Use list_entry() to get container struct from struct list_head pointers.

    Build fix for RedHat 9 kernel (5 args to remap_page_range()).

22 files changed, 123 insertions, 100 deletions

diff --git a/linux-core/drmP.h b/linux-core/drmP.h
index a6b32285..59a445ea 100644
--- a/linux-core/drmP.h
+++ b/linux-core/drmP.h
@@ -172,6 +172,15 @@
 		pos = n, n = pos->next)
 #endif
 
+#ifndef list_for_each_entry
+#define list_for_each_entry(pos, head, member)				\
+       for (pos = list_entry((head)->next, typeof(*pos), member),	\
+                    prefetch(pos->member.next);				\
+            &pos->member != (head);					\
+            pos = list_entry(pos->member.next, typeof(*pos), member),	\
+                    prefetch(pos->member.next))
+#endif
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,19)
 static inline struct page * vmalloc_to_page(void * vmalloc_addr)
 {
@@ -197,7 +206,7 @@ static inline struct page * vmalloc_to_page(void * vmalloc_addr)
 }
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+#ifndef REMAP_PAGE_RANGE_5_ARGS /* #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) */
 #define DRM_RPR_ARG(vma)
 #else
 #define DRM_RPR_ARG(vma) vma,
@@ -249,17 +258,17 @@ static inline struct page * vmalloc_to_page(void * vmalloc_addr)
 			DRM(ioremapfree)( (map)->handle, (map)->size );	\
 	} while (0)
 
-#define DRM_FIND_MAP(_map, _o)						\
-do {									\
-	struct list_head *_list;					\
-	list_for_each( _list, &dev->maplist->head ) {			\
-		drm_map_list_t *_entry = (drm_map_list_t *)_list;	\
-		if ( _entry->map &&					\
-		     _entry->map->offset == (_o) ) {			\
-			(_map) = _entry->map;				\
-			break;						\
- 		}							\
-	}								\
+#define DRM_FIND_MAP(_map, _o)								\
+do {											\
+	struct list_head *_list;							\
+	list_for_each( _list, &dev->maplist->head ) {					\
+		drm_map_list_t *_entry = list_entry( _list, drm_map_list_t, head );	\
+		if ( _entry->map &&							\
+		     _entry->map->offset == (_o) ) {					\
+			(_map) = _entry->map;						\
+			break;								\
+ 		}									\
+	}										\
 } while(0)
 #define DRM_DROP_MAP(_map)
 
diff --git a/linux-core/drm_bufs.c b/linux-core/drm_bufs.c
index b4e73699..b27987f1 100644
--- a/linux-core/drm_bufs.c
+++ b/linux-core/drm_bufs.c
@@ -211,7 +211,7 @@ int DRM(rmmap)(struct inode *inode, struct file *filp,
 	down(&dev->struct_sem);
 	list = &dev->maplist->head;
 	list_for_each(list, &dev->maplist->head) {
-		r_list = (drm_map_list_t *) list;
+		r_list = list_entry(list, drm_map_list_t, head);
 
 		if(r_list->map &&
 		   r_list->map->handle == request.handle &&
diff --git a/linux-core/drm_context.c b/linux-core/drm_context.c
index 39267b14..88b485ff 100644
--- a/linux-core/drm_context.c
+++ b/linux-core/drm_context.c
@@ -195,7 +195,7 @@ int DRM(setsareactx)(struct inode *inode, struct file *filp,
 
