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From: kys@exchange.microsoft.com
To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
	devel@linuxdriverproject.org, olaf@aepfle.de, apw@canonical.com,
	vkuznets@redhat.com, jasowang@redhat.com,
	leann.ogasawara@canonical.com, marcelo.cerri@canonical.com,
	sthemmin@microsoft.com
Subject: [PATCH V2 10/12] hv_balloon: simplify hv_online_page()/hv_page_online_one()
Date: Sun,  4 Mar 2018 22:17:20 -0700	[thread overview]
Message-ID: <20180305051722.19157-10-kys@exchange.microsoft.com> (raw)
In-Reply-To: <20180305051722.19157-1-kys@exchange.microsoft.com>

From: Vitaly Kuznetsov <vkuznets@redhat.com>

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>
---
 drivers/hv/hv_balloon.c | 27 +++++----------------------
 1 file changed, 5 insertions(+), 22 deletions(-)

diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 1aece72da9ba..5b8e1ad1bcfe 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -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);
-- 
2.15.1

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  parent reply	other threads:[~2018-03-05  5:17 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-05  5:15 [PATCH V2 00/12] Drivers: hv: Miscellaneous fixes kys
2018-03-05  5:17 ` [PATCH V2 01/12] tools/hv: Fix IP reporting by KVP daemon with SRIOV kys
2018-03-05  5:17   ` [PATCH V2 02/12] hyper-v: use GFP_KERNEL for hv_context.hv_numa_map kys
2018-03-05  5:17   ` [PATCH V2 03/12] hv: Synthetic typo correction kys
2018-03-05  5:17   ` [PATCH V2 04/12] tools: hv: fix compiler warnings about major/target_fname kys
2018-03-05  5:17   ` [PATCH V2 05/12] tools: hv: include string.h in hv_fcopy_daemon kys
2018-03-05  5:17   ` [PATCH V2 06/12] vmbus/ring_buffer: remove some redundant helper function kys
2018-03-06 17:56     ` Greg KH
2018-03-05  5:17   ` [PATCH V2 07/12] hv_vmbus: Correct the stale comments regarding cpu affinity kys
2018-03-05  5:17   ` [PATCH V2 08/12] Drivers: hv: vmbus: Implement Direct Mode for stimer0 kys
2018-03-05  5:17   ` [PATCH V2 09/12] hv_balloon: fix printk loglevel kys
2018-03-05  5:17   ` kys [this message]
2018-03-05  5:17   ` [PATCH V2 11/12] hv_balloon: fix bugs in num_pages_onlined accounting kys
2018-03-05  5:17   ` [PATCH V2 12/12] hv_balloon: trace post_status kys

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