linux-kernel - [PATCH v6 1/5] mm/sparse: Add a static variable nr_present

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Message-Id: <20180628062857.29658-2-bhe@redhat.com>
Date:   Thu, 28 Jun 2018 14:28:53 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, pagupta@...hat.com,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Oscar Salvador <osalvador@...hadventures.net>
Cc:     linux-mm@...ck.org, kirill.shutemov@...ux.intel.com,
        Baoquan He <bhe@...hat.com>
Subject: [PATCH v6 1/5] mm/sparse: Add a static variable nr_present_sections

It's used to record how many memory sections are marked as present
during system boot up, and will be used in the later patch.

Signed-off-by: Baoquan He <bhe@...hat.com>
Reviewed-by: Pavel Tatashin <pasha.tatashin@...cle.com>
---
 mm/sparse.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/sparse.c b/mm/sparse.c
index f13f2723950a..6314303130b0 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -200,6 +200,12 @@ static inline int next_present_section_nr(int section_nr)
 	      (section_nr <= __highest_present_section_nr));	\
 	     section_nr = next_present_section_nr(section_nr))
 
+/*
+ * Record how many memory sections are marked as present
+ * during system bootup.
+ */
+static int __initdata nr_present_sections;
+
 /* Record a memory area against a node. */
 void __init memory_present(int nid, unsigned long start, unsigned long end)
 {
@@ -229,6 +235,7 @@ void __init memory_present(int nid, unsigned long start, unsigned long end)
 			ms->section_mem_map = sparse_encode_early_nid(nid) |
 							SECTION_IS_ONLINE;
 			section_mark_present(ms);
+			nr_present_sections++;
 		}
 	}
 }
-- 
2.13.6