[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>

1 files changed, 10 insertions, 11 deletions

diff --git a/arch/powerpc/sysdev/cpm2_common.c b/arch/powerpc/sysdev/cpm2_common.c
index ec265995d5d8..924412974795 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);
 }