Commit a0d40c80 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Konrad Rzeszutek Wilk
Browse files

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: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: default avatarNick Piggin <npiggin@suse.de>
parent 08bbc9da

include/linux/vmalloc.h

+2 −0
Original line number Diff line number Diff line
@@ -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() */

mm/vmalloc.c

+4 −0
Original line number Diff line number Diff line
@@ -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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