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Ps2sEgUJA29lBhFCqBa7XjOKUi6lGTZafW8kE3Bo+2rn8p37FTMTvvB9KiAaW121mMD/ocrUPdg8+5Cf5EneuHXo029mKyb6vDG9w3AyGgFCcBXGsJRPDmf5uXQVp77HydWgd471q9M31Sncgu6z9xelgZzC2GQ6M3L6HEZC5Fji2uUtHkiMuf2iLERnv+LcZjZz1MNBU1Z4cjeYzmRiAKpV9qhemDZjzZSBqGMAxQG1Zw2jcLfli0uKosM8iyFS8Sq5iPU/T5LXiP36VfFF7yK/qhyeXxFOWWwo9WfI7y2kb9WzVADcoM8LSDny8Yhyr1pUoOL/OmMuMfJ6/bOs78sPPf3JXXtqfZk/t42/8BDuXrH2VyLeCPq5Qmvo5V/xt75Ez0/zrS6TrgX8Dn8Dxppo6GH9K4Yx023aEs2KqFQ3yWujPeRYGxtNP7tBSNxLSU2No8OGJRzLOhvBAPVrqkOpv+hUh+o5KN9Q2IJk2LytLPGg= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > pmem_mkpage_present() is called after persistent-memory poison has been > cleared. It only needs to clear PG_hwpoison and undo the MCE nospec state > for PFNs that are still marked poisoned. > > For clean PFNs, test_and_clear_pmem_poison() has no semantic effect, but it > still performs an atomic clear operation against struct page flags. That is > unnecessary today and conflicts with the FS-DAX vmemmap optimization added > later in the series, where clean PFNs may be backed by shared read-only > metadata. > > Check PageHWPoison() first so only poisoned PFNs update the page state. > Poison recovery keeps the same behavior, while clean PFNs no longer require > writable per-PFN metadata. > > Signed-off-by: Muchun Song Reviewed-by: Pankaj Gupta > --- > drivers/nvdimm/pmem.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c > index 30a51c365ce8..b14f75daeda7 100644 > --- a/drivers/nvdimm/pmem.c > +++ b/drivers/nvdimm/pmem.c > @@ -80,7 +80,7 @@ static void pmem_mkpage_present(struct pmem_device *pmem, phys_addr_t offset, > * here since we're in the driver I/O path and > * outstanding I/O requests pin the dev_pagemap. > */ > - if (test_and_clear_pmem_poison(page)) > + if (PageHWPoison(page) && test_and_clear_pmem_poison(page)) > clear_mce_nospec(pfn); > } > }