[POWERPC] Change rheap functions to use ulongs instead of pointers

The rheap allocation functions return a pointer, but the actual value is based
on how the heap was initialized, and so it can be anything, e.g. an offset
into a buffer.  A ulong is a better representation of the value returned by
the allocation functions.

This patch changes all of the relevant rheap functions to use a unsigned long
integers instead of a pointer.  In case of an error, the value returned is
a negative error code that has been cast to an unsigned long.  The caller can
use the IS_ERR_VALUE() macro to check for this.

All code which calls the rheap functions is updated accordingly.  Macros
IS_MURAM_ERR() and IS_DPERR(), have been deleted in favor of IS_ERR_VALUE().

Also added error checking to rh_attach_region().

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

9 files changed, 179 insertions, 160 deletions

diff --git a/arch/powerpc/lib/rheap.c b/arch/powerpc/lib/rheap.c
index 6c5c5dd..b2f6dcc 100644
--- a/arch/powerpc/lib/rheap.c
+++ b/arch/powerpc/lib/rheap.c
@@ -133,7 +133,7 @@ static rh_block_t *get_slot(rh_info_t * info)
 	info->empty_slots--;
 
 	/* Initialize */
-	blk->start = NULL;
+	blk->start = 0;
 	blk->size = 0;
 	blk->owner = NULL;
 
@@ -158,7 +158,7 @@ static void attach_free_block(rh_info_t * info, rh_block_t * blkn)
 
 	/* We assume that they are aligned properly */
 	size = blkn->size;
-	s = (unsigned long)blkn->start;
+	s = blkn->start;
 	e = s + size;
 
 	/* Find the blocks immediately before and after the given one
@@ -170,7 +170,7 @@ static void attach_free_block(rh_info_t * info, rh_block_t * blkn)
 	list_for_each(l, &info->free_list) {
 		blk = list_entry(l, rh_block_t, list);
 
-		bs = (unsigned long)blk->start;
+		bs = blk->start;
 		be = bs + blk->size;
 
 		if (next == NULL && s >= bs)
@@ -188,10 +188,10 @@ static void attach_free_block(rh_info_t * info, rh_block_t * blkn)
 	}
 
 	/* Now check if they are really adjacent */
-	if (before != NULL && s != (unsigned long)before->start + before->size)
+	if (before && s != (before->start + before->size))
 		before = NULL;
 
-	if (after != NULL && e != (unsigned long)after->start)
+	if (after && e != after->start)
 		after = NULL;
 
 	/* No coalescing; list insert and return */
@@ -216,7 +216,7 @@ static void attach_free_block(rh_info_t * info, rh_block_t * blkn)
 
 	/* Grow the after block backwards */
 	if (before == NULL && after != NULL) {
-		after->start = (int8_t *)after->start - size;
+		after->start -= size;
 		after->size += size;
 		return;
 	}
@@ -321,14 +321,14 @@ void rh_init(rh_info_t * info, unsigned int alignment, int max_blocks,
 }
 
 /* Attach a free memory region, coalesces regions if adjuscent */
-int rh_attach_region(rh_info_t * info, void *start, int size)
+int rh_attach_region(rh_info_t * info, unsigned long start, int size)
 {
 	rh_block_t *blk;
 	unsigned long s, e, m;
 	int r;
 
 	/* The region must be aligned */
-	s = (unsigned long)start;
+	s = start;
 	e = s + size;
 	m = info->alignment - 1;
 
@@ -338,9 +338,12 @@ int rh_attach_region(rh_info_t * info, void *start, int size)
 	/* Round end down */
 	e = e & ~m;
 
+	if (IS_ERR_VALUE(e) || (e < s))
+		return -ERANGE;
+
 	/* Take final values */
-	start = (void *)s;
-	size = (int)(e - s);
+	start = s;
+	size = e - s;
 
 	/* Grow the blocks, if needed */
 	r = assure_empty(info, 1);
@@ -358,7 +361,7 @@ int rh_attach_region(rh_info_t * info, void *start, int size)
 }
 
 /* Detatch given address range, splits free block if needed. */
-void *rh_detach_region(rh_info_t * info, void *start, int size)
+unsigned long rh_detach_region(rh_info_t * info, unsigned long start, int size)
 {
 	struct list_head *l;
 	rh_block_t *blk, *newblk;
@@ -366,10 +369,10 @@ void *rh_detach_region(rh_info_t * info, void *start, int size)
 
 	/* Validate size */
 	if (size <= 0)
-		return ERR_PTR(-EINVAL);
+		return (unsigned long) -EINVAL;
 
 	/* The region must be aligned */
-	s = (unsigned long)start;
+	s = start;
 	e = s + size;
 	m = info->alignment - 1;
 
@@ -380,34 +383,34 @@ void *rh_detach_region(rh_info_t * info, void *start, int size)
 	e = e & ~m;
 
 	if (assure_empty(info, 1) < 0)
-		return ERR_PTR(-ENOMEM);
+		return (unsigned long) -ENOMEM;
 
 	blk = NULL;
 	list_for_each(l, &info->free_list) {
 		blk = list_entry(l, rh_block_t, list);
 		/* The range must lie entirely inside one free block */
-		bs = (unsigned long)blk->start;
-		be = (unsigned long)blk->start + blk->size;
+		bs = blk->start;
+		be = blk->start + blk->size;
 		if (s >= bs && e <= be)
 			break;
 		blk = NULL;
 	}
 
 	if (blk == NULL)
-		return ERR_PTR(-ENOMEM);
+		return (unsigned long) -ENOMEM;
 
 	/* Perfect fit */
 	if (bs == s && be == e) {
 		/* Delete from free list, release slot */
 		list_del(&blk->list);
 		release_slot(info, blk);
-		return (void *)s;
+		return s;
 	}
 
