diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2016-01-15 16:51:24 -0800 |
|---|---|---|
| committer | Vinayak Menon <vinmenon@codeaurora.org> | 2018-10-01 14:31:29 +0530 |
| commit | 20e044155fa7414194e0fd02bb37969b7a0cc546 (patch) | |
| tree | 9f952235cd45358e700c1ad4d972f742cfa4a251 /mm/migrate.c | |
| parent | ed4ab1535633e4db6e45e685593a31031eb1b025 (diff) | |
page-flags: define PG_locked behavior on compound pages
lock_page() must operate on the whole compound page. It doesn't make
much sense to lock part of compound page. Change code to use head
page's PG_locked, if tail page is passed.
This patch also gets rid of custom helper functions --
__set_page_locked() and __clear_page_locked(). They are replaced with
helpers generated by __SETPAGEFLAG/__CLEARPAGEFLAG. Tail pages to these
helper would trigger VM_BUG_ON().
SLUB uses PG_locked as a bit spin locked. IIUC, tail pages should never
appear there. VM_BUG_ON() is added to make sure that this assumption is
correct.
[akpm@linux-foundation.org: fix fs/cifs/file.c]
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Steve Capper <steve.capper@linaro.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Change-Id: Ifeeb98c789880ff34b286383568db60e08672205
Git-Commit: 48c935ad88f5be20eb5445a77c171351b1eb5111
Git-Repo: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
Diffstat (limited to 'mm/migrate.c')
| -rw-r--r-- | mm/migrate.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 921cf12b03ce..879aabed46bb 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1936,7 +1936,7 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, flush_tlb_range(vma, mmun_start, mmun_end); /* Prepare a page as a migration target */ - __set_page_locked(new_page); + __SetPageLocked(new_page); SetPageSwapBacked(new_page); /* anon mapping, we can simply copy page->mapping to the new page: */ |