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From: Muchun Song In-Reply-To: <20231214073912.1938330-2-sunnanyong@huawei.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 6A34CC0014 X-Stat-Signature: z4z5nk9r8ah95dfqo1dnnrit6tt9ycpd X-Rspam-User: X-HE-Tag: 1702611373-110836 X-HE-Meta: U2FsdGVkX18190dnxlSrv3KA1B2J6RTz5Gi5JWA+smkFMO0iu5tZ1C7blDTy1RiaqGi0ekPAe28Ox7zs78LgusX3FcJcrk9Q1h9wWD432zyNlVMbTH7fqlIrGhaB3FEBwfvAJ+4BvyzyJbxi1lE/S3Y8+7bfe0j2Ud7/ZnvRuSQ4ZQS39onI6Hpu6CezXpls3Nnv/1fWP14kEhmq53Fw8Mexq7BNdzHT4ge+nQN68uI0Un1MMTV2T8dt4EWtoecSEFSg4JFpoNB86TqINjX9zij4JJ2Us1i+IJp1NCY+w8otnW87GkJTv84C87JcdxZ0GVeJRKNw4ojthLRlvPyH5lDLES+cUaF9WHGpy+v9+pNIPNBKLgen9zHNe6PqkoCzDhuAHRDcMWFRS9d6E+jCV1hx/P1OqbnZmf5G97k3wzrveM8kJwqmxlgwltHhuwvk21F5nN8s6OGRc7FPx4IN4SP9OnFcokUBCRK4hEltFP0G/B08XXX7u8MVJJy9r2TaWuyjiOBgIZzQe6gSwLzyaydA2VgAu8Am2gAWV4WwRSevZm17aXLSn+Ela6YI6WKgVJzEw178d+b6nhm8O7hX5uzOl/2OMDhPPa4TYR4h7QLIjCWDF5649YSL5aBQiXnRy+8sCG6yPFWk74pQ9KutFqZeq0ilT/dBX/pTwI7cSrFR3rfULDbM2Fk8VARb/y/1pGI4sk594c4m0pM+RBusDnTrBRqOOJ9HoH2r/eZHuyIwoP5lWMmpxiLDz02q5s//L1Xu/Z5GjwWMq0GCVh6Ct7VJ5XtJdo1fxBeZetpjao861O2/N6EAF9ZWWUtK9O9LuagbR2WAtBWNYvgDnD8Hv6hEHZkvPCTXmYi6YgrHCeunDuN/vWkV+kBKKDuZ3yrx97u0ICSXl0iIMDnShaqcGotr3ZOCiA8pLfzJ3yjC9HeFO6PsnXf1iSpRFw6GYitwJC9SC8cESHeSMAdAL7H aYu4MpRC f3lq92d6pEBYT+eiYN7lRRqD7OP+y+zT4+VUZVRm2TsXS/D5GoMYmGPKoybQ0/VXVvOv83QucGoONYyfyoC7bCs1BSDWbuUiruAFHuJ/MvMFB5FGWBRJzwBBYl5NVuf9853yFZZ0KYVg+o0wCltZz8Pmb2YrQBDA1inHCfnVSLWjyEOo= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2023/12/14 15:39, Nanyong Sun wrote: > Add pmd/pte update and tlb flush helper function to update page > table. This refactoring patch is designed to facilitate each > architecture to implement its own special logic in preparation > for the arm64 architecture to follow the necessary break-before-make > sequence when updating page tables. > > Signed-off-by: Nanyong Sun > --- > mm/hugetlb_vmemmap.c | 55 ++++++++++++++++++++++++++++++++++---------- > 1 file changed, 43 insertions(+), 12 deletions(-) > > diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c > index 87818ee7f01d..49e8b351def3 100644 > --- a/mm/hugetlb_vmemmap.c > +++ b/mm/hugetlb_vmemmap.c > @@ -45,6 +45,37 @@ struct vmemmap_remap_walk { > unsigned long flags; > }; > > +#ifndef vmemmap_update_pmd > +static inline void vmemmap_update_pmd(unsigned long start, > + pmd_t *pmd, pte_t *pgtable) > +{ > + pmd_populate_kernel(&init_mm, pmd, pgtable); > +} > +#endif > + > +#ifndef vmemmap_update_pte > +static inline void vmemmap_update_pte(unsigned long addr, > + pte_t *pte, pte_t entry) > +{ > + set_pte_at(&init_mm, addr, pte, entry); > +} > +#endif > + > +#ifndef flush_tlb_vmemmap_all > +static inline void flush_tlb_vmemmap_all(void) > +{ > + flush_tlb_all(); > +} > +#endif > + > +#ifndef flush_tlb_vmemmap_range > +static inline void flush_tlb_vmemmap_range(unsigned long start, > + unsigned long end) > +{ > + flush_tlb_kernel_range(start, end); > +} > +#endif I'd like to rename both