p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

arm64: hugetlb: Register hugepages during arch init 

Add hstate for each supported hugepage size using arch initcall.

* no hugepage parameters

  Without hugepage parameters, only a default hugepage size is
  available for dynamic allocation.  It's different, for example, from
  x86_64 and sparc64 where all supported hugepage sizes are available.

* only default_hugepagesz= is specified and set not to HPAGE_SIZE

  In spite of the fact that default_hugepagesz= is set to a valid
  hugepage size, it's treated as unsupported and reverted to
  HPAGE_SIZE.  Such behaviour is also different from x86_64 and
  sparc64.

Acked-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Tom Saeger <tom.saeger@oracle.com>
Signed-off-by: Dmitry Klochkov <dmitry.klochkov@oracle.com>
Signed-off-by: Allen Pais <allen.pais@oracle.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Allen Pais 2018-10-23 06:36:57 +05:30 committed by Will Deacon
parent cc9f8349cb
commit a21b0b78ea
1 changed files with 22 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
arch/arm64/mm/hugetlbpage.c
View File

@ -429,6 +429,27 @@ void huge_ptep_clear_flush(struct vm_area_struct *vma,
clear_flush(vma->vm_mm, addr, ptep, pgsize, ncontig);
}
static void __init add_huge_page_size(unsigned long size)
{
if (size_to_hstate(size))
return;
hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT);
}
static int __init hugetlbpage_init(void)
{
#ifdef CONFIG_ARM64_4K_PAGES
add_huge_page_size(PUD_SIZE);
#endif
add_huge_page_size(PMD_SIZE * CONT_PMDS);
add_huge_page_size(PMD_SIZE);
add_huge_page_size(PAGE_SIZE * CONT_PTES);
return 0;
}
arch_initcall(hugetlbpage_init);
static __init int setup_hugepagesz(char *opt)
{
unsigned long ps = memparse(opt, &opt);
@ -440,7 +461,7 @@ static __init int setup_hugepagesz(char *opt)
case PMD_SIZE * CONT_PMDS:
case PMD_SIZE:
case PAGE_SIZE * CONT_PTES:
hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT);
add_huge_page_size(ps);
return 1;
}
@ -449,13 +470,3 @@ static __init int setup_hugepagesz(char *opt)
return 0;
}
__setup("hugepagesz=", setup_hugepagesz);
#ifdef CONFIG_ARM64_64K_PAGES
static __init int add_default_hugepagesz(void)
{
if (size_to_hstate(CONT_PTES * PAGE_SIZE) == NULL)
hugetlb_add_hstate(CONT_PTE_SHIFT);
return 0;
}
arch_initcall(add_default_hugepagesz);
#endif