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    Subject[RFC v16][PATCH 20/43] c/r: export functionality used in next patch for restart-blocks
    Date
    To support c/r of restart-blocks (system call that need to be
    restarted because they were interrupted but there was no userspace
    visible side-effect), export restart-block callbacks for poll()
    and futex() syscalls.

    More details on c/r of restart-blocks and how it works in the
    following patch.

    Signed-off-by: Oren Laadan <orenl@cs.columbia.edu>
    Acked-by: Serge Hallyn <serue@us.ibm.com>
    ---
    fs/select.c | 2 +-
    include/linux/futex.h | 10 ++++++++++
    include/linux/poll.h | 3 +++
    include/linux/posix-timers.h | 2 ++
    kernel/futex.c | 11 +----------
    kernel/posix-timers.c | 2 +-
    6 files changed, 18 insertions(+), 12 deletions(-)

    diff --git a/fs/select.c b/fs/select.c
    index 0fe0e14..e64ddc6 100644
    --- a/fs/select.c
    +++ b/fs/select.c
    @@ -833,7 +833,7 @@ out_fds:
    return err;
    }

    -static long do_restart_poll(struct restart_block *restart_block)
    +long do_restart_poll(struct restart_block *restart_block)
    {
    struct pollfd __user *ufds = restart_block->poll.ufds;
    int nfds = restart_block->poll.nfds;
    diff --git a/include/linux/futex.h b/include/linux/futex.h
    index 3bf5bb5..dd0e06b 100644
    --- a/include/linux/futex.h
    +++ b/include/linux/futex.h
    @@ -130,6 +130,16 @@ extern int
    handle_futex_death(u32 __user *uaddr, struct task_struct *curr, int pi);

    /*
    + * In case we must use restart_block to restart a futex_wait,
    + * we encode in the 'flags' shared capability
    + */
    +#define FLAGS_SHARED 0x01
    +#define FLAGS_CLOCKRT 0x02
    +
    +/* referenced by checkpoint/restart */
    +extern long futex_wait_restart(struct restart_block *restart);
    +
    +/*
    * Futexes are matched on equal values of this key.
    * The key type depends on whether it's a shared or private mapping.
    * Don't rearrange members without looking at hash_futex().
    diff --git a/include/linux/poll.h b/include/linux/poll.h
    index 8c24ef8..97f95a7 100644
    --- a/include/linux/poll.h
    +++ b/include/linux/poll.h
    @@ -131,6 +131,9 @@ extern int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,

    extern int poll_select_set_timeout(struct timespec *to, long sec, long nsec);

    +/* used by checkpoint/restart */
    +extern long do_restart_poll(struct restart_block *restart_block);
    +
    #endif /* KERNEL */

    #endif /* _LINUX_POLL_H */
    diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
    index 4f71bf4..3d0e946 100644
    --- a/include/linux/posix-timers.h
    +++ b/include/linux/posix-timers.h
    @@ -119,4 +119,6 @@ long clock_nanosleep_restart(struct restart_block *restart_block);

    void update_rlimit_cpu(unsigned long rlim_new);

    +int invalid_clockid(const clockid_t which_clock);
    +
    #endif
    diff --git a/kernel/futex.c b/kernel/futex.c
    index d546b2d..f405c73 100644
    --- a/kernel/futex.c
    +++ b/kernel/futex.c
    @@ -1113,15 +1113,6 @@ handle_fault:
    goto retry;
    }

    -/*
    - * In case we must use restart_block to restart a futex_wait,
    - * we encode in the 'flags' shared capability
    - */
    -#define FLAGS_SHARED 0x01
    -#define FLAGS_CLOCKRT 0x02
    -
    -static long futex_wait_restart(struct restart_block *restart);
    -
    static int futex_wait(u32 __user *uaddr, int fshared,
    u32 val, ktime_t *abs_time, u32 bitset, int clockrt)
    {
    @@ -1286,7 +1277,7 @@ out:
    }


    -static long futex_wait_restart(struct restart_block *restart)
    +long futex_wait_restart(struct restart_block *restart)
    {
    u32 __user *uaddr = (u32 __user *)restart->futex.uaddr;
    int fshared = 0;
    diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
    index 052ec4d..589aed2 100644
    --- a/kernel/posix-timers.c
    +++ b/kernel/posix-timers.c
    @@ -205,7 +205,7 @@ static int no_timer_create(struct k_itimer *new_timer)
    /*
    * Return nonzero if we know a priori this clockid_t value is bogus.
    */
    -static inline int invalid_clockid(const clockid_t which_clock)
    +int invalid_clockid(const clockid_t which_clock)
    {
    if (which_clock < 0) /* CPU clock, posix_cpu_* will check it */
    return 0;
    --
    1.6.0.4


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