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    Subject[PATCH v21 058/100] c/r: (s390): expose a constant for the number of words (CRs)
    Date
    We need to use this value in the checkpoint/restart code and would like to
    have a constant instead of a magic '3'.

    Changelog:
    Jan 20:
    . Define s390x sys_restart wrapper
    Mar 30:
    . Add CHECKPOINT_SUPPORT in Kconfig (Nathan Lynch)
    Mar 03:
    . Picked up additional use of magic '3' in ptrace.h

    Cc: linux-s390@vger.kernel.org
    Signed-off-by: Dan Smith <danms@us.ibm.com>
    Acked-by: Serge E. Hallyn <serue@us.ibm.com>
    Tested-by: Serge E. Hallyn <serue@us.ibm.com>
    ---
    arch/s390/Kconfig | 4 ++++
    arch/s390/kernel/process.c | 8 ++++++++
    2 files changed, 12 insertions(+), 0 deletions(-)

    diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
    index 0d8cd9b..b358e63 100644
    --- a/arch/s390/Kconfig
    +++ b/arch/s390/Kconfig
    @@ -49,6 +49,10 @@ config GENERIC_TIME_VSYSCALL
    config GENERIC_CLOCKEVENTS
    def_bool y

    +config CHECKPOINT_SUPPORT
    + bool
    + default y if 64BIT
    +
    config GENERIC_BUG
    bool
    depends on BUG
    diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
    index 799cbb0..15f5719 100644
    --- a/arch/s390/kernel/process.c
    +++ b/arch/s390/kernel/process.c
    @@ -240,6 +240,14 @@ SYSCALL_DEFINE4(clone, unsigned long, newsp, unsigned long, clone_flags,
    parent_tidptr, child_tidptr);
    }

    +#ifdef CONFIG_CHECKPOINT
    +SYSCALL_DEFINE4(restart, pid_t, pid, int, fd, unsigned long, flags,
    + int, logfd)
    +{
    + return do_sys_restart(pid, fd, flags, logfd);
    +}
    +#endif
    +
    SYSCALL_DEFINE4(eclone, unsigned int, flags_low, struct clone_args __user *,
    uca, int, args_size, pid_t __user *, pids)
    {
    --
    1.6.3.3


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