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Rationale: make LITMUS^RT ops available in a way that does not create
merge conflicts each time we rebase LITMUS^RT on top of a new kernel
version. This also helps with portability to different architectures,
as we no longer need to patch each architecture's syscall table.
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This patch modifies the previous implementation of hrtimer_start_on() by
now using smp_call_function_single_async() to arm hrtimers on remote
CPU's.
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This patch adds the core of LITMUS^RT:
- library functionality (heaps, rt_domain, prioritization, etc.)
- budget enforcement logic
- job management
- system call backends
- virtual devices (control page, etc.)
- scheduler plugin API (and dummy plugin)
This code compiles, but is not yet integrated with the rest of Linux.
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This patch adds a basic litmus/litmus.h, which is required for basic
LITMUS^RT infrastructure to compile.
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