[lkml]   [2011]   [Jan]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: Bug#609371: linux-image-2.6.37-trunk-sparc64: module scsi_mod: Unknown relocation: 36
    * Steven Rostedt ( wrote:
    > On Wed, 2011-01-19 at 13:40 -0800, David Miller wrote:
    > > My concern is that if there is ever a u64 or similarly "long long"
    > > typed member in these tracing structures, it will not be aligned
    > > sufficiently to avoid unaligned access traps on 32-bit systems.
    > The structure that gets placed in this section is the ftrace_event_call.
    > It consists only of pointers, a struct list_head, a couple of "int", and
    > a struct trace_event, which consists of: a struct hlist_node, a struct
    > list_head, an int, and a pointer.
    > None of these are more than "long" and I don't foresee them needing a
    > long long type. I think assuming that a long is the largest item should
    > due.
    > We can add a comment next to these structures specifying this
    > dependency, and hopefully it would be updated if we ever do include a
    > long long in them.

    I still wonder how a 32-bit system can generate an unaligned access trap for an
    access to a 64-bit variable aligned on 32-bit, given that there is, by
    definition, no 64-bit memory accesses available on the architecture ?


    Mathieu Desnoyers
    Operating System Efficiency R&D Consultant
    EfficiOS Inc.

     \ /
      Last update: 2011-01-19 23:25    [W:0.021 / U:127.532 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site