[lkml]   [2003]   [Apr]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [BUG] 2.5.65: Caching MSR_IA32_SYSENTER_CS kills dosemu

    On 1 Apr 2003, Robert Love wrote:
    > Actually, do they do disable preemption - if they do not, something is
    > broken.

    Ok, I was too lazy to check. Anyway, the test-patch is worth trying, since
    one of the areas fixed had no pre-emption protection regardless (ie it
    used just a plain "smp_processor_id()"), and the patch should be
    technically equivalent (just uglier) to a proper get_cpu().

    > Because, even on UP, preemption can lead to a race over a variable that
    > has no locking because its per-CPU. But it would need locking
    > otherwise, and thus we do need to disable preemption.

    Yes, that was certainly the case here.


    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: 2005-03-22 13:34    [W:0.019 / U:3.816 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site