Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/mm/sparse.c b/mm/sparse.c
index 10b07ee..f6891c1 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -5,12 +5,14 @@
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/mmzone.h>
-#include <linux/bootmem.h>
+#include <linux/memblock.h>
#include <linux/compiler.h>
#include <linux/highmem.h>
#include <linux/export.h>
#include <linux/spinlock.h>
#include <linux/vmalloc.h>
+#include <linux/swap.h>
+#include <linux/swapops.h>
#include "internal.h"
#include <asm/dma.h>
@@ -65,10 +67,15 @@
unsigned long array_size = SECTIONS_PER_ROOT *
sizeof(struct mem_section);
- if (slab_is_available())
+ if (slab_is_available()) {
section = kzalloc_node(array_size, GFP_KERNEL, nid);
- else
- section = memblock_virt_alloc_node(array_size, nid);
+ } else {
+ section = memblock_alloc_node(array_size, SMP_CACHE_BYTES,
+ nid);
+ if (!section)
+ panic("%s: Failed to allocate %lu bytes nid=%d\n",
+ __func__, array_size, nid);
+ }
return section;
}
@@ -78,8 +85,15 @@
unsigned long root = SECTION_NR_TO_ROOT(section_nr);
struct mem_section *section;
+ /*
+ * An existing section is possible in the sub-section hotplug
+ * case. First hot-add instantiates, follow-on hot-add reuses
+ * the existing section.
+ *
+ * The mem_hotplug_lock resolves the apparent race below.
+ */
if (mem_section[root])
- return -EEXIST;
+ return 0;
section = sparse_index_alloc(nid);
if (!section)
@@ -97,7 +111,7 @@
#endif
#ifdef CONFIG_SPARSEMEM_EXTREME
-int __section_nr(struct mem_section* ms)
+unsigned long __section_nr(struct mem_section *ms)
{
unsigned long root_nr;
struct mem_section *root = NULL;
@@ -116,9 +130,9 @@
return (root_nr * SECTIONS_PER_ROOT) + (ms - root);
}
#else
-int __section_nr(struct mem_section* ms)
+unsigned long __section_nr(struct mem_section *ms)
{
- return (int)(ms - mem_section[0]);
+ return (unsigned long)(ms - mem_section[0]);
}
#endif
@@ -173,10 +187,10 @@
* Keeping track of this gives us an easy way to break out of
* those loops early.
*/
-int __highest_present_section_nr;
+unsigned long __highest_present_section_nr;
static void section_mark_present(struct mem_section *ms)
{
- int section_nr = __section_nr(ms);
+ unsigned long section_nr = __section_nr(ms);
if (section_nr > __highest_present_section_nr)
__highest_present_section_nr = section_nr;
@@ -184,7 +198,7 @@
ms->section_mem_map |= SECTION_MARKED_PRESENT;
}
-static inline int next_present_section_nr(int section_nr)
+static inline unsigned long next_present_section_nr(unsigned long section_nr)
{
do {
section_nr++;
@@ -196,7 +210,7 @@
}
#define for_each_present_section_nr(start, section_nr) \
for (section_nr = next_present_section_nr(start-1); \
- ((section_nr >= 0) && \
+ ((section_nr != -1) && \
(section_nr <= __highest_present_section_nr)); \
section_nr = next_present_section_nr(section_nr))
@@ -205,6 +219,41 @@
return next_present_section_nr(-1);
}
+static void subsection_mask_set(unsigned long *map, unsigned long pfn,
+ unsigned long nr_pages)
+{
+ int idx = subsection_map_index(pfn);
+ int end = subsection_map_index(pfn + nr_pages - 1);
+
+ bitmap_set(map, idx, end - idx + 1);
+}
+
+void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages)
+{
+ int end_sec = pfn_to_section_nr(pfn + nr_pages - 1);
+ unsigned long nr, start_sec = pfn_to_section_nr(pfn);
+
+ if (!nr_pages)
+ return;
+
+ for (nr = start_sec; nr <= end_sec; nr++) {
+ struct mem_section *ms;
+ unsigned long pfns;
+
+ pfns = min(nr_pages, PAGES_PER_SECTION
+ - (pfn & ~PAGE_SECTION_MASK));
+ ms = __nr_to_section(nr);
+ subsection_mask_set(ms->usage->subsection_map, pfn, pfns);
+
+ pr_debug("%s: sec: %lu pfns: %lu set(%d, %d)\n", __func__, nr,
+ pfns, subsection_map_index(pfn),
+ subsection_map_index(pfn + pfns - 1));
+
+ pfn += pfns;
+ nr_pages -= pfns;
+ }
+}
+
/* Record a memory area against a node. */
void __init memory_present(int nid, unsigned long start, unsigned long end)
{
@@ -216,7 +265,10 @@
size = sizeof(struct mem_section*) * NR_SECTION_ROOTS;
align = 1 << (INTERNODE_CACHE_SHIFT);
- mem_section = memblock_virt_alloc(size, align);
+ mem_section = memblock_alloc(size, align);
+ if (!mem_section)
+ panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
+ __func__, size, align);
}
#endif
@@ -239,6 +291,22 @@
}
/*
+ * Mark all memblocks as present using memory_present(). This is a
+ * convienence function that is useful for a number of arches
+ * to mark all of the systems memory as present during initialization.
