powerpc: Cleanup memblock usage

* early_init_devtree(): Total memory size is aligned to PAGE_SIZE;
  however, alignment isn't enforced if memory_limit is explicitly
  specified.  Simplify the logic and always apply PAGE_SIZE alignment.

* MMU_init(): memblock regions is truncated by directly modifying
  memblock.memory.cnt.  This is incomplete (reserved array is not
  truncated) and unnecessarily low level hindering further memblock
  improvments.  Use memblock_enforce_memory_limit() instead.

* wii_memory_fixups(): Unnecessarily low level direct manipulation of
  memblock regions.  The same result can be achieved using properly
  abstracted operations.  Reimplement using memblock API.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Yinghai Lu <yinghai@kernel.org>

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index a7ee83e..28500d4 100644 (file)
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -754,17 +754,12 @@ void __init early_init_devtree(void *params)
        early_reserve_mem();
        phyp_dump_reserve_mem();
 
-       limit = memory_limit;
-       if (! limit) {
-               phys_addr_t memsize;
-
-               /* Ensure that total memory size is page-aligned, because
-                * otherwise mark_bootmem() gets upset. */
-               memblock_analyze();
-               memsize = memblock_phys_mem_size();
-               if ((memsize & PAGE_MASK) != memsize)
-                       limit = memsize & PAGE_MASK;
-       }
+       /*
+        * Ensure that total memory size is page-aligned, because otherwise
+        * mark_bootmem() gets upset.
+        */
+       memblock_analyze();
+       limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
        memblock_enforce_memory_limit(limit);
 
        memblock_analyze();

diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index 161cefd..12bb528 100644 (file)
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -134,7 +134,7 @@ void __init MMU_init(void)
 
        if (memblock.memory.cnt > 1) {
 #ifndef CONFIG_WII
-               memblock.memory.cnt = 1;
+               memblock_enforce_memory_limit(memblock.memory.regions[0].size);
                memblock_analyze();
                printk(KERN_WARNING "Only using first contiguous memory region");
 #else

diff --git a/arch/powerpc/platforms/embedded6xx/wii.c b/arch/powerpc/platforms/embedded6xx/wii.c
index 1b5dc1a..1cbe9d3 100644 (file)
--- a/arch/powerpc/platforms/embedded6xx/wii.c
+++ b/arch/powerpc/platforms/embedded6xx/wii.c
@@ -79,23 +79,19 @@ void __init wii_memory_fixups(void)
        BUG_ON(memblock.memory.cnt != 2);
        BUG_ON(!page_aligned(p[0].base) || !page_aligned(p[1].base));
 
-       p[0].size = _ALIGN_DOWN(p[0].size, PAGE_SIZE);
-       p[1].size = _ALIGN_DOWN(p[1].size, PAGE_SIZE);
+       /* trim unaligned tail */
+       memblock_remove(ALIGN(p[1].base + p[1].size, PAGE_SIZE),
+                       (phys_addr_t)ULLONG_MAX);
 
-       wii_hole_start = p[0].base + p[0].size;
+       /* determine hole, add & reserve them */
+       wii_hole_start = ALIGN(p[0].base + p[0].size, PAGE_SIZE);
        wii_hole_size = p[1].base - wii_hole_start;
-
-       pr_info("MEM1: <%08llx %08llx>\n", p[0].base, p[0].size);
-       pr_info("HOLE: <%08lx %08lx>\n", wii_hole_start, wii_hole_size);
-       pr_info("MEM2: <%08llx %08llx>\n", p[1].base, p[1].size);
-
-       p[0].size += wii_hole_size + p[1].size;
-
-       memblock.memory.cnt = 1;
+       memblock_add(wii_hole_start, wii_hole_size);
+       memblock_reserve(wii_hole_start, wii_hole_size);
        memblock_analyze();
 
-       /* reserve the hole */
-       memblock_reserve(wii_hole_start, wii_hole_size);
+       BUG_ON(memblock.memory.cnt != 1);
+       __memblock_dump_all();
 
        /* allow ioremapping the address space in the hole */
        __allow_ioremap_reserved = 1;