xen/balloon: Use PageHighMem() for high memory page detection

Replace pfn < max_low_pfn by !PageHighMem() in increase_reservation().
It makes more clearer what is going on.

Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: Daniel Kiper <dkiper@net-space.pl>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 043af8a..61665b2 100644 (file)
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -246,7 +246,7 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
                set_phys_to_machine(pfn, frame_list[i]);
 
                /* Link back into the page tables if not highmem. */
-               if (!xen_hvm_domain() && pfn < max_low_pfn) {
+               if (!xen_hvm_domain() && !PageHighMem(page)) {
                        int ret;
                        ret = HYPERVISOR_update_va_mapping(
                                (unsigned long)__va(pfn << PAGE_SHIFT),