 	down(&dev->struct_sem);
 	list_for_each(list, &dev->maplist->head) {
-		r_list = (drm_map_list_t *)list;
+		r_list = list_entry(list, drm_map_list_t, head);
 		if(r_list->map &&
 		   r_list->map->handle == request.handle)
 			goto found;
diff --git a/linux-core/drm_dma.c b/linux-core/drm_dma.c
index 4ea6b07d..71e25b3d 100644
--- a/linux-core/drm_dma.c
+++ b/linux-core/drm_dma.c
@@ -655,7 +655,7 @@ int DRM(wait_vblank)( DRM_IOCTL_ARGS )
 		 * for the same vblank sequence number; nothing to be done in
 		 * that case
 		 */
-		list_for_each( ( (struct list_head *) vbl_sig ), &dev->vbl_sigs.head ) {
+		list_for_each_entry( vbl_sig, &dev->vbl_sigs.head, head ) {
 			if (vbl_sig->sequence == vblwait.request.sequence
 			    && vbl_sig->info.si_signo == vblwait.request.signal
 			    && vbl_sig->task == current)
@@ -706,19 +706,20 @@ done:
 
 void DRM(vbl_send_signals)( drm_device_t *dev )
 {
-	struct list_head *tmp;
+	struct list_head *list, *tmp;
 	drm_vbl_sig_t *vbl_sig;
 	unsigned int vbl_seq = atomic_read( &dev->vbl_received );
 	unsigned long flags;
 
 	spin_lock_irqsave( &dev->vbl_lock, flags );
 
-	list_for_each_safe( ( (struct list_head *) vbl_sig ), tmp, &dev->vbl_sigs.head ) {
+	list_for_each_safe( list, tmp, &dev->vbl_sigs.head ) {
+		vbl_sig = list_entry( list, drm_vbl_sig_t, head );
 		if ( ( vbl_seq - vbl_sig->sequence ) <= (1<<23) ) {
 			vbl_sig->info.si_code = vbl_seq;
 			send_sig_info( vbl_sig->info.si_signo, &vbl_sig->info, vbl_sig->task );
 
-			list_del( (struct list_head *) vbl_sig );
+			list_del( list );
 
 			DRM_FREE( vbl_sig, sizeof(*vbl_sig) );
 
diff --git a/linux-core/drm_ioctl.c b/linux-core/drm_ioctl.c
index d753cce0..9b1069a1 100644
--- a/linux-core/drm_ioctl.c
+++ b/linux-core/drm_ioctl.c
@@ -205,7 +205,7 @@ int DRM(getmap)( struct inode *inode, struct file *filp,
 	i = 0;
 	list_for_each(list, &dev->maplist->head) {
 		if(i == idx) {
-			r_list = (drm_map_list_t *)list;
+			r_list = list_entry(list, drm_map_list_t, head);
 			break;
 		}
 		i++;
diff --git a/linux-core/drm_os_linux.h b/linux-core/drm_os_linux.h
index b57efd34..b760c169 100644
--- a/linux-core/drm_os_linux.h
+++ b/linux-core/drm_os_linux.h
@@ -47,9 +47,8 @@
 
 #define DRM_GETSAREA()							 \
 do { 									 \
-	struct list_head *list;						 \
-	list_for_each( list, &dev->maplist->head ) {			 \
-		drm_map_list_t *entry = (drm_map_list_t *)list;		 \
+	drm_map_list_t *entry;						 \
+	list_for_each_entry( entry, &dev->maplist->head, head ) {	 \
 		if ( entry->map &&					 \
 		     entry->map->type == _DRM_SHM &&			 \
 		     (entry->map->flags & _DRM_CONTAINS_LOCK) ) {	 \
@@ -61,28 +60,28 @@ do { 									 \
 
