cpu_suspend does not flush the L2 cache

[Scott Williams]

In 2.6.39, CPU suspend/resumes crashes if an outer cache controller (like a PL310) is configured and enabled. cpu_suspend only flushes the L1 cache. If an outer cache controller is enabled, the context and saved stack pointer are left sitting in the L2 memory. An attempt to resume a secondary CPU without shutting down the entire CPU complex and flushing the entire L2 cache will cause the secondary CPU to crash because the stack pointer in sleep_save_sp is invalid in L3 memory.

Scott Williams
Sr. Software Engineer
NVIDIA Corporation

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