lkml.org 
[lkml]   [2006]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: [openib-general] ipoib lockdep warning
    From
    Date
     > > So, ugh... maybe the best thing to do is change lib/idr.c to use
    > > spin_lock_irqsave() internally?
    >
    > I dunno, it seems to have had _irq() locking in the past? From the
    > comment at the top:
    >
    > * Modified by George Anzinger to reuse immediately and to use
    > * find bit instructions. Also removed _irq on spinlocks.

    Well, _irq would be no good, because we might want to call idr stuff
    with interrupts disabled. But making idr internally _irqsave seems
    like the right fix to me.

    I think the real issue here is that the sa_query.c stuff wants to use
    the idr mechanism to assign "query ids", and other modules want to be
    able to start queries from any context. So if idr uses bare spin_lock
    internally, then sa_query.c has no choice but to wrap all idr calls
    inside spin_lock_irqsave and do all allocation with GFP_ATOMIC, which
    doesn't seem very nice.

    - R.
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2006-07-12 02:09    [W:4.398 / U:0.144 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site