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When invalidating the instruction cache for a kernel mapping via flush_icache_range(), it is also necessary to flush the pipeline for other CPUs so that instructions fetched into the pipeline before the I-cache invalidation are discarded. For example, if module 'foo' is unloaded and then module 'bar' is loaded into the same area of memory, a CPU could end up executing instructions from 'foo' when branching into 'bar' if these instructions were fetched into the pipeline before 'foo' was unloaded. Whilst this is highly unlikely to occur in practice, particularly as any exception acts as a context-synchronizing operation, following the letter of the architecture requires us to execute an ISB on each CPU in order for the new instruction stream to be visible. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> |
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