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| author |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-25 21:25:02 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-25 21:25:02 -0800 |
| commit | 8f5f90a872c38b4e78f3cc95e8a25434b98e4db2 (patch) | |
| tree | 36c50b0c97286ab89c85016f7ab281f8e843c05c /mm/migrate.c | |
| parent | staging: comedi: addi_watchdog: all i/o registers are 32-bit (diff) | |
| parent | Linux 3.8-rc5 (diff) | |
| download | linux-dev-8f5f90a872c38b4e78f3cc95e8a25434b98e4db2.tar.xz linux-dev-8f5f90a872c38b4e78f3cc95e8a25434b98e4db2.zip | |
Merge 3.8-rc5 into staging-next
This resolves a merge issue with a iio driver, and the zram code.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/migrate.c')
| -rw-r--r-- | mm/migrate.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 3b676b0c5c3e..c38778610aa8 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1679,9 +1679,21 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, page_xchg_last_nid(new_page, page_last_nid(page)); isolated = numamigrate_isolate_page(pgdat, page); - if (!isolated) { + + /* + * Failing to isolate or a GUP pin prevents migration. The expected + * page count is 2. 1 for anonymous pages without a mapping and 1 + * for the callers pin. If the page was isolated, the page will + * need to be put back on the LRU. + */ + if (!isolated || page_count(page) != 2) { count_vm_events(PGMIGRATE_FAIL, HPAGE_PMD_NR); put_page(new_page); + if (isolated) { + putback_lru_page(page); + isolated = 0; + goto out; + } goto out_keep_locked; } |