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hv_balloon: simplify hv_online_page()/hv_page_online_one() 

Instead of doing pfn_to_page() and continuosly casting page to unsigned
long just cache the pfn of the page with page_to_pfn().

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2018-03-04 22:17:20 -07:00 committed by Greg Kroah-Hartman
parent 223e1e4d2c
commit 4f098af514
1 changed files with 5 additions and 22 deletions
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27
drivers/hv/hv_balloon.c
View File

@ -612,28 +612,17 @@ static struct notifier_block hv_memory_nb = {
/* Check if the particular page is backed and can be onlined and online it. */
static void hv_page_online_one(struct hv_hotadd_state *has, struct page *pg)
{
unsigned long cur_start_pgp;
unsigned long cur_end_pgp;
struct hv_hotadd_gap *gap;
cur_start_pgp = (unsigned long)pfn_to_page(has->covered_start_pfn);
cur_end_pgp = (unsigned long)pfn_to_page(has->covered_end_pfn);
unsigned long pfn = page_to_pfn(pg);
/* The page is not backed. */
if (((unsigned long)pg < cur_start_pgp) ||
((unsigned long)pg >= cur_end_pgp))
if ((pfn < has->covered_start_pfn) || (pfn >= has->covered_end_pfn))
return;
/* Check for gaps. */
list_for_each_entry(gap, &has->gap_list, list) {
cur_start_pgp = (unsigned long)
pfn_to_page(gap->start_pfn);
cur_end_pgp = (unsigned long)
pfn_to_page(gap->end_pfn);
if (((unsigned long)pg >= cur_start_pgp) &&
((unsigned long)pg < cur_end_pgp)) {
if ((pfn >= gap->start_pfn) && (pfn < gap->end_pfn))
return;
}
}
/* This frame is currently backed; online the page. */
@ -726,19 +715,13 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
static void hv_online_page(struct page *pg)
{
struct hv_hotadd_state *has;
unsigned long cur_start_pgp;
unsigned long cur_end_pgp;
unsigned long flags;
unsigned long pfn = page_to_pfn(pg);
spin_lock_irqsave(&dm_device.ha_lock, flags);
list_for_each_entry(has, &dm_device.ha_region_list, list) {
cur_start_pgp = (unsigned long)
pfn_to_page(has->start_pfn);
cur_end_pgp = (unsigned long)pfn_to_page(has->end_pfn);
/* The page belongs to a different HAS. */
if (((unsigned long)pg < cur_start_pgp) ||
((unsigned long)pg >= cur_end_pgp))
if ((pfn < has->start_pfn) || (pfn >= has->end_pfn))
continue;
hv_page_online_one(has, pg);