linux-kernel - [PATCH 11/23] powerpc: Cleanup memblock usage

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Date:	Tue, 26 Jul 2011 17:35:22 +0200
From:	Tejun Heo <tj@...nel.org>
To:	benh@...nel.crashing.org, yinghai@...nel.org, hpa@...or.com,
	tony.luck@...el.com, ralf@...ux-mips.org, schwidefsky@...ibm.com,
	liqin.chen@...plusct.com, lethal@...ux-sh.org, davem@...emloft.net,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Cc:	mingo@...hat.com, Tejun Heo <tj@...nel.org>
Subject: [PATCH 11/23] 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@...nel.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Yinghai Lu <yinghai@...nel.org>
---
 arch/powerpc/kernel/prom.c               |   17 ++++++-----------
 arch/powerpc/mm/init_32.c                |    2 +-
 arch/powerpc/platforms/embedded6xx/wii.c |   22 +++++++++-------------
 3 files changed, 16 insertions(+), 25 deletions(-)

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 83633b9..16a632f 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -736,17 +736,12 @@ 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 5de0f25..d6c2607 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -125,7 +125,7 @@ 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
--- 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;
-- 
1.7.6

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