From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: linux-hyperv@vger.kernel.org
Cc: Wei Liu <wei.liu@kernel.org>,
Stephen Hemminger <sthemmin@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Michael Kelley <mikelley@microsoft.com>,
Dexuan Cui <decui@microsoft.com>,
David Hildenbrand <david@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH 1/2] hv_balloon: simplify math in alloc_balloon_pages()
Date: Wed, 2 Dec 2020 17:12:44 +0100 [thread overview]
Message-ID: <20201202161245.2406143-2-vkuznets@redhat.com> (raw)
In-Reply-To: <20201202161245.2406143-1-vkuznets@redhat.com>
'alloc_unit' in alloc_balloon_pages() is either '512' for 2M allocations or
'1' for 4k allocations. So
1 << get_order(alloc_unit << PAGE_SHIFT)
equals to 'alloc_unit' and the for loop basically sets all them offline.
Simplify the math to improve the readability.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
drivers/hv/hv_balloon.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index eb56e09ae15f..da3b6bd2367c 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -1238,7 +1238,7 @@ static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm,
split_page(pg, get_order(alloc_unit << PAGE_SHIFT));
/* mark all pages offline */
- for (j = 0; j < (1 << get_order(alloc_unit << PAGE_SHIFT)); j++)
+ for (j = 0; j < alloc_unit; j++)
__SetPageOffline(pg + j);
bl_resp->range_count++;
--
2.26.2
next prev parent reply other threads:[~2020-12-02 16:14 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-02 16:12 [PATCH 0/2] hv_balloon: hide ballooned out memory in stats Vitaly Kuznetsov
2020-12-02 16:12 ` Vitaly Kuznetsov [this message]
2020-12-03 16:15 ` [PATCH 1/2] hv_balloon: simplify math in alloc_balloon_pages() David Hildenbrand
2020-12-02 16:12 ` [PATCH 2/2] hv_balloon: do adjust_managed_page_count() when ballooning/un-ballooning Vitaly Kuznetsov
2020-12-03 16:13 ` David Hildenbrand
2020-12-03 17:49 ` Vitaly Kuznetsov
2020-12-03 17:49 ` David Hildenbrand
2020-12-09 13:17 ` [PATCH 0/2] hv_balloon: hide ballooned out memory in stats Wei Liu
2020-12-13 15:07 ` Wei Liu
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