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    Subject[PATCH 07/10] mm/memory-failure: share the i_mmap_rwsem
    Date
    No brainer conversion: collect_procs_file() only schedules
    a process for later kill, share the lock, similarly to
    the anon vma variant.

    Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
    Acked-by: Kirill A. Shutemov <kirill.shutemov@intel.linux.com>
    ---
    mm/memory-failure.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    diff --git a/mm/memory-failure.c b/mm/memory-failure.c
    index e1646fe..e619625 100644
    --- a/mm/memory-failure.c
    +++ b/mm/memory-failure.c
    @@ -466,7 +466,7 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill,
    struct task_struct *tsk;
    struct address_space *mapping = page->mapping;

    - i_mmap_lock_write(mapping);
    + i_mmap_lock_read(mapping);
    read_lock(&tasklist_lock);
    for_each_process(tsk) {
    pgoff_t pgoff = page_to_pgoff(page);
    @@ -488,7 +488,7 @@ static void collect_procs_file(struct page *page, struct list_head *to_kill,
    }
    }
    read_unlock(&tasklist_lock);
    - i_mmap_unlock_write(mapping);
    + i_mmap_unlock_read(mapping);
    }

    /*
    --
    1.8.4.5


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