2 files changed, 17 insertions, 4 deletions

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 8dbffb846de9..87d4d6964ec2 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -123,6 +123,14 @@ void __init pci_iommu_alloc(void)
 
         pci_swiotlb_init();
 }
+
+unsigned long iommu_num_pages(unsigned long addr, unsigned long len)
+{
+        unsigned long size = roundup((addr & ~PAGE_MASK) + len, PAGE_SIZE);
+
+        return size >> PAGE_SHIFT;
+}
+EXPORT_SYMBOL(iommu_num_pages);
 #endif
 
 /*
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index b520dae02bf4..2d888586385d 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -788,10 +788,6 @@ void __init setup_arch(char **cmdline_p)
 
         initmem_init(0, max_pfn);
 
-#ifdef CONFIG_X86_64
-        dma32_reserve_bootmem();
-#endif
-
 #ifdef CONFIG_ACPI_SLEEP
         /*
          * Reserve low memory region for sleep support.
@@ -806,6 +802,15 @@ void __init setup_arch(char **cmdline_p)
 #endif
         reserve_crashkernel();
 
+#ifdef CONFIG_X86_64
+        /*
+         * dma32_reserve_bootmem() allocates bootmem which may conflict
+         * with the crashkernel command line, so do that after
+         * reserve_crashkernel()
+         */
+        dma32_reserve_bootmem();
+#endif
+
         reserve_ibft_region();
 
 #ifdef CONFIG_KVM_CLOCK