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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2016-01-21 16:40:25 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-21 17:20:51 -0800 |
| commit | b6ec57f4b92e9bae4617f7d98a054d45370284bb (patch) | |
| tree | 31b894dc2fa7c8a885baa4be7094c73002999719 /mm/memcontrol.c | |
| parent | 404a47410c26a115123885977053e9a1a4460929 (diff) | |
| download | lwn-b6ec57f4b92e9bae4617f7d98a054d45370284bb.tar.gz lwn-b6ec57f4b92e9bae4617f7d98a054d45370284bb.zip | |
thp: change pmd_trans_huge_lock() interface to return ptl
After THP refcounting rework we have only two possible return values
from pmd_trans_huge_lock(): success and failure. Return-by-pointer for
ptl doesn't make much sense in this case.
Let's convert pmd_trans_huge_lock() to return ptl on success and NULL on
failure.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Minchan Kim <minchan@kernel.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index ca052f2a4a0b..d06cae2de783 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -4638,7 +4638,8 @@ static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd, pte_t *pte; spinlock_t *ptl; - if (pmd_trans_huge_lock(pmd, vma, &ptl)) { + ptl = pmd_trans_huge_lock(pmd, vma); + if (ptl) { if (get_mctgt_type_thp(vma, addr, *pmd, NULL) == MC_TARGET_PAGE) mc.precharge += HPAGE_PMD_NR; spin_unlock(ptl); @@ -4826,7 +4827,8 @@ static int mem_cgroup_move_charge_pte_range(pmd_t *pmd, union mc_target target; struct page *page; - if (pmd_trans_huge_lock(pmd, vma, &ptl)) { + ptl = pmd_trans_huge_lock(pmd, vma); + if (ptl) { if (mc.precharge < HPAGE_PMD_NR) { spin_unlock(ptl); return 0; |