 #define DRM_HZ HZ
 
-#define DRM_WAIT_ON( ret, queue, timeout, condition )	\
-do {							\
-	DECLARE_WAITQUEUE(entry, current);		\
-	unsigned long end = jiffies + (timeout);	\
-	add_wait_queue(&(queue), &entry);		\
-							\
-	for (;;) {					\
-		current->state = TASK_INTERRUPTIBLE;	\
-		if (condition) 				\
-			break;				\
-		if((signed)(end - jiffies) <= 0) {	\
-			ret = -EBUSY;			\
-			break;				\
-		}					\
+#define DRM_WAIT_ON( ret, queue, timeout, condition )		\
+do {								\
+	DECLARE_WAITQUEUE(entry, current);			\
+	unsigned long end = jiffies + (timeout);		\
+	add_wait_queue(&(queue), &entry);			\
+								\
+	for (;;) {						\
+		current->state = TASK_INTERRUPTIBLE;		\
+		if (condition)					\
+			break;					\
+		if((signed)(end - jiffies) <= 0) {		\
+			ret = -EBUSY;				\
+			break;					\
+		}						\
 		schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);	\
-		if (signal_pending(current)) {		\
-			ret = -EINTR;			\
-			break;				\
-		}					\
-	}						\
-	current->state = TASK_RUNNING;			\
-	remove_wait_queue(&(queue), &entry);		\
+		if (signal_pending(current)) {			\
+			ret = -EINTR;				\
+			break;					\
+		}						\
+	}							\
+	current->state = TASK_RUNNING;				\
+	remove_wait_queue(&(queue), &entry);			\
 } while (0)
 
 
diff --git a/linux-core/drm_proc.c b/linux-core/drm_proc.c
index 8524d204..5af8ddea 100644
--- a/linux-core/drm_proc.c
+++ b/linux-core/drm_proc.c
@@ -187,7 +187,7 @@ static int DRM(_vm_info)(char *buf, char **start, off_t offset, int request,
 		       "address mtrr\n\n");
 	i = 0;
 	if (dev->maplist != NULL) list_for_each(list, &dev->maplist->head) {
-		r_list = (drm_map_list_t *)list;
+		r_list = list_entry(list, drm_map_list_t, head);
 		map = r_list->map;
 		if(!map) continue;
 		if (map->type < 0 || map->type > 4) type = "??";
diff --git a/linux-core/drm_vm.c b/linux-core/drm_vm.c
index 9101e136..76a10cf5 100644
--- a/linux-core/drm_vm.c
+++ b/linux-core/drm_vm.c
@@ -74,7 +74,7 @@ struct page *DRM(vm_nopage)(struct vm_area_struct *vma,
 	if(!dev->agp || !dev->agp->cant_use_aperture) goto vm_nopage_error;
 
 	list_for_each(list, &dev->maplist->head) {
-		r_list = (drm_map_list_t *)list;
+		r_list = list_entry(list, drm_map_list_t, head);
 		map = r_list->map;
 		if (!map) continue;
 		if (map->offset == VM_OFFSET(vma)) break;
@@ -190,7 +190,7 @@ void DRM(vm_shm_close)(struct vm_area_struct *vma)
 		found_maps = 0;
 		list = &dev->maplist->head;
 		list_for_each(list, &dev->maplist->head) {
-			r_list = (drm_map_list_t *) list;
+			r_list = list_entry(list, drm_map_list_t, head);
 			if (r_list->map == map) found_maps++;
 		}
 
@@ -393,7 +393,7 @@ int DRM(mmap)(struct file *filp, struct vm_area_struct *vma)
 	list_for_each(list, &dev->maplist->head) {
 		unsigned long off;
 
-		r_list = (drm_map_list_t *)list;
+		r_list = list_entry(list, drm_map_list_t, head);
 		map = r_list->map;
 		if (!map) continue;
 		off = DRIVER_GET_MAP_OFS();
diff --git a/linux-core/i810_dma.c b/linux-core/i810_dma.c
index de9345e3..b0a1b6aa 100644
--- a/linux-core/i810_dma.c
+++ b/linux-core/i810_dma.c
@@ -347,7 +347,7 @@ static int i810_dma_initialize(drm_device_t *dev,
    	memset(dev_priv, 0, sizeof(drm_i810_private_t));
 
