From a0d40c80256e31b23849f2ba781b74bf0218a1fa Mon Sep 17 00:00:00 2001
From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Date: Fri, 26 Mar 2010 15:28:51 -0700
Subject: 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>
---
 mm/vmalloc.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'mm/vmalloc.c')

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index ae007462b7f..7f35fe2cf9e 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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