slabp);
 	if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) {
 		struct slab_rcu *slab_rcu;
 
 		slab_rcu = (struct slab_rcu *)slabp;
 		slab_rcu->cachep = cachep;
-		slab_rcu->addr = addr;
+		slab_rcu->addr = slabp->s_mem;
 		call_rcu(&slab_rcu->head, kmem_rcu_free);
 	} else {
-		kmem_freepages(cachep, addr);
+		kmem_freepages(cachep, slabp->s_mem);
 		if (OFF_SLAB(cachep))
 			kmem_cache_free(cachep->slabp_cache, slabp);
 	}
@@ -2585,7 +2582,6 @@
 		colour_off += cachep->slab_size;
 	}
 	slabp->inuse = 0;
-	slabp->colouroff = colour_off;
 	slabp->s_mem = objp + colour_off;
 	slabp->nodeid = nodeid;
 	return slabp;
-
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