 	/* blk still in free list, with updated start and/or size */
 	if (bs == s || be == e) {
 		if (bs == s)
-			blk->start = (int8_t *)blk->start + size;
+			blk->start += size;
 		blk->size -= size;
 
 	} else {
@@ -416,25 +419,29 @@ void *rh_detach_region(rh_info_t * info, void *start, int size)
 
 		/* the back free fragment */
 		newblk = get_slot(info);
-		newblk->start = (void *)e;
+		newblk->start = e;
 		newblk->size = be - e;
 
 		list_add(&newblk->list, &blk->list);
 	}
 
-	return (void *)s;
+	return s;
 }
 
-void *rh_alloc_align(rh_info_t * info, int size, int alignment, const char *owner)
+/* Allocate a block of memory at the specified alignment.  The value returned
+ * is an offset into the buffer initialized by rh_init(), or a negative number
+ * if there is an error.
+ */
+unsigned long rh_alloc_align(rh_info_t * info, int size, int alignment, const char *owner)
 {
 	struct list_head *l;
 	rh_block_t *blk;
 	rh_block_t *newblk;
-	void *start;
+	unsigned long start;
 
-	/* Validate size, (must be power of two) */
+	/* Validate size, and alignment must be power of two */
 	if (size <= 0 || (alignment & (alignment - 1)) != 0)
-		return ERR_PTR(-EINVAL);
+		return (unsigned long) -EINVAL;
 
 	/* given alignment larger that default rheap alignment */
 	if (alignment > info->alignment)
@@ -444,7 +451,7 @@ void *rh_alloc_align(rh_info_t * info, int size, int alignment, const char *owne
 	size = (size + (info->alignment - 1)) & ~(info->alignment - 1);
 
 	if (assure_empty(info, 1) < 0)
-		return ERR_PTR(-ENOMEM);
+		return (unsigned long) -ENOMEM;
 
 	blk = NULL;
 	list_for_each(l, &info->free_list) {
@@ -455,7 +462,7 @@ void *rh_alloc_align(rh_info_t * info, int size, int alignment, const char *owne
 	}
 
 	if (blk == NULL)
-		return ERR_PTR(-ENOMEM);
+		return (unsigned long) -ENOMEM;
 
 	/* Just fits */
 	if (blk->size == size) {
@@ -475,7 +482,7 @@ void *rh_alloc_align(rh_info_t * info, int size, int alignment, const char *owne
 	newblk->owner = owner;
 
 	/* blk still in free list, with updated start, size */
-	blk->start = (int8_t *)blk->start + size;
+	blk->start += size;
 	blk->size -= size;
 
 	start = newblk->start;
@@ -486,19 +493,25 @@ void *rh_alloc_align(rh_info_t * info, int size, int alignment, const char *owne
 	/* this is no problem with the deallocator since */
 	/* we scan for pointers that lie in the blocks   */
 	if (alignment > info->alignment)
-		start = (void *)(((unsigned long)start + alignment - 1) &
-				~(alignment - 1));
+		start = (start + alignment - 1) & ~(alignment - 1);
 
 	return start;
 }
 
-void *rh_alloc(rh_info_t * info, int size, const char *owner)
+/* Allocate a block of memory at the default alignment.  The value returned is
+ * an offset into the buffer initialized by rh_init(), or a negative number if
+ * there is an error.
+ */
+unsigned long rh_alloc(rh_info_t * info, int size, const char *owner)
 {
 	return rh_alloc_align(info, size, info->alignment, owner);
 }
 
-/* allocate at precisely the given address */
-void *rh_alloc_fixed(rh_info_t * info, void *start, int size, const char *owner)
+/* Allocate a block of memory at the given offset, rounded up to the default
+ * alignment.  The value returned is an offset into the buffer initialized by
+ * rh_init(), or a negative number if there is an error.
+ */
+unsigned long rh_alloc_fixed(rh_info_t * info, unsigned long start, int size, const char *owner)
 {
 	struct list_head *l;
 	rh_block_t *blk, *newblk1, *newblk2;
@@ -506,10 +519,10 @@ void *rh_alloc_fixed(rh_info_t * info, void *start, int size, const char *owner)
 
 	/* Validate size */
 	if (size <= 0)
-		return ERR_PTR(-EINVAL);
+		return (unsigned long) -EINVAL;
 
 	/* The region must be aligned */
-	s = (unsigned long)start;
+	s = start;
 	e = s + size;
 	m = info->alignment - 1;
 
@@ -520,20 +533,20 @@ void *rh_alloc_fixed(rh_info_t * info, void *start, int size, const char *owner)
 	e = e & ~m;
 
 	if (assure_empty(info, 2) < 0)
-		return ERR_PTR(-ENOMEM);
+		return (unsigned long) -ENOMEM;
 
 	blk = NULL;
 	list_for_each(l, &info->free_list) {
 		blk = list_entry(l, rh_block_t, list);
 		/* The range must lie entirely inside one free block */
-		bs = (unsigned long)blk->start;
-		be = (unsigned long)blk->start + blk->size;
+		bs = blk->start;
+		be = blk->start + blk->size;
 		if (s >= bs && e <= be)
 			break;
 	}
 
 	if (blk == NULL)
-		return ERR_PTR(-ENOMEM);
+		return (unsigned long) -ENOMEM;
 
 	/* Perfect fit */
 	if (bs == s && be == e) {
@@ -551,7 +564,7 @@ void *rh_alloc_fixed(rh_info_t * info, void *start, int size, const char *owner)
 	/* blk still in free list, with updated start and/or size */
 	if (bs == s || be == e) {
 		if (bs == s)
-			blk->start = (int8_t *)blk->start + size;
+			blk->start += size;
 		blk->size -= size;
 
 	} else {
@@ -560,14 +573,14 @@ void *rh_alloc_fixed(rh_info_t * info, void *start, int size, const char *owner)
 
