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mm: introduce memmap_alloc() to unify memory map allocation 

There are several places that allocate memory for the memory map:
alloc_node_mem_map() for FLATMEM, sparse_buffer_init() and
__populate_section_memmap() for SPARSEMEM.

The memory allocated in the FLATMEM case is zeroed and it is never
poisoned, regardless of CONFIG_PAGE_POISON setting.

The memory allocated in the SPARSEMEM cases is not zeroed and it is
implicitly poisoned inside memblock if CONFIG_PAGE_POISON is set.

Introduce memmap_alloc() wrapper for memblock allocators that will be used
for both FLATMEM and SPARSEMEM cases and will makei memory map zeroing and
poisoning consistent for different memory models.

Link: https://lkml.kernel.org/r/20210714123739.16493-4-rppt@kernel.org
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: Michal Simek <monstr@monstr.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Rapoport 2021-09-02 14:58:02 -07:00 committed by Linus Torvalds
parent 22e7878102
commit c803b3c8b3
3 changed files with 28 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
mm/internal.h
View File

@ -211,6 +211,10 @@ extern void zone_pcp_reset(struct zone *zone);
extern void zone_pcp_disable(struct zone *zone);
extern void zone_pcp_enable(struct zone *zone);
extern void *memmap_alloc(phys_addr_t size, phys_addr_t align,
phys_addr_t min_addr,
int nid, bool exact_nid);
#if defined CONFIG_COMPACTION || defined CONFIG_CMA
/*

24
mm/page_alloc.c
View File

@ -6748,6 +6748,26 @@ static void __init memmap_init(void)
init_unavailable_range(hole_pfn, end_pfn, zone_id, nid);
}
void __init *memmap_alloc(phys_addr_t size, phys_addr_t align,
phys_addr_t min_addr, int nid, bool exact_nid)
{
void *ptr;
if (exact_nid)
ptr = memblock_alloc_exact_nid_raw(size, align, min_addr,
MEMBLOCK_ALLOC_ACCESSIBLE,
nid);
else
ptr = memblock_alloc_try_nid_raw(size, align, min_addr,
MEMBLOCK_ALLOC_ACCESSIBLE,
nid);
if (ptr && size > 0)
page_init_poison(ptr, size);
return ptr;
}
static int zone_batchsize(struct zone *zone)
{
#ifdef CONFIG_MMU
@ -7519,8 +7539,8 @@ static void __ref alloc_node_mem_map(struct pglist_data *pgdat)
end = pgdat_end_pfn(pgdat);
end = ALIGN(end, MAX_ORDER_NR_PAGES);
size = (end - start) * sizeof(struct page);
map = memblock_alloc_node(size, SMP_CACHE_BYTES,
pgdat->node_id);
map = memmap_alloc(size, SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT,
pgdat->node_id, false);
if (!map)
panic("Failed to allocate %ld bytes for node %d memory map\n",
size, pgdat->node_id);

6
mm/sparse.c
View File

@ -436,8 +436,7 @@ struct page __init *__populate_section_memmap(unsigned long pfn,
if (map)
return map;
map = memblock_alloc_try_nid_raw(size, size, addr,
MEMBLOCK_ALLOC_ACCESSIBLE, nid);
map = memmap_alloc(size, size, addr, nid, false);
if (!map)
panic("%s: Failed to allocate %lu bytes align=0x%lx nid=%d from=%pa\n",
__func__, size, PAGE_SIZE, nid, &addr);
@ -464,8 +463,7 @@ static void __init sparse_buffer_init(unsigned long size, int nid)
* and we want it to be properly aligned to the section size - this is
* especially the case for VMEMMAP which maps memmap to PMDs
*/
sparsemap_buf = memblock_alloc_exact_nid_raw(size, section_map_size(),
addr, MEMBLOCK_ALLOC_ACCESSIBLE, nid);
sparsemap_buf = memmap_alloc(size, section_map_size(), addr, nid, true);
sparsemap_buf_end = sparsemap_buf + size;
}