powerpc/mm: Make careful_allocation() return virtual addrs

Since we memset() the result in both of the uses here,
just make careful_alloc() return a virtual address.
Also, add a separate variable to store the physial
address that comes back from the lmb_alloc() functions.
This makes it less likely that someone will screw it up
forgetting to convert before returning since the vaddr
is always in a void* and the paddr is always in an
unsigned long.

I admit this is arbitrary since one of its users needs
a paddr and one a vaddr, but it does remove a good
number of casts.

Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 20 insertions, 17 deletions

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index aabf30175eb5..9ec9939f9fb0 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -822,23 +822,28 @@ static void __init dump_numa_memory_topology(void)
  * required. nid is the preferred node and end is the physical address of
  * the highest address in the node.
  *
- * Returns the physical address of the memory.
+ * Returns the virtual address of the memory.
  */
 static void __init *careful_allocation(int nid, unsigned long size,
                                        unsigned long align,
                                        unsigned long end_pfn)
 {
+        void *ret;
         int new_nid;
-        unsigned long ret = __lmb_alloc_base(size, align, end_pfn << PAGE_SHIFT);
+        unsigned long ret_paddr;
+
+        ret_paddr = __lmb_alloc_base(size, align, end_pfn << PAGE_SHIFT);
 
         /* retry over all memory */
-        if (!ret)
-                ret = __lmb_alloc_base(size, align, lmb_end_of_DRAM());
+        if (!ret_paddr)
+                ret_paddr = __lmb_alloc_base(size, align, lmb_end_of_DRAM());
 
-        if (!ret)
+        if (!ret_paddr)
                 panic("numa.c: cannot allocate %lu bytes for node %d",
                       size, nid);
 
+        ret = __va(ret_paddr);
+
         /*
          * We initialize the nodes in numeric order: 0, 1, 2...
          * and hand over control from the LMB allocator to the
@@ -851,17 +856,15 @@ static void __init *careful_allocation(int nid, unsigned long size,
          * instead of the LMB.  We don't free the LMB memory
          * since it would be useless.
          */
-        new_nid = early_pfn_to_nid(ret >> PAGE_SHIFT);
+        new_nid = early_pfn_to_nid(ret_paddr >> PAGE_SHIFT);
         if (new_nid < nid) {
-                ret = (unsigned long)__alloc_bootmem_node(NODE_DATA(new_nid),
+                ret = __alloc_bootmem_node(NODE_DATA(new_nid),
                                 size, align, 0);
 
-                ret = __pa(ret);
-
-                dbg("alloc_bootmem %lx %lx\n", ret, size);
+                dbg("alloc_bootmem %p %lx\n", ret, size);
         }
 
-        return (void *)ret;
+        return ret;
 }
 
 static struct notifier_block __cpuinitdata ppc64_numa_nb = {
@@ -956,7 +959,7 @@ void __init do_init_bootmem(void)
 
         for_each_online_node(nid) {
                 unsigned long start_pfn, end_pfn;
-                unsigned long bootmem_paddr;
+                void *bootmem_vaddr;
                 unsigned long bootmap_pages;
 
                 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
@@ -971,7 +974,6 @@ void __init do_init_bootmem(void)
                 NODE_DATA(nid) = careful_allocation(nid,
                                         sizeof(struct pglist_data),
                                         SMP_CACHE_BYTES, end_pfn);
-                NODE_DATA(nid) = __va(NODE_DATA(nid));
                 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 
                 dbg("node %d\n", nid);
@@ -988,14 +990,15 @@ void __init do_init_bootmem(void)
                 dbg("end_paddr = %lx\n", end_pfn << PAGE_SHIFT);
 
                 bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
-                bootmem_paddr = (unsigned long)careful_allocation(nid,
+                bootmem_vaddr = careful_allocation(nid,
                                         bootmap_pages << PAGE_SHIFT,
                                         PAGE_SIZE, end_pfn);
-                memset(__va(bootmem_paddr), 0, bootmap_pages << PAGE_SHIFT);
+                memset(bootmem_vaddr, 0, bootmap_pages << PAGE_SHIFT);
 
-                dbg("bootmap_paddr = %lx\n", bootmem_paddr);
+                dbg("bootmap_vaddr = %p\n", bootmem_vaddr);
 
-                init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
+                init_bootmem_node(NODE_DATA(nid),
+                                  __pa(bootmem_vaddr) >> PAGE_SHIFT,
                                   start_pfn, end_pfn);
 
                 free_bootmem_with_active_regions(nid, end_pfn);