+ mm-memblock-introduce-pfn_valid_region.patch added to -mm tree

[akpm@xxxxxxxxxxxxxxxxxxxx]

The patch titled
     Subject: mm/memblock: introduce pfn_valid_region()
has been added to the -mm tree.  Its filename is
     mm-memblock-introduce-pfn_valid_region.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-memblock-introduce-pfn_valid_region.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-memblock-introduce-pfn_valid_region.patch

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------------------------------------------------------
From: Jia He <jia.he@xxxxxxxxxxxxxxxx>
Subject: mm/memblock: introduce pfn_valid_region()

b92df1de5d28 ("mm: page_alloc: skip over regions of invalid pfns where
possible") optimized the loop in memmap_init_zone().  But there is still
some room for improvement.  E.g.  in early_pfn_valid(), we can record the
last returned memblock region.  If current pfn and last pfn are in the
same memory region, we needn't do the unnecessary binary searches because
memblock_is_nomap is the same result for whole memory region.

Link: http://lkml.kernel.org/r/1530867675-9018-6-git-send-email-hejianet@xxxxxxxxx
Signed-off-by: Jia He <jia.he@xxxxxxxxxxxxxxxx>
Cc: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Daniel Jordan <daniel.m.jordan@xxxxxxxxxx>
Cc: Daniel Vacek <neelx@xxxxxxxxxx>
Cc: Eugeniu Rosca <erosca@xxxxxxxxxxxxxx>
Cc: Gioh Kim <gi-oh.kim@xxxxxxxxxxxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Kemi Wang <kemi.wang@xxxxxxxxx>
Cc: Laura Abbott <labbott@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Nikolay Borisov <nborisov@xxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Petr Tesarik <ptesarik@xxxxxxxx>
Cc: Philip Derrin <philip@cog.systems>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Steve Capper <steve.capper@xxxxxxx>
Cc: Vladimir Murzin <vladimir.murzin@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: YASUAKI ISHIMATSU <yasu.isimatu@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/memblock.c |   24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff -puN mm/memblock.c~mm-memblock-introduce-pfn_valid_region mm/memblock.c
--- a/mm/memblock.c~mm-memblock-introduce-pfn_valid_region
+++ a/mm/memblock.c
@@ -1188,6 +1188,30 @@ ulong __init_memblock memblock_next_vali
 	return PHYS_PFN(regions[early_region_idx].base);
 }
 EXPORT_SYMBOL(memblock_next_valid_pfn);
+
+int pfn_valid_region(ulong pfn)
+{
+	ulong start_pfn, end_pfn;
+	struct memblock_type *type = &memblock.memory;
+	struct memblock_region *regions = type->regions;
+
+	if (early_region_idx != -1) {
+		start_pfn = PFN_DOWN(regions[early_region_idx].base);
+		end_pfn = PFN_DOWN(regions[early_region_idx].base +
+					regions[early_region_idx].size);
+
+		if (pfn >= start_pfn && pfn < end_pfn)
+			return !memblock_is_nomap(
+					&regions[early_region_idx]);
+	}
+
+	early_region_idx = memblock_search_pfn_regions(pfn);
+	if (early_region_idx == -1)
+		return false;
+
+	return !memblock_is_nomap(&regions[early_region_idx]);
+}
+EXPORT_SYMBOL(pfn_valid_region);
 #endif /*CONFIG_HAVE_MEMBLOCK_PFN_VALID*/
 
 static phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size,
_

Patches currently in -mm which might be from jia.he@xxxxxxxxxxxxxxxx are

arm-arm64-introduce-config_have_memblock_pfn_valid.patch
mm-page_alloc-remain-memblock_next_valid_pfn-on-arm-arm64.patch
mm-page_alloc-reduce-unnecessary-binary-search-in-memblock_next_valid_pfn.patch
mm-memblock-introduce-memblock_search_pfn_regions.patch
mm-memblock-introduce-pfn_valid_region.patch
mm-page_alloc-reduce-unnecessary-binary-search-in-early_pfn_valid.patch

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