[PATCH v6 5/5] mm/sparse: Remove CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER

Baoquan He
2018-06-28T06:29:37Z

Pavel pointed out that the behaviour of allocating memmap together
for one node should be defaulted for all ARCH-es. It won't break
anything because it will drop to the fallback action to allocate
imemmap for each section at one time if failed on large chunk of
memory.

So remove CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER and clean up the
related codes.

Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
---
mm/Kconfig | 4 ----
mm/sparse.c | 32 ++------------------------------
2 files changed, 2 insertions(+), 34 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index ce95491abd6a..75a196bf83e6 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -115,10 +115,6 @@ config SPARSEMEM_EXTREME
config SPARSEMEM_VMEMMAP_ENABLE
bool

-config SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
- def_bool y
- depends on SPARSEMEM && X86_64
-
config SPARSEMEM_VMEMMAP
bool "Sparse Memory virtual memmap"
depends on SPARSEMEM && SPARSEMEM_VMEMMAP_ENABLE
diff --git a/mm/sparse.c b/mm/sparse.c
index e1767d9fe4f3..d18e2697a781 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -458,7 +458,6 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
}
#endif /* !CONFIG_SPARSEMEM_VMEMMAP */

-#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
static void __init sparse_early_mem_maps_alloc_node(void *data,
unsigned long pnum_begin,
unsigned long pnum_end,
@@ -468,22 +467,6 @@ static void __init sparse_early_mem_maps_alloc_node(void *data,
sparse_mem_maps_populate_node(map_map, pnum_begin, pnum_end,
map_count, nodeid);
}
-#else
-static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
-{
- struct page *map;
- struct mem_section *ms = __nr_to_section(pnum);
- int nid = sparse_early_nid(ms);
-
- map = sparse_mem_map_populate(pnum, nid, NULL);
- if (map)
- return map;
-
- pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
- __func__);
- return NULL;
-}
-#endif

void __weak __meminit vmemmap_populate_print_last(void)
{
@@ -545,14 +528,11 @@ void __init sparse_init(void)
{
unsigned long pnum;
struct page *map;
+ struct page **map_map;
unsigned long *usemap;
unsigned long **usemap_map;
- int size;
+ int size, size2;
int nr_consumed_maps = 0;
-#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
- int size2;
- struct page **map_map;
-#endif

/* see include/linux/mmzone.h 'struct mem_section' definition */
BUILD_BUG_ON(!is_power_of_2(sizeof(struct mem_section)));
@@ -579,7 +559,6 @@ void __init sparse_init(void)
(void *)usemap_map,
sizeof(usemap_map[0]));

-#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
size2 = sizeof(struct page *) * nr_present_sections;
map_map = memblock_virt_alloc(size2, 0);
if (!map_map)
@@ -587,7 +566,6 @@ void __init sparse_init(void)
alloc_usemap_and_memmap(sparse_early_mem_maps_alloc_node,
(void *)map_map,
sizeof(map_map[0]));
-#endif

/* The numner of present sections stored in nr_present_sections
* are kept the same since mem sections are marked as present in
@@ -613,11 +591,7 @@ void __init sparse_init(void)
continue;
}

-#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
map = map_map[nr_consumed_maps];
-#else
- map = sparse_early_mem_map_alloc(pnum);
-#endif
if (!map) {
ms->section_mem_map = 0;
nr_consumed_maps++;
@@ -631,9 +605,7 @@ void __init sparse_init(void)

vmemmap_populate_print_last();

-#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
memblock_free_early(__pa(map_map), size2);
-#endif
memblock_free_early(__pa(usemap_map), size);
}

--
2.13.6