[PATCH] x86-64: Fix vmalloc_32 to really allocate <4GB on 64bit platforms

Ugly ifdef, but should handle all 64bit platforms that have suitable
zones. On some like Altix it's probably impossible without IOMMU
use to get memory <4GB this way,  but they have to live with that.
Signed-off-by: Andi Kleen <ak@suse.de>

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 9eef486..cb5aabd 100644 (file)
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -431,7 +431,7 @@ void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
                area->flags |= VM_VPAGES;
        } else {
                pages = kmalloc_node(array_size,
-                               (gfp_mask & ~(__GFP_HIGHMEM | __GFP_ZERO)),
+                               (gfp_mask & GFP_LEVEL_MASK),
                                node);
        }
        area->pages = pages;
@@ -577,6 +577,14 @@ void *vmalloc_exec(unsigned long size)
        return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC);
 }
 
+#if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32)
+#define GFP_VMALLOC32 GFP_DMA32
+#elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA)
+#define GFP_VMALLOC32 GFP_DMA
+#else
+#define GFP_VMALLOC32 GFP_KERNEL
+#endif
+
 /**
  *     vmalloc_32  -  allocate virtually contiguous memory (32bit addressable)
  *     @size:          allocation size
@@ -586,7 +594,7 @@ void *vmalloc_exec(unsigned long size)
  */
 void *vmalloc_32(unsigned long size)
 {
-       return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL);
+       return __vmalloc(size, GFP_VMALLOC32, PAGE_KERNEL);
 }
 EXPORT_SYMBOL(vmalloc_32);
 
@@ -602,7 +610,7 @@ void *vmalloc_32_user(unsigned long size)
        struct vm_struct *area;
        void *ret;
 
-       ret = __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);
+       ret = __vmalloc(size, GFP_VMALLOC32 | __GFP_ZERO, PAGE_KERNEL);
        if (ret) {
                write_lock(&vmlist_lock);
                area = __find_vm_area(ret);