+ */
+void __init memblocks_present(void)
+{
+ struct memblock_region *reg;
+
+ for_each_memblock(memory, reg) {
+ memory_present(memblock_get_region_node(reg),
+ memblock_region_memory_base_pfn(reg),
+ memblock_region_memory_end_pfn(reg));
+ }
+}
+
+/*
* Subtle, we encode the real pfn into the mem_map such that
* the identity pfn - section_mem_map will return the actual
* physical page frame number.
@@ -264,33 +332,31 @@
static void __meminit sparse_init_one_section(struct mem_section *ms,
unsigned long pnum, struct page *mem_map,
- unsigned long *pageblock_bitmap)
+ struct mem_section_usage *usage, unsigned long flags)
{
ms->section_mem_map &= ~SECTION_MAP_MASK;
- ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) |
- SECTION_HAS_MEM_MAP;
- ms->pageblock_flags = pageblock_bitmap;
+ ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum)
+ | SECTION_HAS_MEM_MAP | flags;
+ ms->usage = usage;
}
-unsigned long usemap_size(void)
+static unsigned long usemap_size(void)
{
return BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS) * sizeof(unsigned long);
}
-#ifdef CONFIG_MEMORY_HOTPLUG
-static unsigned long *__kmalloc_section_usemap(void)
+size_t mem_section_usage_size(void)
{
- return kmalloc(usemap_size(), GFP_KERNEL);
+ return sizeof(struct mem_section_usage) + usemap_size();
}
-#endif /* CONFIG_MEMORY_HOTPLUG */
#ifdef CONFIG_MEMORY_HOTREMOVE
-static unsigned long * __init
+static struct mem_section_usage * __init
sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
unsigned long size)
{
+ struct mem_section_usage *usage;
unsigned long goal, limit;
- unsigned long *p;
int nid;
/*
* A page may contain usemaps for other sections preventing the
@@ -306,17 +372,16 @@
limit = goal + (1UL << PA_SECTION_SHIFT);
nid = early_pfn_to_nid(goal >> PAGE_SHIFT);
again:
- p = memblock_virt_alloc_try_nid_nopanic(size,
- SMP_CACHE_BYTES, goal, limit,
- nid);
- if (!p && limit) {
+ usage = memblock_alloc_try_nid(size, SMP_CACHE_BYTES, goal, limit, nid);
+ if (!usage && limit) {
limit = 0;
goto again;
}
- return p;
+ return usage;
}
-static void __init check_usemap_section_nr(int nid, unsigned long *usemap)
+static void __init check_usemap_section_nr(int nid,
+ struct mem_section_usage *usage)
{
unsigned long usemap_snr, pgdat_snr;
static unsigned long old_usemap_snr;
@@ -330,7 +395,7 @@
old_pgdat_snr = NR_MEM_SECTIONS;
}
- usemap_snr = pfn_to_section_nr(__pa(usemap) >> PAGE_SHIFT);
+ usemap_snr = pfn_to_section_nr(__pa(usage) >> PAGE_SHIFT);
pgdat_snr = pfn_to_section_nr(__pa(pgdat) >> PAGE_SHIFT);
if (usemap_snr == pgdat_snr)
return;
@@ -358,14 +423,15 @@
usemap_snr, pgdat_snr, nid);
}
#else
-static unsigned long * __init
+static struct mem_section_usage * __init
sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
unsigned long size)
{
- return memblock_virt_alloc_node_nopanic(size, pgdat->node_id);
+ return memblock_alloc_node(size, SMP_CACHE_BYTES, pgdat->node_id);
}
-static void __init check_usemap_section_nr(int nid, unsigned long *usemap)
+static void __init check_usemap_section_nr(int nid,
+ struct mem_section_usage *usage)
{
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
@@ -382,18 +448,23 @@
return PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION);
}
-struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid,