 		/* The back free fragment */
 		newblk2 = get_slot(info);
-		newblk2->start = (void *)e;
+		newblk2->start = e;
 		newblk2->size = be - e;
 
 		list_add(&newblk2->list, &blk->list);
 	}
 
 	newblk1 = get_slot(info);
-	newblk1->start = (void *)s;
+	newblk1->start = s;
 	newblk1->size = e - s;
 	newblk1->owner = owner;
 
@@ -577,7 +590,11 @@ void *rh_alloc_fixed(rh_info_t * info, void *start, int size, const char *owner)
 	return start;
 }
 
-int rh_free(rh_info_t * info, void *start)
+/* Deallocate the memory previously allocated by one of the rh_alloc functions.
+ * The return value is the size of the deallocated block, or a negative number
+ * if there is an error.
+ */
+int rh_free(rh_info_t * info, unsigned long start)
 {
 	rh_block_t *blk, *blk2;
 	struct list_head *l;
@@ -642,7 +659,7 @@ int rh_get_stats(rh_info_t * info, int what, int max_stats, rh_stats_t * stats)
 	return nr;
 }
 
-int rh_set_owner(rh_info_t * info, void *start, const char *owner)
+int rh_set_owner(rh_info_t * info, unsigned long start, const char *owner)
 {
 	rh_block_t *blk, *blk2;
 	struct list_head *l;
@@ -684,8 +701,8 @@ void rh_dump(rh_info_t * info)
 		nr = maxnr;
 	for (i = 0; i < nr; i++)
 		printk(KERN_INFO
-		       "    0x%p-0x%p (%u)\n",
-		       st[i].start, (int8_t *) st[i].start + st[i].size,
+		       "    0x%lx-0x%lx (%u)\n",
+		       st[i].start, st[i].start + st[i].size,
 		       st[i].size);
 	printk(KERN_INFO "\n");
 
@@ -695,8 +712,8 @@ void rh_dump(rh_info_t * info)
 		nr = maxnr;
 	for (i = 0; i < nr; i++)
 		printk(KERN_INFO
-		       "    0x%p-0x%p (%u) %s\n",
-		       st[i].start, (int8_t *) st[i].start + st[i].size,
+		       "    0x%lx-0x%lx (%u) %s\n",
+		       st[i].start, st[i].start + st[i].size,
 		       st[i].size, st[i].owner != NULL ? st[i].owner : "");
 	printk(KERN_INFO "\n");
 }
@@ -704,6 +721,6 @@ void rh_dump(rh_info_t * info)
 void rh_dump_blk(rh_info_t * info, rh_block_t * blk)
 {
 	printk(KERN_INFO
-	       "blk @0x%p: 0x%p-0x%p (%u)\n",
-	       blk, blk->start, (int8_t *) blk->start + blk->size, blk->size);
+	       "blk @0x%p: 0x%lx-0x%lx (%u)\n",
+	       blk, blk->start, blk->start + blk->size, blk->size);
 }
diff --git a/arch/powerpc/sysdev/commproc.c b/arch/powerpc/sysdev/commproc.c
index 9b4fafd..4f67b89 100644
--- a/arch/powerpc/sysdev/commproc.c
+++ b/arch/powerpc/sysdev/commproc.c
@@ -330,7 +330,7 @@ void m8xx_cpm_dpinit(void)
 	 * with the processor and the microcode patches applied / activated.
 	 * But the following should be at least safe.
 	 */
-	rh_attach_region(&cpm_dpmem_info, (void *)CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE);
+	rh_attach_region(&cpm_dpmem_info, CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE);
 }
 
 /*
@@ -338,9 +338,9 @@ void m8xx_cpm_dpinit(void)
  * This function returns an offset into the DPRAM area.
  * Use cpm_dpram_addr() to get the virtual address of the area.
  */
-uint cpm_dpalloc(uint size, uint align)
+unsigned long cpm_dpalloc(uint size, uint align)
 {
-	void *start;
+	unsigned long start;
 	unsigned long flags;
 
 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
@@ -352,30 +352,30 @@ uint cpm_dpalloc(uint size, uint align)
 }
 EXPORT_SYMBOL(cpm_dpalloc);
 
-int cpm_dpfree(uint offset)
+int cpm_dpfree(unsigned long offset)
 {
 	int ret;
 	unsigned long flags;
 
 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
-	ret = rh_free(&cpm_dpmem_info, (void *)offset);
+	ret = rh_free(&cpm_dpmem_info, offset);
 	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 
 	return ret;
 }
 EXPORT_SYMBOL(cpm_dpfree);
 
-uint cpm_dpalloc_fixed(uint offset, uint size, uint align)
+unsigned long cpm_dpalloc_fixed(unsigned long offset, uint size, uint align)
 {
-	void *start;
+	unsigned long start;
 	unsigned long flags;
 
 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
 	cpm_dpmem_info.alignment = align;
-	start = rh_alloc_fixed(&cpm_dpmem_info, (void *)offset, size, "commproc");
+	start = rh_alloc_fixed(&cpm_dpmem_info, offset, size, "commproc");
 	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 
-	return (uint)start;
+	return start;
 }
 EXPORT_SYMBOL(cpm_dpalloc_fixed);
 
@@ -385,7 +385,7 @@ void cpm_dpdump(void)
 }
 EXPORT_SYMBOL(cpm_dpdump);
 
-void *cpm_dpram_addr(uint offset)
+void *cpm_dpram_addr(unsigned long offset)
 {
 	return (void *)(dpram_vbase + offset);
 }
diff --git a/arch/powerpc/sysdev/cpm2_common.c b/arch/powerpc/sysdev/cpm2_common.c
index ec26599..9244129 100644
--- a/arch/powerpc/sysdev/cpm2_common.c
+++ b/arch/powerpc/sysdev/cpm2_common.c
@@ -248,15 +248,14 @@ static void cpm2_dpinit(void)
 	 * varies with the processor and the microcode patches activated.
 	 * But the following should be at least safe.
 	 */
-	rh_attach_region(&cpm_dpmem_info, (void *)CPM_DATAONLY_BASE,
-			CPM_DATAONLY_SIZE);
+	rh_attach_region(&cpm_dpmem_info, CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE);
 }
 