 	list_for_each(list, &dev->maplist->head) {
-		drm_map_list_t *r_list = (drm_map_list_t *)list;
+		drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
 		if( r_list->map &&
 		    r_list->map->type == _DRM_SHM &&
 		    r_list->map->flags & _DRM_CONTAINS_LOCK ) {
diff --git a/linux-core/i830_dma.c b/linux-core/i830_dma.c
index 47f10d56..1018fdcb 100644
--- a/linux-core/i830_dma.c
+++ b/linux-core/i830_dma.c
@@ -370,7 +370,7 @@ static int i830_dma_initialize(drm_device_t *dev,
    	memset(dev_priv, 0, sizeof(drm_i830_private_t));
 
 	list_for_each(list, &dev->maplist->head) {
-		drm_map_list_t *r_list = (drm_map_list_t *)list;
+		drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
 		if( r_list->map &&
 		    r_list->map->type == _DRM_SHM &&
 		    r_list->map->flags & _DRM_CONTAINS_LOCK ) {
diff --git a/linux/Makefile.linux b/linux/Makefile.linux
index 065d6f62..63bec30d 100644
--- a/linux/Makefile.linux
+++ b/linux/Makefile.linux
@@ -144,6 +144,8 @@ AGP := $(shell gcc -E -nostdinc -I$(TREE) picker.c 2>/dev/null \
 MACHINE := $(shell echo `uname -m`)
 # Red Hat's kernels have 4 args to do_munmap()
 DOMUNMAP := $(shell grep do_munmap $(TREE)/linux/mm.h | grep -c acct)
+# Red Hat 9 kernel has 5 args to remap_page_range()
+RPR := $(shell grep remap_page_range $(TREE)/linux/mm.h | grep -c vma)
 ifeq ($(AGP),0)
 AGP := $(shell gcc -E -nostdinc -I$(TREE) picker.c 2>/dev/null \
 	| grep -s 'AGP_MODULE = ' | cut -d' ' -f3)
@@ -152,6 +154,9 @@ endif
 ifeq ($(DOMUNMAP),1)
 MODCFLAGS += -DDO_MUNMAP_4_ARGS
 endif
+ifeq ($(RPR),1)
+MODCFLAGS += -DREMAP_PAGE_RANGE_5_ARGS
+endif
 ifeq ($(AGP),1)
 MODCFLAGS += -DCONFIG_AGP -DCONFIG_AGP_MODULE
 DRMTEMPLATES += drm_agpsupport.h
diff --git a/linux/drmP.h b/linux/drmP.h
index a6b32285..59a445ea 100644
--- a/linux/drmP.h
+++ b/linux/drmP.h
@@ -172,6 +172,15 @@
 		pos = n, n = pos->next)
 #endif
 
+#ifndef list_for_each_entry
+#define list_for_each_entry(pos, head, member)				\
+       for (pos = list_entry((head)->next, typeof(*pos), member),	\
+                    prefetch(pos->member.next);				\
+            &pos->member != (head);					\
+            pos = list_entry(pos->member.next, typeof(*pos), member),	\
+                    prefetch(pos->member.next))
+#endif
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,19)
 static inline struct page * vmalloc_to_page(void * vmalloc_addr)
 {
@@ -197,7 +206,7 @@ static inline struct page * vmalloc_to_page(void * vmalloc_addr)
 }
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+#ifndef REMAP_PAGE_RANGE_5_ARGS /* #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) */
 #define DRM_RPR_ARG(vma)
 #else
 #define DRM_RPR_ARG(vma) vma,
@@ -249,17 +258,17 @@ static inline struct page * vmalloc_to_page(void * vmalloc_addr)
 			DRM(ioremapfree)( (map)->handle, (map)->size );	\
 	} while (0)
 
