• Ingo Molnar's avatar
    timers: add mod_timer_pending() · 74019224
    Ingo Molnar authored
    Impact: new timer API
    
    Based on an idea from Martin Josefsson with the help of
    Patrick McHardy and Stephen Hemminger:
    
    introduce the mod_timer_pending() API which is a mod_timer()
    offspring that is an invariant on already removed timers.
    
    (regular mod_timer() re-activates non-pending timers.)
    
    This is useful for the networking code in that it can
    allow unserialized mod_timer_pending() timer-forwarding
    calls, but a single del_timer*() will stop the timer
    from being reactivated again.
    
    Also while at it:
    
    - optimize the regular mod_timer() path some more, the
      timer-stat and a debug check was needlessly duplicated
      in __mod_timer().
    
    - make the exports come straight after the function, as
      most other exports in timer.c already did.
    
    - eliminate __mod_timer() as an external API, change the
      users to mod_timer().
    
    The regular mod_timer() code path is not impacted
    significantly, due to inlining optimizations and due to
    the simplifications.
    
    Based-on-patch-from: Stephen Hemminger <shemminger@vyatta.com>
    Acked-by: default avatarStephen Hemminger <shemminger@vyatta.com>
    Cc: "David S. Miller" <davem@davemloft.net>
    Cc: Patrick McHardy <kaber@trash.net>
    Cc: netdev@vger.kernel.org
    Cc: Oleg Nesterov <oleg@redhat.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    74019224
sched.c 29.5 KB