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arch: arm: restrict IRQ lock to minimum during pendSV exception
When performing thread context-switch it is not necessary to have IRQs locked while saving the current thread's callee-saved (and possibly floating point) registers. We only need to lock the interrupts when accessing the thread ready queue cache. Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
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