- struct vmem_altmap *altmap)
+struct page __init *__populate_section_memmap(unsigned long pfn,
+ unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
{
unsigned long size = section_map_size();
struct page *map = sparse_buffer_alloc(size);
+ phys_addr_t addr = __pa(MAX_DMA_ADDRESS);
if (map)
return map;
- map = memblock_virt_alloc_try_nid(size,
- PAGE_SIZE, __pa(MAX_DMA_ADDRESS),
- BOOTMEM_ALLOC_ACCESSIBLE, nid);
+ map = memblock_alloc_try_nid(size,
+ PAGE_SIZE, addr,
+ MEMBLOCK_ALLOC_ACCESSIBLE, nid);
+ if (!map)
+ panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%pa\n",
+ __func__, size, PAGE_SIZE, nid, &addr);
+
return map;
}
#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
@@ -401,13 +472,20 @@
static void *sparsemap_buf __meminitdata;
static void *sparsemap_buf_end __meminitdata;
+static inline void __meminit sparse_buffer_free(unsigned long size)
+{
+ WARN_ON(!sparsemap_buf || size == 0);
+ memblock_free_early(__pa(sparsemap_buf), size);
+}
+
static void __init sparse_buffer_init(unsigned long size, int nid)
{
+ phys_addr_t addr = __pa(MAX_DMA_ADDRESS);
WARN_ON(sparsemap_buf); /* forgot to call sparse_buffer_fini()? */
sparsemap_buf =
- memblock_virt_alloc_try_nid_raw(size, PAGE_SIZE,
- __pa(MAX_DMA_ADDRESS),
- BOOTMEM_ALLOC_ACCESSIBLE, nid);
+ memblock_alloc_try_nid_raw(size, PAGE_SIZE,
+ addr,
+ MEMBLOCK_ALLOC_ACCESSIBLE, nid);
sparsemap_buf_end = sparsemap_buf + size;
}
@@ -416,7 +494,7 @@
unsigned long size = sparsemap_buf_end - sparsemap_buf;
if (sparsemap_buf && size > 0)
- memblock_free_early(__pa(sparsemap_buf), size);
+ sparse_buffer_free(size);
sparsemap_buf = NULL;
}
@@ -425,11 +503,15 @@
void *ptr = NULL;
if (sparsemap_buf) {
- ptr = PTR_ALIGN(sparsemap_buf, size);
+ ptr = (void *) roundup((unsigned long)sparsemap_buf, size);
if (ptr + size > sparsemap_buf_end)
ptr = NULL;
- else
+ else {
+ /* Free redundant aligned space */
+ if ((unsigned long)(ptr - sparsemap_buf) > 0)
+ sparse_buffer_free((unsigned long)(ptr - sparsemap_buf));
sparsemap_buf = ptr + size;
+ }
}
return ptr;
}
@@ -446,32 +528,35 @@
unsigned long pnum_end,
unsigned long map_count)
{
- unsigned long pnum, usemap_longs, *usemap;
+ struct mem_section_usage *usage;
+ unsigned long pnum;
struct page *map;
- usemap_longs = BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS);
- usemap = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nid),
- usemap_size() *
- map_count);
- if (!usemap) {
+ usage = sparse_early_usemaps_alloc_pgdat_section(NODE_DATA(nid),
+ mem_section_usage_size() * map_count);
+ if (!usage) {
pr_err("%s: node[%d] usemap allocation failed", __func__, nid);
goto failed;
}
sparse_buffer_init(map_count * section_map_size(), nid);
for_each_present_section_nr(pnum_begin, pnum) {
+ unsigned long pfn = section_nr_to_pfn(pnum);
+
if (pnum >= pnum_end)
break;
- map = sparse_mem_map_populate(pnum, nid, NULL);
+ map = __populate_section_memmap(pfn, PAGES_PER_SECTION,
+ nid, NULL);
if (!map) {
pr_err("%s: node[%d] memory map backing failed. Some memory will not be available.",
__func__, nid);
pnum_begin = pnum;
goto failed;
}
- check_usemap_section_nr(nid, usemap);
- sparse_init_one_section(__nr_to_section(pnum), pnum, map, usemap);
- usemap += usemap_longs;
+ check_usemap_section_nr(nid, usage);
+ sparse_init_one_section(__nr_to_section(pnum), pnum, map, usage,