 /* This function returns an index into the DPRAM area.
  */
-uint cpm_dpalloc(uint size, uint align)
+unsigned long cpm_dpalloc(uint size, uint align)
 {
-	void *start;
+	unsigned long start;
 	unsigned long flags;
 
 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
@@ -268,13 +267,13 @@ uint cpm_dpalloc(uint size, uint align)
 }
 EXPORT_SYMBOL(cpm_dpalloc);
 
-int cpm_dpfree(uint offset)
+int cpm_dpfree(unsigned long offset)
 {
 	int ret;
 	unsigned long flags;
 
 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
-	ret = rh_free(&cpm_dpmem_info, (void *)offset);
+	ret = rh_free(&cpm_dpmem_info, offset);
 	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 
 	return ret;
@@ -282,17 +281,17 @@ int cpm_dpfree(uint offset)
 EXPORT_SYMBOL(cpm_dpfree);
 
 /* not sure if this is ever needed */
-uint cpm_dpalloc_fixed(uint offset, uint size, uint align)
+unsigned long cpm_dpalloc_fixed(unsigned long offset, uint size, uint align)
 {
-	void *start;
+	unsigned long start;
 	unsigned long flags;
 
 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
 	cpm_dpmem_info.alignment = align;
-	start = rh_alloc_fixed(&cpm_dpmem_info, (void *)offset, size, "commproc");
+	start = rh_alloc_fixed(&cpm_dpmem_info, offset, size, "commproc");
 	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 
-	return (uint)start;
+	return start;
 }
 EXPORT_SYMBOL(cpm_dpalloc_fixed);
 
@@ -302,7 +301,7 @@ void cpm_dpdump(void)
 }
 EXPORT_SYMBOL(cpm_dpdump);
 
-void *cpm_dpram_addr(uint offset)
+void *cpm_dpram_addr(unsigned long offset)
 {
 	return (void *)(im_dprambase + offset);
 }
diff --git a/arch/powerpc/sysdev/qe_lib/qe.c b/arch/powerpc/sysdev/qe_lib/qe.c
index 7f4c075..90f8740 100644
--- a/arch/powerpc/sysdev/qe_lib/qe.c
+++ b/arch/powerpc/sysdev/qe_lib/qe.c
@@ -244,7 +244,7 @@ EXPORT_SYMBOL(qe_put_snum);
 static int qe_sdma_init(void)
 {
 	struct sdma *sdma = &qe_immr->sdma;
-	u32 sdma_buf_offset;
+	unsigned long sdma_buf_offset;
 
 	if (!sdma)
 		return -ENODEV;
@@ -252,10 +252,10 @@ static int qe_sdma_init(void)
 	/* allocate 2 internal temporary buffers (512 bytes size each) for
 	 * the SDMA */
  	sdma_buf_offset = qe_muram_alloc(512 * 2, 4096);
-	if (IS_MURAM_ERR(sdma_buf_offset))
+	if (IS_ERR_VALUE(sdma_buf_offset))
 		return -ENOMEM;
 
-	out_be32(&sdma->sdebcr, sdma_buf_offset & QE_SDEBCR_BA_MASK);
+	out_be32(&sdma->sdebcr, (u32) sdma_buf_offset & QE_SDEBCR_BA_MASK);
  	out_be32(&sdma->sdmr, (QE_SDMR_GLB_1_MSK |
  					(0x1 << QE_SDMR_CEN_SHIFT)));
 
@@ -291,33 +291,32 @@ static void qe_muram_init(void)
 	if ((np = of_find_node_by_name(NULL, "data-only")) != NULL) {
 		address = *of_get_address(np, 0, &size, &flags);
 		of_node_put(np);
-		rh_attach_region(&qe_muram_info,
-			(void *)address, (int)size);
+		rh_attach_region(&qe_muram_info, address, (int) size);
 	}
 }
 
 /* This function returns an index into the MURAM area.
  */
-u32 qe_muram_alloc(u32 size, u32 align)
+unsigned long qe_muram_alloc(int size, int align)
 {
-	void *start;
+	unsigned long start;
 	unsigned long flags;
 
 	spin_lock_irqsave(&qe_muram_lock, flags);
 	start = rh_alloc_align(&qe_muram_info, size, align, "QE");
 	spin_unlock_irqrestore(&qe_muram_lock, flags);
 
-	return (u32) start;
+	return start;
 }
 EXPORT_SYMBOL(qe_muram_alloc);
 
-int qe_muram_free(u32 offset)
+int qe_muram_free(unsigned long offset)
 {
 	int ret;
 	unsigned long flags;
 
 	spin_lock_irqsave(&qe_muram_lock, flags);
-	ret = rh_free(&qe_muram_info, (void *)offset);
+	ret = rh_free(&qe_muram_info, offset);
 	spin_unlock_irqrestore(&qe_muram_lock, flags);
 
 	return ret;
@@ -325,16 +324,16 @@ int qe_muram_free(u32 offset)
 EXPORT_SYMBOL(qe_muram_free);
 
 /* not sure if this is ever needed */
-u32 qe_muram_alloc_fixed(u32 offset, u32 size)
+unsigned long qe_muram_alloc_fixed(unsigned long offset, int size)
 {
-	void *start;
+	unsigned long start;
 	unsigned long flags;
 
 	spin_lock_irqsave(&qe_muram_lock, flags);
-	start = rh_alloc_fixed(&qe_muram_info, (void *)offset, size, "commproc");
+	start = rh_alloc_fixed(&qe_muram_info, offset, size, "commproc");
 	spin_unlock_irqrestore(&qe_muram_lock, flags);
 
