[PATCH 2/5] proc: use down_read_killable for /proc/pid/smaps_rollup

[Konstantin Khlebnikov]

Ditto.

Signed-off-by: Konstantin Khlebnikov <khlebni...@yandex-team.ru>
---
 fs/proc/task_mmu.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 2bf210229daf..781879a91e3b 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -832,7 +832,10 @@ static int show_smaps_rollup(struct seq_file *m, void *v)
 
        memset(&mss, 0, sizeof(mss));
 
-       down_read(&mm->mmap_sem);
+       ret = down_read_killable(&mm->mmap_sem);
+       if (ret)
+               goto out_put_mm;
+
        hold_task_mempolicy(priv);
 
        for (vma = priv->mm->mmap; vma; vma = vma->vm_next) {
@@ -849,8 +852,9 @@ static int show_smaps_rollup(struct seq_file *m, void *v)
 
        release_task_mempolicy(priv);
        up_read(&mm->mmap_sem);
-       mmput(mm);
 
+out_put_mm:
+       mmput(mm);
 out_put_task:
        put_task_struct(priv->task);
        priv->task = NULL;