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The driver API was meant to operate even in scenarios where interrupts are kept permanently disabled and all I/O happens via polling, e.g. RedBoot. It reduces the effort needed inside device drivers to cope
Application code is much less likely to suffer from confusion because the choice of whether or not to use the kernel usually gets made very early in the application design phase.
The functions in this patch will only work in scenarios are kept
enabled most or all of the time, which won't be the case in e.g.
RedBoot.
have such functions in the system.
thanks Jani
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