-	return (u32) start;
+	return start;
 }
 EXPORT_SYMBOL(qe_muram_alloc_fixed);
 
@@ -344,7 +343,7 @@ void qe_muram_dump(void)
 }
 EXPORT_SYMBOL(qe_muram_dump);
 
-void *qe_muram_addr(u32 offset)
+void *qe_muram_addr(unsigned long offset)
 {
 	return (void *)&qe_immr->muram[offset];
 }
diff --git a/arch/powerpc/sysdev/qe_lib/ucc_fast.c b/arch/powerpc/sysdev/qe_lib/ucc_fast.c
index 66137bf..9143236 100644
--- a/arch/powerpc/sysdev/qe_lib/ucc_fast.c
+++ b/arch/powerpc/sysdev/qe_lib/ucc_fast.c
@@ -18,6 +18,7 @@
 #include <linux/slab.h>
 #include <linux/stddef.h>
 #include <linux/interrupt.h>
+#include <linux/err.h>
 
 #include <asm/io.h>
 #include <asm/immap_qe.h>
@@ -268,7 +269,7 @@ int ucc_fast_init(struct ucc_fast_info * uf_info, struct ucc_fast_private ** ucc
 	/* Allocate memory for Tx Virtual Fifo */
 	uccf->ucc_fast_tx_virtual_fifo_base_offset =
 	    qe_muram_alloc(uf_info->utfs, UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
-	if (IS_MURAM_ERR(uccf->ucc_fast_tx_virtual_fifo_base_offset)) {
+	if (IS_ERR_VALUE(uccf->ucc_fast_tx_virtual_fifo_base_offset)) {
 		printk(KERN_ERR "%s: cannot allocate MURAM for TX FIFO", __FUNCTION__);
 		uccf->ucc_fast_tx_virtual_fifo_base_offset = 0;
 		ucc_fast_free(uccf);
@@ -280,7 +281,7 @@ int ucc_fast_init(struct ucc_fast_info * uf_info, struct ucc_fast_private ** ucc
 		qe_muram_alloc(uf_info->urfs +
 			   UCC_FAST_RECEIVE_VIRTUAL_FIFO_SIZE_FUDGE_FACTOR,
 			   UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
-	if (IS_MURAM_ERR(uccf->ucc_fast_rx_virtual_fifo_base_offset)) {
+	if (IS_ERR_VALUE(uccf->ucc_fast_rx_virtual_fifo_base_offset)) {
 		printk(KERN_ERR "%s: cannot allocate MURAM for RX FIFO", __FUNCTION__);
 		uccf->ucc_fast_rx_virtual_fifo_base_offset = 0;
 		ucc_fast_free(uccf);
diff --git a/arch/powerpc/sysdev/qe_lib/ucc_slow.c b/arch/powerpc/sysdev/qe_lib/ucc_slow.c
index b930d68..1f65c26 100644
--- a/arch/powerpc/sysdev/qe_lib/ucc_slow.c
+++ b/arch/powerpc/sysdev/qe_lib/ucc_slow.c
@@ -18,6 +18,7 @@
 #include <linux/slab.h>
 #include <linux/stddef.h>
 #include <linux/interrupt.h>
+#include <linux/err.h>
 
 #include <asm/io.h>
 #include <asm/immap_qe.h>
@@ -175,7 +176,7 @@ int ucc_slow_init(struct ucc_slow_info * us_info, struct ucc_slow_private ** ucc
 	/* Get PRAM base */
 	uccs->us_pram_offset =
 		qe_muram_alloc(UCC_SLOW_PRAM_SIZE, ALIGNMENT_OF_UCC_SLOW_PRAM);
-	if (IS_MURAM_ERR(uccs->us_pram_offset)) {
+	if (IS_ERR_VALUE(uccs->us_pram_offset)) {
 		printk(KERN_ERR "%s: cannot allocate MURAM for PRAM", __FUNCTION__);
 		ucc_slow_free(uccs);
 		return -ENOMEM;
@@ -210,7 +211,7 @@ int ucc_slow_init(struct ucc_slow_info * us_info, struct ucc_slow_private ** ucc
 	uccs->rx_base_offset =
 		qe_muram_alloc(us_info->rx_bd_ring_len * sizeof(struct qe_bd),
 				QE_ALIGNMENT_OF_BD);
-	if (IS_MURAM_ERR(uccs->rx_base_offset)) {
+	if (IS_ERR_VALUE(uccs->rx_base_offset)) {
 		printk(KERN_ERR "%s: cannot allocate RX BDs", __FUNCTION__);
 		uccs->rx_base_offset = 0;
 		ucc_slow_free(uccs);
@@ -220,7 +221,7 @@ int ucc_slow_init(struct ucc_slow_info * us_info, struct ucc_slow_private ** ucc
 	uccs->tx_base_offset =
 		qe_muram_alloc(us_info->tx_bd_ring_len * sizeof(struct qe_bd),
 			QE_ALIGNMENT_OF_BD);
-	if (IS_MURAM_ERR(uccs->tx_base_offset)) {
+	if (IS_ERR_VALUE(uccs->tx_base_offset)) {
 		printk(KERN_ERR "%s: cannot allocate TX BDs", __FUNCTION__);
 		uccs->tx_base_offset = 0;
 		ucc_slow_free(uccs);
diff --git a/arch/ppc/8xx_io/commproc.c b/arch/ppc/8xx_io/commproc.c
index 7a8722b..e2c6210 100644
--- a/arch/ppc/8xx_io/commproc.c
+++ b/arch/ppc/8xx_io/commproc.c
@@ -402,7 +402,7 @@ void m8xx_cpm_dpinit(void)
 	 * with the processor and the microcode patches applied / activated.
 	 * But the following should be at least safe.
 	 */
-	rh_attach_region(&cpm_dpmem_info, (void *)CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE);
+	rh_attach_region(&cpm_dpmem_info, CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE);
 }
 
