Re: [PATCH v2 6/7] mm/sparse.c: move subsection_map related codes together

Wei Yang
2020-02-20T06:18:18Z

On Thu, Feb 20, 2020 at 12:33:15PM +0800, Baoquan He wrote:
>No functional change.
>

Those functions are introduced in your previous patches.

Is it possible to define them close to each other at the very beginning?

>Signed-off-by: Baoquan He <bhe@redhat.com>
>---
> mm/sparse.c | 172 +++++++++++++++++++++++++---------------------------
> 1 file changed, 84 insertions(+), 88 deletions(-)
>
>diff --git a/mm/sparse.c b/mm/sparse.c
>index 14bff0b44e7c..053d6c2e5c1f 100644
>--- a/mm/sparse.c
>+++ b/mm/sparse.c
>@@ -244,10 +244,94 @@ void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages)
> nr_pages -= pfns;
> }
> }
>+
>+/**
>+ * clear_subsection_map - Clear subsection map of one memory region
>+ *
>+ * @pfn - start pfn of the memory range
>+ * @nr_pages - number of pfns to add in the region
>+ *
>+ * This is only intended for hotplug, and clear the related subsection
>+ * map inside one section.
>+ *
>+ * Return:
>+ * * -EINVAL - Section already deactived.
>+ * * 0 - Subsection map is emptied.
>+ * * 1 - Subsection map is not empty.
>+ */
>+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);
>+
>+ if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION))
>+ return 0;
>+
>+ return 1;
>+}
>+
>+/**
>+ * fill_subsection_map - fill subsection map of a memory region
>+ * @pfn - start pfn of the memory range
>+ * @nr_pages - number of pfns to add in the region
>+ *
>+ * This fills the related subsection map inside one section, and only
>+ * intended for hotplug.
>+ *
>+ * Return:
>+ * * 0 - On success.
>+ * * -EINVAL - Invalid memory region.
>+ * * -EEXIST - Subsection map has been set.
>+ */
>+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 int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
>+{
>+ return 0;
>+}
> #endif
>
> /* Record a memory area against a node. */
>@@ -732,52 +816,6 @@ static void free_map_bootmem(struct page *memmap)
> }
> #endif /* CONFIG_SPARSEMEM_VMEMMAP */
>
>-#ifdef CONFIG_SPARSEMEM_VMEMMAP
>-/**
>- * clear_subsection_map - Clear subsection map of one memory region
>- *
>- * @pfn - start pfn of the memory range
>- * @nr_pages - number of pfns to add in the region
>- *
>- * This is only intended for hotplug, and clear the related subsection
>- * map inside one section.
>- *
>- * Return:
>- * * -EINVAL - Section already deactived.
>- * * 0 - Subsection map is emptied.
>- * * 1 - Subsection map is not empty.
>- */
>-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);
>-
>- if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION))
>- return 0;
>-
>- return 1;
>-}
>-#else
>-static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages)
>-{
>- return 0;
>-}
>-#endif
>-
> /*
> * To deactivate a memory region, there are 3 cases to handle across
> * two configurations (SPARSEMEM_VMEMMAP={y,n}):
>@@ -833,48 +871,6 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages,
> ms->section_mem_map = (unsigned long)NULL;
> }
>
>-#ifdef CONFIG_SPARSEMEM_VMEMMAP
>-/**
>- * fill_subsection_map - fill subsection map of a memory region
>- * @pfn - start pfn of the memory range
>- * @nr_pages - number of pfns to add in the region
>- *
>- * This fills the related subsection map inside one section, and only
>- * intended for hotplug.
>- *
>- * Return:
>- * * 0 - On success.
>- * * -EINVAL - Invalid memory region.
>- * * -EEXIST - Subsection map has been set.
>- */
>-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

--
Wei Yang
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