-#define DRM_FIND_MAP(_map, _o)						\
-do {									\
-	struct list_head *_list;					\
-	list_for_each( _list, &dev->maplist->head ) {			\
-		drm_map_list_t *_entry = (drm_map_list_t *)_list;	\
-		if ( _entry->map &&					\
-		     _entry->map->offset == (_o) ) {			\
-			(_map) = _entry->map;				\
-			break;						\
- 		}							\
-	}								\
+#define DRM_FIND_MAP(_map, _o)								\
+do {											\
+	struct list_head *_list;							\
+	list_for_each( _list, &dev->maplist->head ) {					\
+		drm_map_list_t *_entry = list_entry( _list, drm_map_list_t, head );	\
+		if ( _entry->map &&							\
+		     _entry->map->offset == (_o) ) {					\
+			(_map) = _entry->map;						\
+			break;								\
+ 		}									\
+	}										\
 } while(0)
 #define DRM_DROP_MAP(_map)
 
diff --git a/linux/drm_bufs.h b/linux/drm_bufs.h
index b4e73699..b27987f1 100644
--- a/linux/drm_bufs.h
+++ b/linux/drm_bufs.h
@@ -211,7 +211,7 @@ int DRM(rmmap)(struct inode *inode, struct file *filp,
 	down(&dev->struct_sem);
 	list = &dev->maplist->head;
 	list_for_each(list, &dev->maplist->head) {
-		r_list = (drm_map_list_t *) list;
+		r_list = list_entry(list, drm_map_list_t, head);
 
 		if(r_list->map &&
 		   r_list->map->handle == request.handle &&
diff --git a/linux/drm_context.h b/linux/drm_context.h
index 39267b14..88b485ff 100644
--- a/linux/drm_context.h
+++ b/linux/drm_context.h
@@ -195,7 +195,7 @@ int DRM(setsareactx)(struct inode *inode, struct file *filp,
 
 	down(&dev->struct_sem);
 	list_for_each(list, &dev->maplist->head) {
-		r_list = (drm_map_list_t *)list;
+		r_list = list_entry(list, drm_map_list_t, head);
 		if(r_list->map &&
 		   r_list->map->handle == request.handle)
 			goto found;
diff --git a/linux/drm_dma.h b/linux/drm_dma.h
index 4ea6b07d..71e25b3d 100644
--- a/linux/drm_dma.h
+++ b/linux/drm_dma.h
@@ -655,7 +655,7 @@ int DRM(wait_vblank)( DRM_IOCTL_ARGS )
 		 * for the same vblank sequence number; nothing to be done in
 		 * that case
 		 */
-		list_for_each( ( (struct list_head *) vbl_sig ), &dev->vbl_sigs.head ) {
+		list_for_each_entry( vbl_sig, &dev->vbl_sigs.head, head ) {
 			if (vbl_sig->sequence == vblwait.request.sequence
 			    && vbl_sig->info.si_signo == vblwait.request.signal
 			    && vbl_sig->task == current)
@@ -706,19 +706,20 @@ done:
 
 void DRM(vbl_send_signals)( drm_device_t *dev )
 {
-	struct list_head *tmp;
+	struct list_head *list, *tmp;
 	drm_vbl_sig_t *vbl_sig;
 	unsigned int vbl_seq = atomic_read( &dev->vbl_received );
 	unsigned long flags;
 
 	spin_lock_irqsave( &dev->vbl_lock, flags );
 
-	list_for_each_safe( ( (struct list_head *) vbl_sig ), tmp, &dev->vbl_sigs.head ) {
+	list_for_each_safe( list, tmp, &dev->vbl_sigs.head ) {
+		vbl_sig = list_entry( list, drm_vbl_sig_t, head );
 		if ( ( vbl_seq - vbl_sig->sequence ) <= (1<<23) ) {
 			vbl_sig->info.si_code = vbl_seq;
 			send_sig_info( vbl_sig->info.si_signo, &vbl_sig->info, vbl_sig->task );
 
-			list_del( (struct list_head *) vbl_sig );
+			list_del( list );
 
