[Cluster-devel] [PATCH v7 05/19] iov_iter: Introduce fault_in_iov_iter_writeable

Tony Luck tony.luck at intel.com
Sat Aug 28 22:20:58 UTC 2021

On Sat, Aug 28, 2021 at 3:12 PM Al Viro <viro at zeniv.linux.org.uk> wrote:
> BTW, is #MC triggered on stored to a poisoned cacheline?  Existence of CLZERO
> would seem to argue against that...

No #MC on stores. Just on loads. Note that you can't clear poison
state with a series of small writes to the cache line. But a single
64-byte store might do it (architects didn't want to guarantee that
it would work when I asked about avx512 stores to clear poison
many years ago).


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