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arm64: change PoC D-cache flush to PoU

Will Deacon linux-arm-kernel 1 version New

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  1. v4 Latest0 of 2 patches 0 repliesNew

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Cover letter [PATCH v4 0/2] arm64: change PoC D-cache flush to PoU
Quoted 7 lines · Ashok Kumar

For keeping I and D coherent, dcache flush till PoU(Point of Unification) should be sufficient instead of doing till PoC(Point of coherence). In SoC with more levels of cache, there could be a performance hit in doing flush till PoC as __flush_dcache_area does both flush and invalidate. Introduced new API __clean_dcache_area_pou which does only clean till PoU.

Also deferred dcache flush in __cpu_copy_user_page to __sync_icache_dcache.

Thanks, Ashok. I've queued this locally and will push out once I've given it a good kicking.

Will

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