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powerpc: Cleanup memblock usage

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* 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>
This commit is contained in:
Tejun Heo
2011-12-08 10:22:07 -08:00
rodzic c0ce8fef55
commit 6fbef13c4f
3 zmienionych plików z 16 dodań i 25 usunięć
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22
arch/powerpc/platforms/embedded6xx/wii.c
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@@ -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;