From: Baoquan He <bhe@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, akpm@linux-foundation.org, mhocko@suse.com,
david@redhat.com, richard.weiyang@gmail.com,
dan.j.williams@intel.com, bhe@redhat.com
Subject: [PATCH v4 5/5] mm/sparse.c: move subsection_map related functions together
Date: Thu, 12 Mar 2020 20:44:14 +0800 [thread overview]
Message-ID: <20200312124414.439-6-bhe@redhat.com> (raw)
In-Reply-To: <20200312124414.439-1-bhe@redhat.com>
No functional change.
Signed-off-by: Baoquan He <bhe@redhat.com>
---
mm/sparse.c | 132 +++++++++++++++++++++++++---------------------------
1 file changed, 64 insertions(+), 68 deletions(-)
diff --git a/mm/sparse.c b/mm/sparse.c
index f02a524e17d1..bf6c00a28045 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -244,10 +244,74 @@ void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages)
nr_pages -= pfns;
}
}
+
+static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages)
+{
+ DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
+ DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 };
+ struct mem_section *ms = __pfn_to_section(pfn);
+ unsigned long *subsection_map = ms->usage
+ ? &ms->usage->subsection_map[0] : NULL;
+
+ subsection_mask_set(map, pfn, nr_pages);
+ if (subsection_map)
+ bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION);
+
+ if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION),
+ "section already deactivated (%#lx + %ld)\n",
+ pfn, nr_pages))
+ return -EINVAL;
+
+ bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION);
+ return 0;
+}
+
+static bool is_subsection_map_empty(struct mem_section *ms)
+{
+ return bitmap_empty(&ms->usage->subsection_map[0],
+ SUBSECTIONS_PER_SECTION);
+}
+
+static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
+{
+ struct mem_section *ms = __pfn_to_section(pfn);
+ DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
+ unsigned long *subsection_map;
+ int rc = 0;
+
+ subsection_mask_set(map, pfn, nr_pages);
+
+ subsection_map = &ms->usage->subsection_map[0];
+
+ if (bitmap_empty(map, SUBSECTIONS_PER_SECTION))
+ rc = -EINVAL;
+ else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION))
+ rc = -EEXIST;
+ else
+ bitmap_or(subsection_map, map, subsection_map,
+ SUBSECTIONS_PER_SECTION);
+
+ return rc;
+}
#else
void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages)
{
}
+
+static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages)
+{
+ return 0;
+}
+
+static bool is_subsection_map_empty(struct mem_section *ms)
+{
+ return true;
+}
+
+static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
+{
+ return 0;
+}
#endif
/* Record a memory area against a node. */
@@ -732,45 +796,6 @@ static void free_map_bootmem(struct page *memmap)
}
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
-#ifdef CONFIG_SPARSEMEM_VMEMMAP
-static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages)
-{
- DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
- DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 };
- struct mem_section *ms = __pfn_to_section(pfn);
- unsigned long *subsection_map = ms->usage
- ? &ms->usage->subsection_map[0] : NULL;
-
- subsection_mask_set(map, pfn, nr_pages);
- if (subsection_map)
- bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION);
-
- if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION),
- "section already deactivated (%#lx + %ld)\n",
- pfn, nr_pages))
- return -EINVAL;
-
- bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION);
- return 0;
-}
-
-static bool is_subsection_map_empty(struct mem_section *ms)
-{
- return bitmap_empty(&ms->usage->subsection_map[0],
- SUBSECTIONS_PER_SECTION);
-}
-#else
-static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages)
-{
- return 0;
-}
-
-static bool is_subsection_map_empty(struct mem_section *ms)
-{
- return true;
-}
-#endif
-
/*
* To deactivate a memory region, there are 3 cases to handle across
* two configurations (SPARSEMEM_VMEMMAP={y,n}):
@@ -825,35 +850,6 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages,
ms->section_mem_map = (unsigned long)NULL;
}
-#ifdef CONFIG_SPARSEMEM_VMEMMAP
-static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
-{
- struct mem_section *ms = __pfn_to_section(pfn);
- DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
- unsigned long *subsection_map;
- int rc = 0;
-
- subsection_mask_set(map, pfn, nr_pages);
-
- subsection_map = &ms->usage->subsection_map[0];
-
- if (bitmap_empty(map, SUBSECTIONS_PER_SECTION))
- rc = -EINVAL;
- else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION))
- rc = -EEXIST;
- else
- bitmap_or(subsection_map, map, subsection_map,
- SUBSECTIONS_PER_SECTION);
-
- return rc;
-}
-#else
-static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
-{
- return 0;
-}
-#endif
-
static struct page * __meminit section_activate(int nid, unsigned long pfn,
unsigned long nr_pages, struct vmem_altmap *altmap)
{
--
2.17.2
prev parent reply other threads:[~2020-03-12 12:44 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-12 12:44 [PATCH v4 0/5] mm/hotplug: Only use subsection map for VMEMMAP Baoquan He
2020-03-12 12:44 ` [PATCH v4 1/5] mm/sparse.c: introduce new function fill_subsection_map() Baoquan He
2020-03-12 13:30 ` Pankaj Gupta
2020-03-12 12:44 ` [PATCH v4 2/5] mm/sparse.c: introduce a new function clear_subsection_map() Baoquan He
2020-03-12 13:26 ` Pankaj Gupta
2020-03-12 12:44 ` [PATCH v4 3/5] mm/sparse.c: only use subsection map in VMEMMAP case Baoquan He
2020-03-12 12:44 ` [PATCH v4 4/5] mm/sparse.c: add note about only VMEMMAP supporting sub-section hotplug Baoquan He
2020-03-12 13:45 ` David Hildenbrand
2020-03-12 12:44 ` Baoquan He [this message]
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