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mm/hugetlb: Allow arch to override and call the weak function 

When running in guest mode ppc64 supports a different mechanism for hugetlb
allocation/reservation. The LPAR management application called HMC can
be used to reserve a set of hugepages and we pass the details of
reserved pages via device tree to the guest. (more details in
htab_dt_scan_hugepage_blocks()) . We do the memblock_reserve of the range
and later in the boot sequence, we add the reserved range to huge_boot_pages.

But to enable 16G hugetlb on baremetal config (when we are not running as guest)
we want to do memblock reservation during boot. Generic code already does this

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2017-07-28 10:31:25 +05:30 committed by Michael Ellerman
parent ca8afd4046
commit e24a1307ba
2 changed files with 4 additions and 1 deletions
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1
include/linux/hugetlb.h
View File

@ -358,6 +358,7 @@ int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
pgoff_t idx);
/* arch callback */
int __init __alloc_bootmem_huge_page(struct hstate *h);
int __init alloc_bootmem_huge_page(struct hstate *h);
void __init hugetlb_bad_size(void);

4
mm/hugetlb.c
View File

@ -2083,7 +2083,9 @@ struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
return page;
}
int __weak alloc_bootmem_huge_page(struct hstate *h)
int alloc_bootmem_huge_page(struct hstate *h)
__attribute__ ((weak, alias("__alloc_bootmem_huge_page")));
int __alloc_bootmem_huge_page(struct hstate *h)
{
struct huge_bootmem_page *m;
int nr_nodes, node;