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-rw-r--r--include/linux/vmalloc.h2
-rw-r--r--mm/vmalloc.c4
2 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 227c2a5..b840fda 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -7,6 +7,8 @@
struct vm_area_struct; /* vma defining user mapping in mm_types.h */
+extern bool vmap_lazy_unmap;
+
/* bits in flags of vmalloc's vm_struct below */
#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
#define VM_ALLOC 0x00000002 /* vmalloc() */
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index ae00746..7f35fe2 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -31,6 +31,7 @@
#include <asm/tlbflush.h>
#include <asm/shmparam.h>
+bool vmap_lazy_unmap __read_mostly = true;
/*** Page table manipulation functions ***/
@@ -502,6 +503,9 @@ static unsigned long lazy_max_pages(void)
{
unsigned int log;
+ if (!vmap_lazy_unmap)
+ return 0;
+
log = fls(num_online_cpus());
return log * (32UL * 1024 * 1024 / PAGE_SIZE);
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