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mm/huge_memory.c: use head to emphasize the purpose of page

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During split huge page, it checks the property of the page.  Currently
we do the check on page and head without emphasizing the check is on the
compound page.  In case the page passed to split_huge_page_to_list is a
tail page, audience would take some time to think about whether the
check is on compound page or tail page itself.

To make it explicit, use head instead of page for those checks.  After
this, audience would be more clear about the checks are on compound page
and the page is used to do the split and dump error message if failed.

Link: http://lkml.kernel.org/r/20200110032610.26499-2-richardw.yang@linux.intel.com
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wei Yang 2020-01-30 22:14:32 -08:00 committed by Linus Torvalds
parent cb82962486
commit a8803e6c17
1 changed files with 8 additions and 8 deletions
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16
mm/huge_memory.c
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@ -2704,7 +2704,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
{
struct page *head = compound_head(page);
struct pglist_data *pgdata = NODE_DATA(page_to_nid(head));
struct deferred_split *ds_queue = get_deferred_split_queue(page);
struct deferred_split *ds_queue = get_deferred_split_queue(head);
struct anon_vma *anon_vma = NULL;
struct address_space *mapping = NULL;
int count, mapcount, extra_pins, ret;
@ -2713,10 +2713,10 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
pgoff_t end;
VM_BUG_ON_PAGE(is_huge_zero_page(head), head);
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_PAGE(!PageCompound(page), page);
VM_BUG_ON_PAGE(!PageLocked(head), head);
VM_BUG_ON_PAGE(!PageCompound(head), head);
if (PageWriteback(page))
if (PageWriteback(head))
return -EBUSY;
if (PageAnon(head)) {
@ -2767,7 +2767,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
goto out_unlock;
}
mlocked = PageMlocked(page);
mlocked = PageMlocked(head);
unmap_page(head);
VM_BUG_ON_PAGE(compound_mapcount(head), head);
@ -2800,10 +2800,10 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
list_del(page_deferred_list(head));
}
if (mapping) {
if (PageSwapBacked(page))
__dec_node_page_state(page, NR_SHMEM_THPS);
if (PageSwapBacked(head))
__dec_node_page_state(head, NR_SHMEM_THPS);
else
__dec_node_page_state(page, NR_FILE_THPS);
__dec_node_page_state(head, NR_FILE_THPS);
}
spin_unlock(&ds_queue->split_queue_lock);