 /*
@@ -410,9 +410,9 @@ void m8xx_cpm_dpinit(void)
  * This function returns an offset into the DPRAM area.
  * Use cpm_dpram_addr() to get the virtual address of the area.
  */
-uint cpm_dpalloc(uint size, uint align)
+unsigned long cpm_dpalloc(uint size, uint align)
 {
-	void *start;
+	unsigned long start;
 	unsigned long flags;
 
 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
@@ -420,34 +420,34 @@ uint cpm_dpalloc(uint size, uint align)
 	start = rh_alloc(&cpm_dpmem_info, size, "commproc");
 	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 
-	return (uint)start;
+	return start;
 }
 EXPORT_SYMBOL(cpm_dpalloc);
 
-int cpm_dpfree(uint offset)
+int cpm_dpfree(unsigned long offset)
 {
 	int ret;
 	unsigned long flags;
 
 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
-	ret = rh_free(&cpm_dpmem_info, (void *)offset);
+	ret = rh_free(&cpm_dpmem_info, offset);
 	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 
 	return ret;
 }
 EXPORT_SYMBOL(cpm_dpfree);
 
-uint cpm_dpalloc_fixed(uint offset, uint size, uint align)
+unsigned long cpm_dpalloc_fixed(unsigned long offset, uint size, uint align)
 {
-	void *start;
+	unsigned long start;
 	unsigned long flags;
 
 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
 	cpm_dpmem_info.alignment = align;
-	start = rh_alloc_fixed(&cpm_dpmem_info, (void *)offset, size, "commproc");
+	start = rh_alloc_fixed(&cpm_dpmem_info, offset, size, "commproc");
 	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 
-	return (uint)start;
+	return start;
 }
 EXPORT_SYMBOL(cpm_dpalloc_fixed);
 
@@ -457,7 +457,7 @@ void cpm_dpdump(void)
 }
 EXPORT_SYMBOL(cpm_dpdump);
 
-void *cpm_dpram_addr(uint offset)
+void *cpm_dpram_addr(unsigned long offset)
 {
 	return ((immap_t *)IMAP_ADDR)->im_cpm.cp_dpmem + offset;
 }
diff --git a/arch/ppc/lib/rheap.c b/arch/ppc/lib/rheap.c
index d407007..9dc2f34 100644
--- a/arch/ppc/lib/rheap.c
+++ b/arch/ppc/lib/rheap.c
@@ -132,7 +132,7 @@ static rh_block_t *get_slot(rh_info_t * info)
 	info->empty_slots--;
 
 	/* Initialize */
-	blk->start = NULL;
+	blk->start = 0;
 	blk->size = 0;
 	blk->owner = NULL;
 
@@ -157,7 +157,7 @@ static void attach_free_block(rh_info_t * info, rh_block_t * blkn)
 
 	/* We assume that they are aligned properly */
 	size = blkn->size;
-	s = (unsigned long)blkn->start;
+	s = blkn->start;
 	e = s + size;
 
 	/* Find the blocks immediately before and after the given one
@@ -169,7 +169,7 @@ static void attach_free_block(rh_info_t * info, rh_block_t * blkn)
 	list_for_each(l, &info->free_list) {
 		blk = list_entry(l, rh_block_t, list);
 
-		bs = (unsigned long)blk->start;
+		bs = blk->start;
 		be = bs + blk->size;
 
 		if (next == NULL && s >= bs)
@@ -187,10 +187,10 @@ static void attach_free_block(rh_info_t * info, rh_block_t * blkn)
 	}
 
 	/* Now check if they are really adjacent */
-	if (before != NULL && s != (unsigned long)before->start + before->size)
+	if (before && s != (before->start + before->size))
 		before = NULL;
 
-	if (after != NULL && e != (unsigned long)after->start)
+	if (after && e != after->start)
 		after = NULL;
 
 	/* No coalescing; list insert and return */
@@ -215,7 +215,7 @@ static void attach_free_block(rh_info_t * info, rh_block_t * blkn)
 
 	/* Grow the after block backwards */
 	if (before == NULL && after != NULL) {
-		after->start = (int8_t *)after->start - size;
+		after->start -= size;
 		after->size += size;
 		return;
 	}
@@ -320,14 +320,14 @@ void rh_init(rh_info_t * info, unsigned int alignment, int max_blocks,
 }
 
 /* Attach a free memory region, coalesces regions if adjuscent */
-int rh_attach_region(rh_info_t * info, void *start, int size)
+int rh_attach_region(rh_info_t * info, unsigned long start, int size)
 {
 	rh_block_t *blk;
 	unsigned long s, e, m;
 	int r;
 
 	/* The region must be aligned */
-	s = (unsigned long)start;
+	s = start;
 	e = s + size;
 	m = info->alignment - 1;
 
@@ -337,9 +337,12 @@ int rh_attach_region(rh_info_t * info, void *start, int size)
 	/* Round end down */
 	e = e & ~m;
 
+	if (IS_ERR_VALUE(e) || (e < s))
+		return -ERANGE;
+
 	/* Take final values */
-	start = (void *)s;
-	size = (int)(e - s);
+	start = s;
+	size = e - s;
 
 	/* Grow the blocks, if needed */
 	r = assure_empty(info, 1);
@@ -357,7 +360,7 @@ int rh_attach_region(rh_info_t * info, void *start, int size)
 }
 
 /* Detatch given address range, splits free block if needed. */
-void *rh_detach_region(rh_info_t * info, void *start, int size)
+unsigned long rh_detach_region(rh_info_t * info, unsigned long start, int size)
 {
 	struct list_head *l;
 	rh_block_t *blk, *newblk;
@@ -365,10 +368,10 @@ void *rh_detach_region(rh_info_t * info, void *start, int size)
 