+ SECTION_IS_EARLY);
+ usage = (void *) usage + mem_section_usage_size();
}
sparse_buffer_fini();
return;
@@ -539,7 +624,7 @@
}
#ifdef CONFIG_MEMORY_HOTREMOVE
-/* Mark all memory sections within the pfn range as online */
+/* Mark all memory sections within the pfn range as offline */
void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn)
{
unsigned long pfn;
@@ -562,21 +647,20 @@
#endif
#ifdef CONFIG_SPARSEMEM_VMEMMAP
-static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
- struct vmem_altmap *altmap)
+static struct page *populate_section_memmap(unsigned long pfn,
+ unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
{
- /* This will make the necessary allocations eventually. */
- return sparse_mem_map_populate(pnum, nid, altmap);
+ return __populate_section_memmap(pfn, nr_pages, nid, altmap);
}
-static void __kfree_section_memmap(struct page *memmap,
+
+static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages,
struct vmem_altmap *altmap)
{
- unsigned long start = (unsigned long)memmap;
- unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION);
+ unsigned long start = (unsigned long) pfn_to_page(pfn);
+ unsigned long end = start + nr_pages * sizeof(struct page);
vmemmap_free(start, end, altmap);
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
static void free_map_bootmem(struct page *memmap)
{
unsigned long start = (unsigned long)memmap;
@@ -584,9 +668,9 @@
vmemmap_free(start, end, NULL);
}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
#else
-static struct page *__kmalloc_section_memmap(void)
+struct page *populate_section_memmap(unsigned long pfn,
+ unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
{
struct page *page, *ret;
unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION;
@@ -607,15 +691,11 @@
return ret;
}
-static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
+static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages,
struct vmem_altmap *altmap)
{
- return __kmalloc_section_memmap();
-}
+ struct page *memmap = pfn_to_page(pfn);
-static void __kfree_section_memmap(struct page *memmap,
- struct vmem_altmap *altmap)
-{
if (is_vmalloc_addr(memmap))
vfree(memmap);
else
@@ -623,7 +703,6 @@
get_order(sizeof(struct page) * PAGES_PER_SECTION));
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
static void free_map_bootmem(struct page *memmap)
{
unsigned long maps_section_nr, removing_section_nr, i;
@@ -653,81 +732,182 @@
put_page_bootmem(page);
}
}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
-/*
- * returns the number of sections whose mem_maps were properly
- * set. If this is <=0, then that means that the passed-in
- * map was not consumed and must be freed.
+static void section_deactivate(unsigned long pfn, unsigned long nr_pages,
+ struct vmem_altmap *altmap)
+{
+ DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
+ DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 };
+ struct mem_section *ms = __pfn_to_section(pfn);
+ bool section_is_early = early_section(ms);
+ struct page *memmap = NULL;
+ 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;
+
+ /*
+ * There are 3 cases to handle across two configurations
+ * (SPARSEMEM_VMEMMAP={y,n}):
+ *
+ * 1/ deactivation of a partial hot-added section (only possible
+ * in the SPARSEMEM_VMEMMAP=y case).
