[PATCH] ARM: use memblock memory regions for "System RAM" I/O resources

[Dima Zavin]

Do not use memory bank info to request the "system ram" resources as
they do not track holes created by memblock_remove inside
machine's reserve callback. If the removed memory is passed as
platform_device's ioresource, then drivers that call
request_mem_region would fail due to a conflict with the incorrectly
configured system ram resource.

Instead, iterate through the regions of memblock.memory and add
those as "System RAM" resources.

Signed-off-by: Dima Zavin <dima at android.com>
---
 arch/arm/kernel/setup.c |   16 ++++++----------
 1 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 336f14e..470efbc 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -517,25 +517,21 @@ setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
 #endif
 }
 
-static void __init
-request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
+static void __init request_standard_resources(struct machine_desc *mdesc)
 {
+	struct memblock_region *region;
 	struct resource *res;
-	int i;
 
 	kernel_code.start   = virt_to_phys(_text);
 	kernel_code.end     = virt_to_phys(_etext - 1);
 	kernel_data.start   = virt_to_phys(_sdata);
 	kernel_data.end     = virt_to_phys(_end - 1);
 
-	for (i = 0; i < mi->nr_banks; i++) {
-		if (mi->bank[i].size == 0)
-			continue;
-
+	for_each_memblock(memory, region) {
 		res = alloc_bootmem_low(sizeof(*res));
 		res->name  = "System RAM";
-		res->start = mi->bank[i].start;
-		res->end   = mi->bank[i].start + mi->bank[i].size - 1;
+		res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
+		res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
 		res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 
 		request_resource(&iomem_resource, res);
@@ -857,7 +853,7 @@ void __init setup_arch(char **cmdline_p)
 	arm_memblock_init(&meminfo, mdesc);
 
 	paging_init(mdesc);
-	request_standard_resources(&meminfo, mdesc);
+	request_standard_resources(mdesc);
 
 #ifdef CONFIG_SMP
 	if (is_smp())
-- 
1.7.3.1