 	/* Validate size */
 	if (size <= 0)
-		return ERR_PTR(-EINVAL);
+		return (unsigned long) -EINVAL;
 
 	/* The region must be aligned */
-	s = (unsigned long)start;
+	s = start;
 	e = s + size;
 	m = info->alignment - 1;
 
@@ -379,34 +382,34 @@ void *rh_detach_region(rh_info_t * info, void *start, int size)
 	e = e & ~m;
 
 	if (assure_empty(info, 1) < 0)
-		return ERR_PTR(-ENOMEM);
+		return (unsigned long) -ENOMEM;
 
 	blk = NULL;
 	list_for_each(l, &info->free_list) {
 		blk = list_entry(l, rh_block_t, list);
 		/* The range must lie entirely inside one free block */
-		bs = (unsigned long)blk->start;
-		be = (unsigned long)blk->start + blk->size;
+		bs = blk->start;
+		be = blk->start + blk->size;
 		if (s >= bs && e <= be)
 			break;
 		blk = NULL;
 	}
 
 	if (blk == NULL)
-		return ERR_PTR(-ENOMEM);
+		return (unsigned long) -ENOMEM;
 
 	/* Perfect fit */
 	if (bs == s && be == e) {
 		/* Delete from free list, release slot */
 		list_del(&blk->list);
 		release_slot(info, blk);
-		return (void *)s;
+		return s;
 	}
 
 	/* blk still in free list, with updated start and/or size */
 	if (bs == s || be == e) {
 		if (bs == s)
-			blk->start = (int8_t *)blk->start + size;
+			blk->start += size;
 		blk->size -= size;
 
 	} else {
@@ -415,31 +418,31 @@ void *rh_detach_region(rh_info_t * info, void *start, int size)
 
 		/* the back free fragment */
 		newblk = get_slot(info);
-		newblk->start = (void *)e;
+		newblk->start = e;
 		newblk->size = be - e;
 
 		list_add(&newblk->list, &blk->list);
 	}
 
-	return (void *)s;
+	return s;
 }
 
-void *rh_alloc(rh_info_t * info, int size, const char *owner)
+unsigned long rh_alloc(rh_info_t * info, int size, const char *owner)
 {
 	struct list_head *l;
 	rh_block_t *blk;
 	rh_block_t *newblk;
-	void *start;
+	unsigned long start;
 
 	/* Validate size */
 	if (size <= 0)
-		return ERR_PTR(-EINVAL);
+		return (unsigned long) -EINVAL;
 
 	/* Align to configured alignment */
 	size = (size + (info->alignment - 1)) & ~(info->alignment - 1);
 
 	if (assure_empty(info, 1) < 0)
-		return ERR_PTR(-ENOMEM);
+		return (unsigned long) -ENOMEM;
 
 	blk = NULL;
 	list_for_each(l, &info->free_list) {
@@ -450,7 +453,7 @@ void *rh_alloc(rh_info_t * info, int size, const char *owner)
 	}
 
 	if (blk == NULL)
-		return ERR_PTR(-ENOMEM);
+		return (unsigned long) -ENOMEM;
 
 	/* Just fits */
 	if (blk->size == size) {
@@ -470,7 +473,7 @@ void *rh_alloc(rh_info_t * info, int size, const char *owner)
 	newblk->owner = owner;
 
 	/* blk still in free list, with updated start, size */
-	blk->start = (int8_t *)blk->start + size;
+	blk->start += size;
 	blk->size -= size;
 
 	start = newblk->start;
@@ -481,18 +484,18 @@ void *rh_alloc(rh_info_t * info, int size, const char *owner)
 }
 
 /* allocate at precisely the given address */
-void *rh_alloc_fixed(rh_info_t * info, void *start, int size, const char *owner)
+unsigned long rh_alloc_fixed(rh_info_t * info, unsigned long start, int size, const char *owner)
 {
 	struct list_head *l;
 	rh_block_t *blk, *newblk1, *newblk2;
-	unsigned long s, e, m, bs, be;
+	unsigned long s, e, m, bs=0, be=0;
 
 	/* Validate size */
 	if (size <= 0)
-		return ERR_PTR(-EINVAL);
+		return (unsigned long) -EINVAL;
 
 	/* The region must be aligned */
-	s = (unsigned long)start;
+	s = start;
 	e = s + size;
 	m = info->alignment - 1;
 
@@ -503,20 +506,20 @@ void *rh_alloc_fixed(rh_info_t * info, void *start, int size, const char *owner)
 	e = e & ~m;
 
 	if (assure_empty(info, 2) < 0)
-		return ERR_PTR(-ENOMEM);
+		return (unsigned long) -ENOMEM;
 
 	blk = NULL;
 	list_for_each(l, &info->free_list) {
 		blk = list_entry(l, rh_block_t, list);
 		/* The range must lie entirely inside one free block */
-		bs = (unsigned long)blk->start;
-		be = (unsigned long)blk->start + blk->size;
+		bs = blk->start;
+		be = blk->start + blk->size;
 		if (s >= bs && e <= be)
 			break;
 	}
 
 	if (blk == NULL)
-		return ERR_PTR(-ENOMEM);
+		return (unsigned long) -ENOMEM;
 
 	/* Perfect fit */
 	if (bs == s && be == e) {
@@ -534,7 +537,7 @@ void *rh_alloc_fixed(rh_info_t * info, void *start, int size, const char *owner)
 	/* blk still in free list, with updated start and/or size */
 	if (bs == s || be == e) {
 		if (bs == s)
-			blk->start = (int8_t *)blk->start + size;
+			blk->start += size;
 		blk->size -= size;
 