+ * a/ section was present at memory init
+ * b/ section was hot-added post memory init
+ * 2/ deactivation of a complete hot-added section
+ * 3/ deactivation of a complete section from memory init
+ *
+ * For 1/, when subsection_map does not empty we will not be
+ * freeing the usage map, but still need to free the vmemmap
+ * range.
+ *
+ * For 2/ and 3/ the SPARSEMEM_VMEMMAP={y,n} cases are unified
+ */
+ bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION);
+ if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION)) {
+ unsigned long section_nr = pfn_to_section_nr(pfn);
+
+ if (!section_is_early) {
+ kfree(ms->usage);
+ ms->usage = NULL;
+ }
+ memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
+ ms->section_mem_map = sparse_encode_mem_map(NULL, section_nr);
+ }
+
+ if (section_is_early && memmap)
+ free_map_bootmem(memmap);
+ else
+ depopulate_section_memmap(pfn, nr_pages, altmap);
+}
+
+static struct page * __meminit section_activate(int nid, unsigned long pfn,
+ unsigned long nr_pages, struct vmem_altmap *altmap)
+{
+ DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 };
+ struct mem_section *ms = __pfn_to_section(pfn);
+ struct mem_section_usage *usage = NULL;
+ unsigned long *subsection_map;
+ struct page *memmap;
+ int rc = 0;
+
+ subsection_mask_set(map, pfn, nr_pages);
+
+ if (!ms->usage) {
+ usage = kzalloc(mem_section_usage_size(), GFP_KERNEL);
+ if (!usage)
+ return ERR_PTR(-ENOMEM);
+ ms->usage = usage;
+ }
+ 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);
+
+ if (rc) {
+ if (usage)
+ ms->usage = NULL;
+ kfree(usage);
+ return ERR_PTR(rc);
+ }
+
+ /*
+ * The early init code does not consider partially populated
+ * initial sections, it simply assumes that memory will never be
+ * referenced. If we hot-add memory into such a section then we
+ * do not need to populate the memmap and can simply reuse what
+ * is already there.
+ */
+ if (nr_pages < PAGES_PER_SECTION && early_section(ms))
+ return pfn_to_page(pfn);
+
+ memmap = populate_section_memmap(pfn, nr_pages, nid, altmap);
+ if (!memmap) {
+ section_deactivate(pfn, nr_pages, altmap);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return memmap;
+}
+
+/**
+ * sparse_add_section - add a memory section, or populate an existing one
+ * @nid: The node to add section on
+ * @start_pfn: start pfn of the memory range
+ * @nr_pages: number of pfns to add in the section
+ * @altmap: device page map
+ *
+ * This is only intended for hotplug.
+ *
+ * Return:
+ * * 0 - On success.
+ * * -EEXIST - Section has been present.
+ * * -ENOMEM - Out of memory.
*/
-int __meminit sparse_add_one_section(struct pglist_data *pgdat,
- unsigned long start_pfn, struct vmem_altmap *altmap)
+int __meminit sparse_add_section(int nid, unsigned long start_pfn,
+ unsigned long nr_pages, struct vmem_altmap *altmap)
{
unsigned long section_nr = pfn_to_section_nr(start_pfn);
struct mem_section *ms;
struct page *memmap;
- unsigned long *usemap;
- unsigned long flags;
int ret;
- /*
- * no locking for this, because it does its own
- * plus, it does a kmalloc
- */
- ret = sparse_index_init(section_nr, pgdat->node_id);
- if (ret < 0 && ret != -EEXIST)
+ ret = sparse_index_init(section_nr, nid);
+ if (ret < 0)
return ret;
- ret = 0;
- memmap = kmalloc_section_memmap(section_nr, pgdat->node_id, altmap);
- if (!memmap)
- return -ENOMEM;
- usemap = __kmalloc_section_usemap();
- if (!usemap) {
- __kfree_section_memmap(memmap, altmap);
- return -ENOMEM;
- }
- pgdat_resize_lock(pgdat, &flags);
+ memmap = section_activate(nid, start_pfn, nr_pages, altmap);
+ if (IS_ERR(memmap))
+ return PTR_ERR(memmap);
- ms = __pfn_to_section(start_pfn);
- if (ms->section_mem_map & SECTION_MARKED_PRESENT) {
- ret = -EEXIST;
- goto out;
- }
-
-#ifdef CONFIG_DEBUG_VM
/*
* Poison uninitialized struct pages in order to catch invalid flags
* combinations.