 			DRM_FREE( vbl_sig, sizeof(*vbl_sig) );
 
diff --git a/linux/drm_ioctl.h b/linux/drm_ioctl.h
index d753cce0..9b1069a1 100644
--- a/linux/drm_ioctl.h
+++ b/linux/drm_ioctl.h
@@ -205,7 +205,7 @@ int DRM(getmap)( struct inode *inode, struct file *filp,
 	i = 0;
 	list_for_each(list, &dev->maplist->head) {
 		if(i == idx) {
-			r_list = (drm_map_list_t *)list;
+			r_list = list_entry(list, drm_map_list_t, head);
 			break;
 		}
 		i++;
diff --git a/linux/drm_os_linux.h b/linux/drm_os_linux.h
index b57efd34..b760c169 100644
--- a/linux/drm_os_linux.h
+++ b/linux/drm_os_linux.h
@@ -47,9 +47,8 @@
 
 #define DRM_GETSAREA()							 \
 do { 									 \
-	struct list_head *list;						 \
-	list_for_each( list, &dev->maplist->head ) {			 \
-		drm_map_list_t *entry = (drm_map_list_t *)list;		 \
+	drm_map_list_t *entry;						 \
+	list_for_each_entry( entry, &dev->maplist->head, head ) {	 \
 		if ( entry->map &&					 \
 		     entry->map->type == _DRM_SHM &&			 \
 		     (entry->map->flags & _DRM_CONTAINS_LOCK) ) {	 \
@@ -61,28 +60,28 @@ do { 									 \
 
 #define DRM_HZ HZ
 
-#define DRM_WAIT_ON( ret, queue, timeout, condition )	\
-do {							\
-	DECLARE_WAITQUEUE(entry, current);		\
-	unsigned long end = jiffies + (timeout);	\
-	add_wait_queue(&(queue), &entry);		\
-							\
-	for (;;) {					\
-		current->state = TASK_INTERRUPTIBLE;	\
-		if (condition) 				\
-			break;				\
-		if((signed)(end - jiffies) <= 0) {	\
-			ret = -EBUSY;			\
-			break;				\
-		}					\
+#define DRM_WAIT_ON( ret, queue, timeout, condition )		\
+do {								\
+	DECLARE_WAITQUEUE(entry, current);			\
+	unsigned long end = jiffies + (timeout);		\
+	add_wait_queue(&(queue), &entry);			\
+								\
+	for (;;) {						\
+		current->state = TASK_INTERRUPTIBLE;		\
+		if (condition)					\
+			break;					\
+		if((signed)(end - jiffies) <= 0) {		\
+			ret = -EBUSY;				\
+			break;					\
+		}						\
 		schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);	\
-		if (signal_pending(current)) {		\
-			ret = -EINTR;			\
-			break;				\
-		}					\
-	}						\
-	current->state = TASK_RUNNING;			\
-	remove_wait_queue(&(queue), &entry);		\
+		if (signal_pending(current)) {			\
+			ret = -EINTR;				\
+			break;					\
+		}						\
+	}							\
+	current->state = TASK_RUNNING;				\
+	remove_wait_queue(&(queue), &entry);			\
 } while (0)
 
 
diff --git a/linux/drm_proc.h b/linux/drm_proc.h
index 8524d204..5af8ddea 100644
--- a/linux/drm_proc.h
+++ b/linux/drm_proc.h
@@ -187,7 +187,7 @@ static int DRM(_vm_info)(char *buf, char **start, off_t offset, int request,
 		       "address mtrr\n\n");
 	i = 0;
 	if (dev->maplist != NULL) list_for_each(list, &dev->maplist->head) {
-		r_list = (drm_map_list_t *)list;
+		r_list = list_entry(list, drm_map_list_t, head);
 		map = r_list->map;
 		if(!map) continue;
 		if (map->type < 0 || map->type > 4) type = "??";
diff --git a/linux/drm_vm.h b/linux/drm_vm.h
index 9101e136..76a10cf5 100644
--- a/linux/drm_vm.h
+++ b/linux/drm_vm.h
@@ -74,7 +74,7 @@ struct page *DRM(vm_nopage)(struct vm_area_struct *vma,
 	if(!dev->agp || !dev->agp->cant_use_aperture) goto vm_nopage_error;
 
