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arch: arm: introduce macro to describe the privilege stack alignment
We introduce a new define to describe the alignment for a privilege stack buffer. This macro definition is used by the privilege stack generation script, to determine the required alignment of threads' privilege stacks when building with support for user mode. We cannot use Z_THREAD_MIN_STACK_ALIGN in this case, because the privilege stacks do not need to respect the minimum MPU region alignment requirement, unless, of course, this is enforced via the MPU Stack Guard feature. Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
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