linux-kernel - [RFC v2 30/43] memblock: PKRAM: mark memblocks that contain preserved pages

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Date:   Tue, 30 Mar 2021 14:36:05 -0700
From:   Anthony Yznaga <anthony.yznaga@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     willy@...radead.org, corbet@....net, tglx@...utronix.de,
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Subject: [RFC v2 30/43] memblock: PKRAM: mark memblocks that contain preserved pages

To support deferred initialization of page structs for preserved pages,
separate memblocks containing preserved pages by setting a new flag
when adding them to the memblock reserved list.

Signed-off-by: Anthony Yznaga <anthony.yznaga@...cle.com>
---
 include/linux/memblock.h | 6 ++++++
 mm/pkram.c               | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index d13e3cd938b4..39c53d08d9f7 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -37,6 +37,7 @@ enum memblock_flags {
 	MEMBLOCK_HOTPLUG	= 0x1,	/* hotpluggable region */
 	MEMBLOCK_MIRROR		= 0x2,	/* mirrored region */
 	MEMBLOCK_NOMAP		= 0x4,	/* don't add to kernel direct mapping */
+	MEMBLOCK_PRESERVED	= 0x8,	/* preserved pages region */
 };
 
 /**
@@ -248,6 +249,11 @@ static inline bool memblock_is_nomap(struct memblock_region *m)
 	return m->flags & MEMBLOCK_NOMAP;
 }
 
+static inline bool memblock_is_preserved(struct memblock_region *m)
+{
+	return m->flags & MEMBLOCK_PRESERVED;
+}
+
 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
 			    unsigned long  *end_pfn);
 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
diff --git a/mm/pkram.c b/mm/pkram.c
index b8d6b549fa6c..08144c18d425 100644
--- a/mm/pkram.c
+++ b/mm/pkram.c
@@ -1607,6 +1607,7 @@ int __init pkram_create_merged_reserved(struct memblock_type *new)
 		} else if (pkr->base + pkr->size <= r->base) {
 			rgn->base = pkr->base;
 			rgn->size = pkr->size;
+			rgn->flags = MEMBLOCK_PRESERVED;
 			memblock_set_region_node(rgn, MAX_NUMNODES);
 
 			nr_preserved +=  (rgn->size >> PAGE_SHIFT);
@@ -1636,6 +1637,7 @@ int __init pkram_create_merged_reserved(struct memblock_type *new)
 		rgn = &new->regions[k];
 		rgn->base = pkr->base;
 		rgn->size = pkr->size;
+		rgn->flags = MEMBLOCK_PRESERVED;
 		memblock_set_region_node(rgn, MAX_NUMNODES);
 
 		nr_preserved += (rgn->size >> PAGE_SHIFT);
-- 
1.8.3.1