tlb-flush helpers to vmemmap_flush_tlb_all/range since other helpers all are prefixed with "vmemmap". It'll be more consistent for me. Otherwise LGTM. Thanks. Reviewed-by: Muchun Song > + > static int split_vmemmap_huge_pmd(pmd_t *pmd, unsigned long start, bool flush) > { > pmd_t __pmd; > @@ -87,9 +118,9 @@ static int split_vmemmap_huge_pmd(pmd_t *pmd, unsigned long start, bool flush) > > /* Make pte visible before pmd. See comment in pmd_install(). */ > smp_wmb(); > - pmd_populate_kernel(&init_mm, pmd, pgtable); > + vmemmap_update_pmd(start, pmd, pgtable); > if (flush) > - flush_tlb_kernel_range(start, start + PMD_SIZE); > + flush_tlb_vmemmap_range(start, start + PMD_SIZE); > } else { > pte_free_kernel(&init_mm, pgtable); > } > @@ -217,7 +248,7 @@ static int vmemmap_remap_range(unsigned long start, unsigned long end, > } while (pgd++, addr = next, addr != end); > > if (walk->remap_pte && !(walk->flags & VMEMMAP_REMAP_NO_TLB_FLUSH)) > - flush_tlb_kernel_range(start, end); > + flush_tlb_vmemmap_range(start, end); > > return 0; > } > @@ -263,15 +294,15 @@ static void vmemmap_remap_pte(pte_t *pte, unsigned long addr, > > /* > * Makes sure that preceding stores to the page contents from > - * vmemmap_remap_free() become visible before the set_pte_at() > - * write. > + * vmemmap_remap_free() become visible before the > + * vmemmap_update_pte() write. > */ > smp_wmb(); > } > > entry = mk_pte(walk->reuse_page, pgprot); > list_add(&page->lru, walk->vmemmap_pages); > - set_pte_at(&init_mm, addr, pte, entry); > + vmemmap_update_pte(addr, pte, entry); > } > > /* > @@ -310,10 +341,10 @@ static void vmemmap_restore_pte(pte_t *pte, unsigned long addr, > > /* > * Makes sure that preceding stores to the page contents become visible > - * before the set_pte_at() write. > + * before the vmemmap_update_pte() write. > */ > smp_wmb(); > - set_pte_at(&init_mm, addr, pte, mk_pte(page, pgprot)); > + vmemmap_update_pte(addr, pte, mk_pte(page, pgprot)); > } > > /** > @@ -576,7 +607,7 @@ long hugetlb_vmemmap_restore_folios(const struct hstate *h, > } > > if (restored) > - flush_tlb_all(); > + flush_tlb_vmemmap_all(); > if (!ret) > ret = restored; > return ret; > @@ -744,7 +775,7 @@ void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_l > break; > } > > - flush_tlb_all(); > + flush_tlb_vmemmap_all(); > > list_for_each_entry(folio, folio_list, lru) { > int ret = __hugetlb_vmemmap_optimize_folio(h, folio, > @@ -760,7 +791,7 @@ void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_l > * allowing more vmemmap remaps to occur. > */ > if (ret == -ENOMEM && !list_empty(&vmemmap_pages)) { > - flush_tlb_all(); > + flush_tlb_vmemmap_all(); > free_vmemmap_page_list(&vmemmap_pages); > INIT_LIST_HEAD(&vmemmap_pages); > __hugetlb_vmemmap_optimize_folio(h, folio, > @@ -769,7 +800,7 @@ void hugetlb_vmemmap_optimize_folios(struct hstate *h, struct list_head *folio_l > } > } > > - flush_tlb_all(); > + flush_tlb_vmemmap_all(); > free_vmemmap_page_list(&vmemmap_pages); > } >