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[PW_SID:995335] update kernel-doc for MEMBLOCK_RSRV_NOINIT (was: Re: [PATCH RFC 10/35] mm/hugetlb: cleanup hugetlb_folio_init_tail_vmemmap()) #833

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[PW_SID:995335] update kernel-doc for MEMBLOCK_RSRV_NOINIT (was: Re: [PATCH RFC 10/35] mm/hugetlb: cleanup hugetlb_folio_init_tail_vmemmap()) #833

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5 changes: 3 additions & 2 deletions include/linux/memblock.h
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Original file line number Diff line number Diff line change
Expand Up @@ -40,8 +40,9 @@ extern unsigned long long max_possible_pfn;
* via a driver, and never indicated in the firmware-provided memory map as
* system RAM. This corresponds to IORESOURCE_SYSRAM_DRIVER_MANAGED in the
* kernel resource tree.
* @MEMBLOCK_RSRV_NOINIT: memory region for which struct pages are
* not initialized (only for reserved regions).
* @MEMBLOCK_RSRV_NOINIT: reserved memory region for which struct pages are not
* fully initialized. Users of this flag are responsible to properly initialize
* struct pages of this region
* @MEMBLOCK_RSRV_KERN: memory region that is reserved for kernel use,
* either explictitly with memblock_reserve_kern() or via memblock
* allocation APIs. All memblock allocations set this flag.
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15 changes: 11 additions & 4 deletions mm/memblock.c
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Expand Up @@ -1091,13 +1091,20 @@ int __init_memblock memblock_clear_nomap(phys_addr_t base, phys_addr_t size)

/**
* memblock_reserved_mark_noinit - Mark a reserved memory region with flag
* MEMBLOCK_RSRV_NOINIT which results in the struct pages not being initialized
* for this region.
* MEMBLOCK_RSRV_NOINIT
*
* @base: the base phys addr of the region
* @size: the size of the region
*
* struct pages will not be initialized for reserved memory regions marked with
* %MEMBLOCK_RSRV_NOINIT.
* The struct pages for the reserved regions marked %MEMBLOCK_RSRV_NOINIT will
* not be fully initialized to allow the caller optimize their initialization.
*
* When %CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled, setting this flag
* completely bypasses the initialization of struct pages for such region.
*
* When %CONFIG_DEFERRED_STRUCT_PAGE_INIT is disabled, struct pages in this
* region will be initialized with default values but won't be marked as
* reserved.
*
* Return: 0 on success, -errno on failure.
*/
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