linux-kernel - [PATCH] Enable dmapool debugging for CONFIG_SLUB_DEBUG

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Date:	Tue, 11 Mar 2008 02:34:44 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org, akpm@...l.org, clameter@....com,
	willy@...ux.intel.com
Subject: [PATCH] Enable dmapool debugging for CONFIG_SLUB_DEBUG_ON too

Enable dmapool debugging for CONFIG_SLUB_DEBUG_ON too

Previously it was only enabled for CONFIG_SLAB_DEBUG.

Not hooked into the slub runtime debug configuration, so you currently
only get it with CONFIG_SLUB_DEBUG_ON, not plain CONFIG_SLUB_DEBUG

Signed-off-by: Andi Kleen <ak@...e.de>

Index: linux/mm/dmapool.c
===================================================================
--- linux.orig/mm/dmapool.c
+++ linux/mm/dmapool.c
@@ -37,6 +37,10 @@
 #include <linux/types.h>
 #include <linux/wait.h>
 
+#if defined(CONFIG_SLAB_DEBUG) || defined(CONFIG_SLUB_DEBUG_ON)
+#define DMAPOOL_DEBUG 1
+#endif
+
 struct dma_pool {		/* the pool */
 	struct list_head page_list;
 	spinlock_t lock;
@@ -216,7 +220,7 @@ static struct dma_page *pool_alloc_page(
 	page->vaddr = dma_alloc_coherent(pool->dev, pool->allocation,
 					 &page->dma, mem_flags);
 	if (page->vaddr) {
-#ifdef	CONFIG_DEBUG_SLAB
+#ifdef	DMAPOOL_DEBUG
 		memset(page->vaddr, POOL_POISON_FREED, pool->allocation);
 #endif
 		pool_initialise_page(pool, page);
@@ -239,7 +243,7 @@ static void pool_free_page(struct dma_po
 {
 	dma_addr_t dma = page->dma;
 
-#ifdef	CONFIG_DEBUG_SLAB
+#ifdef	DMAPOOL_DEBUG
 	memset(page->vaddr, POOL_POISON_FREED, pool->allocation);
 #endif
 	dma_free_coherent(pool->dev, pool->allocation, page->vaddr, dma);
@@ -336,7 +340,7 @@ void *dma_pool_alloc(struct dma_pool *po
 	page->offset = *(int *)(page->vaddr + offset);
 	retval = offset + page->vaddr;
 	*handle = offset + page->dma;
-#ifdef	CONFIG_DEBUG_SLAB
+#ifdef	DMAPOOL_DEBUG
 	memset(retval, POOL_POISON_ALLOCATED, pool->size);
 #endif
  done:
@@ -391,7 +395,7 @@ void dma_pool_free(struct dma_pool *pool
 	}
 
 	offset = vaddr - page->vaddr;
-#ifdef	CONFIG_DEBUG_SLAB
+#ifdef	DMAPOOL_DEBUG
 	if ((dma - page->dma) != offset) {
 		if (pool->dev)
 			dev_err(pool->dev,
--
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