*/
- memset(memmap, PAGE_POISON_PATTERN, sizeof(struct page) * PAGES_PER_SECTION);
-#endif
+ page_init_poison(pfn_to_page(start_pfn), sizeof(struct page) * nr_pages);
+ ms = __nr_to_section(section_nr);
+ set_section_nid(section_nr, nid);
section_mark_present(ms);
- sparse_init_one_section(ms, section_nr, memmap, usemap);
-out:
- pgdat_resize_unlock(pgdat, &flags);
- if (ret < 0) {
- kfree(usemap);
- __kfree_section_memmap(memmap, altmap);
- }
- return ret;
+ /* Align memmap to section boundary in the subsection case */
+ if (section_nr_to_pfn(section_nr) != start_pfn)
+ memmap = pfn_to_kaddr(section_nr_to_pfn(section_nr));
+ sparse_init_one_section(ms, section_nr, memmap, ms->usage, 0);
+
+ return 0;
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
#ifdef CONFIG_MEMORY_FAILURE
static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
{
int i;
- if (!memmap)
+ /*
+ * A further optimization is to have per section refcounted
+ * num_poisoned_pages. But that would need more space per memmap, so
+ * for now just do a quick global check to speed up this routine in the
+ * absence of bad pages.
+ */
+ if (atomic_long_read(&num_poisoned_pages) == 0)
return;
for (i = 0; i < nr_pages; i++) {
if (PageHWPoison(&memmap[i])) {
- atomic_long_sub(1, &num_poisoned_pages);
+ num_poisoned_pages_dec();
ClearPageHWPoison(&memmap[i]);
}
}
@@ -738,54 +918,12 @@
}
#endif
-static void free_section_usemap(struct page *memmap, unsigned long *usemap,
+void sparse_remove_section(struct mem_section *ms, unsigned long pfn,
+ unsigned long nr_pages, unsigned long map_offset,
struct vmem_altmap *altmap)
{
- struct page *usemap_page;
-
- if (!usemap)
- return;
-
- usemap_page = virt_to_page(usemap);
- /*
- * Check to see if allocation came from hot-plug-add
- */
- if (PageSlab(usemap_page) || PageCompound(usemap_page)) {
- kfree(usemap);
- if (memmap)
- __kfree_section_memmap(memmap, altmap);
- return;
- }
-
- /*
- * The usemap came from bootmem. This is packed with other usemaps
- * on the section which has pgdat at boot time. Just keep it as is now.
- */
-
- if (memmap)
- free_map_bootmem(memmap);
+ clear_hwpoisoned_pages(pfn_to_page(pfn) + map_offset,
+ nr_pages - map_offset);
+ section_deactivate(pfn, nr_pages, altmap);
}
-
-void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
- unsigned long map_offset, struct vmem_altmap *altmap)
-{
- struct page *memmap = NULL;
- unsigned long *usemap = NULL, flags;
- struct pglist_data *pgdat = zone->zone_pgdat;
-
- pgdat_resize_lock(pgdat, &flags);
- if (ms->section_mem_map) {
- usemap = ms->pageblock_flags;
- memmap = sparse_decode_mem_map(ms->section_mem_map,
- __section_nr(ms));
- ms->section_mem_map = 0;
- ms->pageblock_flags = NULL;
- }
- pgdat_resize_unlock(pgdat, &flags);
-
- clear_hwpoisoned_pages(memmap + map_offset,
- PAGES_PER_SECTION - map_offset);
- free_section_usemap(memmap, usemap, altmap);
-}
-#endif /* CONFIG_MEMORY_HOTREMOVE */
#endif /* CONFIG_MEMORY_HOTPLUG */