[RFC PATCHv2 4/4] mm/vmalloc.c: Treat the entire kernel virtual space as vmalloc

[Laura Abbott <lauraa@codeaurora.org>]

With CONFIG_ENABLE_VMALLOC_SAVINGS, all lowmem is tracked in
vmalloc. This means that all the kernel virtual address space
can be treated as part of the vmalloc region. Allow vm areas
to be allocated from the full kernel address range.

Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Neeti Desai <neetid@codeaurora.org>
---
 mm/vmalloc.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 2ec9ac7..31644b6 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1394,16 +1394,27 @@ struct vm_struct *__get_vm_area_caller(unsigned long size, unsigned long flags,
  */
 struct vm_struct *get_vm_area(unsigned long size, unsigned long flags)
 {
+#ifdef CONFIG_ENABLE_VMALLOC_SAVING
+	return __get_vm_area_node(size, 1, flags, PAGE_OFFSET, VMALLOC_END,
+				  NUMA_NO_NODE, GFP_KERNEL,
+				  __builtin_return_address(0));
+#else
 	return __get_vm_area_node(size, 1, flags, VMALLOC_START, VMALLOC_END,
 				  NUMA_NO_NODE, GFP_KERNEL,
 				  __builtin_return_address(0));
+#endif
 }
 
 struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags,
 				const void *caller)
 {
+#ifdef CONFIG_ENABLE_VMALLOC_SAVING
+	return __get_vm_area_node(size, 1, flags, PAGE_OFFSET, VMALLOC_END,
+				  NUMA_NO_NODE, GFP_KERNEL, caller);
+#else
 	return __get_vm_area_node(size, 1, flags, VMALLOC_START, VMALLOC_END,
 				  NUMA_NO_NODE, GFP_KERNEL, caller);
+#endif
 }
 
 /**
-- 
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