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memblock: update initialization of reserved pages 

The struct pages representing a reserved memory region are initialized
using reserve_bootmem_range() function.  This function is called for each
reserved region just before the memory is freed from memblock to the buddy
page allocator.

The struct pages for MEMBLOCK_NOMAP regions are kept with the default
values set by the memory map initialization which makes it necessary to
have a special treatment for such pages in pfn_valid() and
pfn_valid_within().

Split out initialization of the reserved pages to a function with a
meaningful name and treat the MEMBLOCK_NOMAP regions the same way as the
reserved regions and mark struct pages for the NOMAP regions as
PageReserved.

Link: https://lkml.kernel.org/r/20210511100550.28178-3-rppt@kernel.org
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
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 2021-06-30 18:51:16 -07:00 committed by Linus Torvalds
parent 51c656aef6
commit 9092d4f7a1
2 changed files with 29 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/memblock.h
View File

@ -30,7 +30,9 @@ extern unsigned long long max_possible_pfn;
* @MEMBLOCK_NONE: no special request
* @MEMBLOCK_HOTPLUG: hotpluggable region
* @MEMBLOCK_MIRROR: mirrored region
* @MEMBLOCK_NOMAP: don't add to kernel direct mapping
* @MEMBLOCK_NOMAP: don't add to kernel direct mapping and treat as
* reserved in the memory map; refer to memblock_mark_nomap() description
* for further details
*/
enum memblock_flags {
MEMBLOCK_NONE = 0x0, /* No special request */

28
mm/memblock.c
View File

@ -906,6 +906,11 @@ int __init_memblock memblock_mark_mirror(phys_addr_t base, phys_addr_t size)
* @base: the base phys addr of the region
* @size: the size of the region
*
* The memory regions marked with %MEMBLOCK_NOMAP will not be added to the
* direct mapping of the physical memory. These regions will still be
* covered by the memory map. The struct page representing NOMAP memory
* frames in the memory map will be PageReserved()
*
* Return: 0 on success, -errno on failure.
*/
int __init_memblock memblock_mark_nomap(phys_addr_t base, phys_addr_t size)
@ -2002,6 +2007,26 @@ static unsigned long __init __free_memory_core(phys_addr_t start,
return end_pfn - start_pfn;
}
static void __init memmap_init_reserved_pages(void)
{
struct memblock_region *region;
phys_addr_t start, end;
u64 i;
/* initialize struct pages for the reserved regions */
for_each_reserved_mem_range(i, &start, &end)
reserve_bootmem_region(start, end);
/* and also treat struct pages for the NOMAP regions as PageReserved */
for_each_mem_region(region) {
if (memblock_is_nomap(region)) {
start = region->base;
end = start + region->size;
reserve_bootmem_region(start, end);
}
}
}
static unsigned long __init free_low_memory_core_early(void)
{
unsigned long count = 0;
@ -2010,8 +2035,7 @@ static unsigned long __init free_low_memory_core_early(void)
memblock_clear_hotplug(0, -1);
for_each_reserved_mem_range(i, &start, &end)
reserve_bootmem_region(start, end);
memmap_init_reserved_pages();
/*
* We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id