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    SubjectRe: Deadlock on the mm->mmap_sem
    > if we go generic then I strongly recommend my version of the generic
    > semaphores is _much_ faster (and cleaner) than this one

    Not so:-) Your patch, Andrea, grabs the spinlock far more than is necessary.

    > (it even allows more than 2^31 concurrent readers on 64 bit archs ;).

    Easy enough to fix. Just apply this as well:

    --- linux-rwsem-old/include/linux/rwsem.h Wed Sep 19 19:23:44 2001
    +++ linux-rwsem/include/linux/rwsem.h Wed Sep 19 19:23:47 2001
    @@ -26,7 +26,7 @@
    * - if wait_list is not empty, then there are processes waiting for the semaphore
    struct rw_semaphore {
    - int activity;
    + long activity;
    spinlock_t lock;
    struct list_head wait_list;
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