 	} else {
@@ -543,14 +546,14 @@ void *rh_alloc_fixed(rh_info_t * info, void *start, int size, const char *owner)
 
 		/* The back free fragment */
 		newblk2 = get_slot(info);
-		newblk2->start = (void *)e;
+		newblk2->start = e;
 		newblk2->size = be - e;
 
 		list_add(&newblk2->list, &blk->list);
 	}
 
 	newblk1 = get_slot(info);
-	newblk1->start = (void *)s;
+	newblk1->start = s;
 	newblk1->size = e - s;
 	newblk1->owner = owner;
 
@@ -560,7 +563,7 @@ void *rh_alloc_fixed(rh_info_t * info, void *start, int size, const char *owner)
 	return start;
 }
 
-int rh_free(rh_info_t * info, void *start)
+int rh_free(rh_info_t * info, unsigned long start)
 {
 	rh_block_t *blk, *blk2;
 	struct list_head *l;
@@ -625,7 +628,7 @@ int rh_get_stats(rh_info_t * info, int what, int max_stats, rh_stats_t * stats)
 	return nr;
 }
 
-int rh_set_owner(rh_info_t * info, void *start, const char *owner)
+int rh_set_owner(rh_info_t * info, unsigned long start, const char *owner)
 {
 	rh_block_t *blk, *blk2;
 	struct list_head *l;
@@ -667,8 +670,8 @@ void rh_dump(rh_info_t * info)
 		nr = maxnr;
 	for (i = 0; i < nr; i++)
 		printk(KERN_INFO
-		       "    0x%p-0x%p (%u)\n",
-		       st[i].start, (int8_t *) st[i].start + st[i].size,
+		       "    0x%lx-0x%lx (%u)\n",
+		       st[i].start, st[i].start + st[i].size,
 		       st[i].size);
 	printk(KERN_INFO "\n");
 
@@ -678,8 +681,8 @@ void rh_dump(rh_info_t * info)
 		nr = maxnr;
 	for (i = 0; i < nr; i++)
 		printk(KERN_INFO
-		       "    0x%p-0x%p (%u) %s\n",
-		       st[i].start, (int8_t *) st[i].start + st[i].size,
+		       "    0x%lx-0x%lx (%u) %s\n",
+		       st[i].start, st[i].start + st[i].size,
 		       st[i].size, st[i].owner != NULL ? st[i].owner : "");
 	printk(KERN_INFO "\n");
 }
@@ -687,6 +690,6 @@ void rh_dump(rh_info_t * info)
 void rh_dump_blk(rh_info_t * info, rh_block_t * blk)
 {
 	printk(KERN_INFO
-	       "blk @0x%p: 0x%p-0x%p (%u)\n",
-	       blk, blk->start, (int8_t *) blk->start + blk->size, blk->size);
+	       "blk @0x%p: 0x%lx-0x%lx (%u)\n",
+	       blk, blk->start, blk->start + blk->size, blk->size);
 }
diff --git a/arch/ppc/syslib/cpm2_common.c b/arch/ppc/syslib/cpm2_common.c
index cbac44b..6cd859d 100644
--- a/arch/ppc/syslib/cpm2_common.c
+++ b/arch/ppc/syslib/cpm2_common.c
@@ -136,15 +136,14 @@ static void cpm2_dpinit(void)
 	 * varies with the processor and the microcode patches activated.
 	 * But the following should be at least safe.
 	 */
-	rh_attach_region(&cpm_dpmem_info, (void *)CPM_DATAONLY_BASE,
-			CPM_DATAONLY_SIZE);
+	rh_attach_region(&cpm_dpmem_info, CPM_DATAONLY_BASE, CPM_DATAONLY_SIZE);
 }
 
 /* This function returns an index into the DPRAM area.
  */
-uint cpm_dpalloc(uint size, uint align)
+unsigned long cpm_dpalloc(uint size, uint align)
 {
-	void *start;
+	unsigned long start;
 	unsigned long flags;
 
 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
@@ -152,17 +151,17 @@ uint cpm_dpalloc(uint size, uint align)
 	start = rh_alloc(&cpm_dpmem_info, size, "commproc");
 	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 
-	return (uint)start;
+	return start;
 }
 EXPORT_SYMBOL(cpm_dpalloc);
 
-int cpm_dpfree(uint offset)
+int cpm_dpfree(unsigned long offset)
 {
 	int ret;
 	unsigned long flags;
 
 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
-	ret = rh_free(&cpm_dpmem_info, (void *)offset);
+	ret = rh_free(&cpm_dpmem_info, offset);
 	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 
 	return ret;
@@ -170,17 +169,17 @@ int cpm_dpfree(uint offset)
 EXPORT_SYMBOL(cpm_dpfree);
 
 /* not sure if this is ever needed */
-uint cpm_dpalloc_fixed(uint offset, uint size, uint align)
+unsigned long cpm_dpalloc_fixed(unsigned long offset, uint size, uint align)
 {
-	void *start;
+	unsigned long start;
 	unsigned long flags;
 
 	spin_lock_irqsave(&cpm_dpmem_lock, flags);
 	cpm_dpmem_info.alignment = align;
-	start = rh_alloc_fixed(&cpm_dpmem_info, (void *)offset, size, "commproc");
+	start = rh_alloc_fixed(&cpm_dpmem_info, offset, size, "commproc");
 	spin_unlock_irqrestore(&cpm_dpmem_lock, flags);
 
-	return (uint)start;
+	return start;
 }
 EXPORT_SYMBOL(cpm_dpalloc_fixed);
 
@@ -190,7 +189,7 @@ void cpm_dpdump(void)
 }
 EXPORT_SYMBOL(cpm_dpdump);
 
-void *cpm_dpram_addr(uint offset)
+void *cpm_dpram_addr(unsigned long offset)
 {
 	return (void *)&cpm2_immr->im_dprambase[offset];
 }