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Code Issues Releases Wiki Activity

huge tmpfs: move shmem_huge_enabled() upwards 

shmem_huge_enabled() is about to be enhanced into shmem_is_huge(), so that
it can be used more widely throughout: before making functional changes,
shift it to its final position (to avoid forward declaration).

Link: https://lkml.kernel.org/r/16fec7b7-5c84-415a-8586-69d8bf6a6685@google.com
Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2021-09-02 14:54:31 -07:00 committed by Linus Torvalds
parent b9e2faaf6f
commit c852023e6f
1 changed files with 35 additions and 37 deletions
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72
mm/shmem.c
View File

@ -473,6 +473,41 @@ static bool shmem_confirm_swap(struct address_space *mapping,
static int shmem_huge __read_mostly;
bool shmem_huge_enabled(struct vm_area_struct *vma)
{
struct inode *inode = file_inode(vma->vm_file);
struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
loff_t i_size;
pgoff_t off;
if ((vma->vm_flags & VM_NOHUGEPAGE) ||
test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
return false;
if (shmem_huge == SHMEM_HUGE_FORCE)
return true;
if (shmem_huge == SHMEM_HUGE_DENY)
return false;
switch (sbinfo->huge) {
case SHMEM_HUGE_NEVER:
return false;
case SHMEM_HUGE_ALWAYS:
return true;
case SHMEM_HUGE_WITHIN_SIZE:
off = round_up(vma->vm_pgoff, HPAGE_PMD_NR);
i_size = round_up(i_size_read(inode), PAGE_SIZE);
if (i_size >= HPAGE_PMD_SIZE &&
i_size >> PAGE_SHIFT >= off)
return true;
fallthrough;
case SHMEM_HUGE_ADVISE:
/* TODO: implement fadvise() hints */
return (vma->vm_flags & VM_HUGEPAGE);
default:
VM_BUG_ON(1);
return false;
}
}
#if defined(CONFIG_SYSFS)
static int shmem_parse_huge(const char *str)
{
@ -3979,43 +4014,6 @@ struct kobj_attribute shmem_enabled_attr =
__ATTR(shmem_enabled, 0644, shmem_enabled_show, shmem_enabled_store);
#endif /* CONFIG_TRANSPARENT_HUGEPAGE && CONFIG_SYSFS */
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
bool shmem_huge_enabled(struct vm_area_struct *vma)
{
struct inode *inode = file_inode(vma->vm_file);
struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
loff_t i_size;
pgoff_t off;
if ((vma->vm_flags & VM_NOHUGEPAGE) ||
test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
return false;
if (shmem_huge == SHMEM_HUGE_FORCE)
return true;
if (shmem_huge == SHMEM_HUGE_DENY)
return false;
switch (sbinfo->huge) {
case SHMEM_HUGE_NEVER:
return false;
case SHMEM_HUGE_ALWAYS:
return true;
case SHMEM_HUGE_WITHIN_SIZE:
off = round_up(vma->vm_pgoff, HPAGE_PMD_NR);
i_size = round_up(i_size_read(inode), PAGE_SIZE);
if (i_size >= HPAGE_PMD_SIZE &&
i_size >> PAGE_SHIFT >= off)
return true;
fallthrough;
case SHMEM_HUGE_ADVISE:
/* TODO: implement fadvise() hints */
return (vma->vm_flags & VM_HUGEPAGE);
default:
VM_BUG_ON(1);
return false;
}
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#else /* !CONFIG_SHMEM */
/*