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-rw-r--r--arch/arm/mm/init.c23
1 files changed, 18 insertions, 5 deletions
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 15739a95552a..d1e26610977d 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -231,6 +231,9 @@ phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
static void __init arm_initrd_init(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
+ phys_addr_t start;
+ unsigned long size;
+
/* FDT scan will populate initrd_start */
if (initrd_start && !phys_initrd_size) {
phys_initrd_start = __virt_to_phys(initrd_start);
@@ -242,19 +245,29 @@ static void __init arm_initrd_init(void)
if (!phys_initrd_size)
return;
- if (!memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
+ /*
+ * Round the memory region to page boundaries as per free_initrd_mem()
+ * This allows us to detect whether the pages overlapping the initrd
+ * are in use, but more importantly, reserves the entire set of pages
+ * as we don't want these pages allocated for other purposes.
+ */
+ start = round_down(phys_initrd_start, PAGE_SIZE);
+ size = phys_initrd_size + (phys_initrd_start - start);
+ size = round_up(size, PAGE_SIZE);
+
+ if (!memblock_is_region_memory(start, size)) {
pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n",
- (u64)phys_initrd_start, phys_initrd_size);
+ (u64)start, size);
return;
}
- if (memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
+ if (memblock_is_region_reserved(start, size)) {
pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n",
- (u64)phys_initrd_start, phys_initrd_size);
+ (u64)start, size);
return;
}
- memblock_reserve(phys_initrd_start, phys_initrd_size);
+ memblock_reserve(start, size);
/* Now convert initrd to virtual addresses */
initrd_start = __phys_to_virt(phys_initrd_start);