vmap: add flag to allow lazy unmap to be disabled at runtime
Add a flag to force lazy_max_pages() to zero to prevent any outstanding
mapped pages. We'll need this for Xen.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Nick Piggin <npiggin@suse.de>
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index ae007462..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 @@
{
unsigned int log;
+ if (!vmap_lazy_unmap)
+ return 0;
+
log = fls(num_online_cpus());
return log * (32UL * 1024 * 1024 / PAGE_SIZE);