 	list_for_each(list, &dev->maplist->head) {
-		r_list = (drm_map_list_t *)list;
+		r_list = list_entry(list, drm_map_list_t, head);
 		map = r_list->map;
 		if (!map) continue;
 		if (map->offset == VM_OFFSET(vma)) break;
@@ -190,7 +190,7 @@ void DRM(vm_shm_close)(struct vm_area_struct *vma)
 		found_maps = 0;
 		list = &dev->maplist->head;
 		list_for_each(list, &dev->maplist->head) {
-			r_list = (drm_map_list_t *) list;
+			r_list = list_entry(list, drm_map_list_t, head);
 			if (r_list->map == map) found_maps++;
 		}
 
@@ -393,7 +393,7 @@ int DRM(mmap)(struct file *filp, struct vm_area_struct *vma)
 	list_for_each(list, &dev->maplist->head) {
 		unsigned long off;
 
-		r_list = (drm_map_list_t *)list;
+		r_list = list_entry(list, drm_map_list_t, head);
 		map = r_list->map;
 		if (!map) continue;
 		off = DRIVER_GET_MAP_OFS();
diff --git a/linux/gamma_dma.c b/linux/gamma_dma.c
index a3c21d11..5b4d84bc 100644
--- a/linux/gamma_dma.c
+++ b/linux/gamma_dma.c
@@ -607,7 +607,7 @@ static int gamma_do_init_dma( drm_device_t *dev, drm_gamma_init_t *init )
 	memset( dev_priv, 0, sizeof(drm_gamma_private_t) );
 
 	list_for_each(list, &dev->maplist->head) {
-		drm_map_list_t *r_list = (drm_map_list_t *)list;
+		drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
 		if( r_list->map &&
 		    r_list->map->type == _DRM_SHM &&
 		    r_list->map->flags & _DRM_CONTAINS_LOCK ) {
@@ -811,7 +811,7 @@ int gamma_setsareactx(struct inode *inode, struct file *filp,
 	down(&dev->struct_sem);
 	r_list = NULL;
 	list_for_each(list, &dev->maplist->head) {
-		r_list = (drm_map_list_t *)list;
+		r_list = list_entry(list, drm_map_list_t, head);
 		if(r_list->map &&
 		   r_list->map->handle == request.handle) break;
 	}
diff --git a/linux/i810_dma.c b/linux/i810_dma.c
index de9345e3..b0a1b6aa 100644
--- a/linux/i810_dma.c
+++ b/linux/i810_dma.c
@@ -347,7 +347,7 @@ static int i810_dma_initialize(drm_device_t *dev,
    	memset(dev_priv, 0, sizeof(drm_i810_private_t));
 
 	list_for_each(list, &dev->maplist->head) {
-		drm_map_list_t *r_list = (drm_map_list_t *)list;
+		drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
 		if( r_list->map &&
 		    r_list->map->type == _DRM_SHM &&
 		    r_list->map->flags & _DRM_CONTAINS_LOCK ) {
diff --git a/linux/i830_dma.c b/linux/i830_dma.c
index 47f10d56..1018fdcb 100644
--- a/linux/i830_dma.c
+++ b/linux/i830_dma.c
@@ -370,7 +370,7 @@ static int i830_dma_initialize(drm_device_t *dev,
    	memset(dev_priv, 0, sizeof(drm_i830_private_t));
 
 	list_for_each(list, &dev->maplist->head) {
-		drm_map_list_t *r_list = (drm_map_list_t *)list;
+		drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
 		if( r_list->map &&
 		    r_list->map->type == _DRM_SHM &&
 		    r_list->map->flags & _DRM_CONTAINS_LOCK ) {