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    SubjectRe: rcu warnings cause stack overflow
    On Wed, Feb 01, 2012 at 04:14:48PM +0100, Frederic Weisbecker wrote:
    > > Removing the WARN_ON_ONCE will fix this and, if lockdep is turned on, still
    > > will find illegal uses. But it won't work for lockdep off configs...
    > > So we probably want something better than the patch below.
    > Ah ok. Hmm, but why are you using an exception to implement WARN_ON()
    > in s390? Is it to have a whole new stack for the warning path in order
    > to avoid stack overflow from the place that called the WARN_ON() ?

    The reason was to reduce the code footprint of the WARN_ON() and also
    be able to print the register contents at the time the warning happened.

    All architectures which define __WARN_TAINT implement warnings with
    exceptions. Currently that are parisc, powerpc, s390 and sh.

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      Last update: 2012-02-02 13:31    [W:0.020 / U:114.980 seconds]
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