[lkml]   [2007]   [Jun]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH] MTRR: Fix race causing set_mtrr to go into infinite loop
    On Tuesday 26 June 2007 00:05:17 Chuck Ebbert wrote:
    > On 06/25/2007 05:38 PM, Loic Prylli wrote:
    > [cc: Andi]
    > > Processors synchronization in set_mtrr requires the .gate field
    > > to be set after .count field is properly initialized. Without an explicit
    > > barrier, the compiler was reordering those memory stores. That was sometimes
    > > causing a processor (in ipi_handler) to see the .gate change and
    > > decrement .count before the latter is set by set_mtrr() (which
    > > then hangs in a infinite loop with irqs disabled).

    Hmm, perhaps we should just put the smp_wmb into atomic_set().
    Near all other atomic operations have memory barriers too. I think
    that would be the better fix.

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2007-06-26 00:37    [W:0.025 / U:29.796 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site