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    SubjectRe: Thread flags modified without set_thread_flag() (non atomically)
    [trimming cc list since I'm only replying to the avr32 part]

    On Wed, 28 Feb 2007 22:03:49 -0800
    Andrew Morton <akpm@linux-foundation.org> wrote:

    > On Mon, 26 Feb 2007 12:10:37 -0800 Mathieu Desnoyers <compudj@google.com> wrote:

    > > avr32/kernel/ptrace.c: ti->flags |= _TIF_BREAKPOINT;
    >
    > No, I don't immediately see anything in the flush_old_exec() code path
    > which tells us that nobody else can look up this thread_info (or be holding
    > a ref to it) in this context.
    >
    >
    > > avr32/kernel/ptrace.c: ti->flags |= TIF_SINGLE_STEP;
    >
    > heh. Haarvard, you got a bug.

    Heh, yeah. That would indeed explain some strange gdb behaviour. It
    will only trigger when single-stepping into an exception or interrupt
    handler so thanks for pointing it out; I would have had a hard time
    figuring it out on my own...

    I don't think either of those need to be atomic though, since both of
    them happen in monitor mode with interrupts disabled.

    Haavard
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