On Mon, Sep 01, 2014 at 10:34:28AM +0100, Catalin Marinas wrote: > On Mon, Sep 01, 2014 at 04:09:51AM +0100, Leo Yan wrote: > > Now arm64 defers reloading FPSIMD state, but this optimization also > > introduces the bug after cpu resume back from low power mode. > > > > The reason is after the cpu has been powered off, s/w need set the > > cpu's fpsimd_last_state to NULL so that it will force to reload > > FPSIMD state for the thread, otherwise there has the chance to meet > > the condition for both the task's fpsimd_state.cpu field contains the > > id of the current cpu, and the cpu's fpsimd_last_state per-cpu variable > > points to the task's fpsimd_state, so finally kernel will skip to reload > > the context during it return back to userland. > > > > Signed-off-by: Leo Yan <l...@marvell.com> > > Reviewed-by: Catalin Marinas <catalin.mari...@arm.com> > > (and cc'ing Will to pick it up since he's handling the 3.17 release)
Cheers for the CC; applied to fixes/core (I'll push out once I've run the regression tests). I aim to tag that branch tonight if we don't get any more fixes today. Will -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
