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 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: David Hildenbrand wrote: > Based on Linus' master. > > While working on improving vm_normal_page() and friends, I stumbled > over this issues: refcounted "normal" pages must not be marked > using pmd_special() / pud_special(). > > Fortunately, so far there doesn't seem to be serious damage. > > This is only compile-tested so far. Still looking for an easy way to test > PMD/PUD mappings with DAX. Any tests I can easily run? The way I test this I would not classify as "easy", it is a bit of a pain to setup, but it is passing here: [root@host ndctl]# meson test -C build --suite ndctl:dax ninja: Entering directory `/root/git/ndctl/build' [168/168] Linking target cxl/cxl 1/13 ndctl:dax / daxdev-errors.sh OK 14.30s 2/13 ndctl:dax / multi-dax.sh OK 2.89s 3/13 ndctl:dax / sub-section.sh OK 8.40s 4/13 ndctl:dax / dax-dev OK 0.06s 5/13 ndctl:dax / dax-ext4.sh OK 20.53s 6/13 ndctl:dax / dax-xfs.sh OK 20.34s 7/13 ndctl:dax / device-dax OK 11.67s 8/13 ndctl:dax / revoke-devmem OK 0.25s 9/13 ndctl:dax / device-dax-fio.sh OK 34.02s 10/13 ndctl:dax / daxctl-devices.sh OK 3.44s 11/13 ndctl:dax / daxctl-create.sh SKIP 0.32s exit status 77 12/13 ndctl:dax / dm.sh OK 1.33s 13/13 ndctl:dax / mmap.sh OK 85.12s ...ignore the SKIP, that seems to be caused by an acpi-einj regression. However, how about not duplicating the internals of insert_pfn_p[mu]d() with something like the below. Either way you can add: Tested-by: Dan Williams Reviewed-by: Dan Williams base-commit: a9dfb7db96f7bc1f30feae673aab7fdbfbc94e9c -- 8< -- diff --git a/mm/huge_memory.c b/mm/huge_memory.c index d3e66136e41a..cce4456aa62b 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1372,9 +1372,9 @@ vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf) return __do_huge_pmd_anonymous_page(vmf); } -static int insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr, - pmd_t *pmd, pfn_t pfn, pgprot_t prot, bool write, - pgtable_t pgtable) +static int insert_pmd(struct vm_area_struct *vma, unsigned long addr, + pmd_t *pmd, pfn_t pfn, struct folio *folio, + pgprot_t prot, bool write, pgtable_t pgtable) { struct mm_struct *mm = vma->vm_mm; pmd_t entry; @@ -1397,9 +1397,7 @@ static int insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr, } entry = pmd_mkhuge(pfn_t_pmd(pfn, prot)); - if (pfn_t_devmap(pfn)) - entry = pmd_mkdevmap(entry); - else + if (!folio) entry = pmd_mkspecial(entry); if (write) { entry = pmd_mkyoung(pmd_mkdirty(entry)); @@ -1458,8 +1456,8 @@ vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write) pfnmap_setup_cachemode_pfn(pfn_t_to_pfn(pfn), &pgprot); ptl = pmd_lock(vma->vm_mm, vmf->pmd); - error = insert_pfn_pmd(vma, addr, vmf->pmd, pfn, pgprot, write, - pgtable); + error = insert_pmd(vma, addr, vmf->pmd, pfn, NULL, pgprot, write, + pgtable); spin_unlock(ptl); if (error && pgtable) pte_free(vma->vm_mm, pgtable); @@ -1496,9 +1494,8 @@ vm_fault_t vmf_insert_folio_pmd(struct vm_fault *vmf, struct folio *folio, folio_add_file_rmap_pmd(folio, &folio->page, vma); add_mm_counter(mm, mm_counter_file(folio), HPAGE_PMD_NR); } - error = insert_pfn_pmd(vma, addr, vmf->pmd, - pfn_to_pfn_t(folio_pfn(folio)), vma->vm_page_prot, - write, pgtable); + error = insert_pmd(vma, addr, vmf->pmd, pfn_to_pfn_t(folio_pfn(folio)), + folio, vma->vm_page_prot, write, pgtable); spin_unlock(ptl); if (error && pgtable) pte_free(mm, pgtable); @@ -1515,8 +1512,8 @@ static pud_t maybe_pud_mkwrite(pud_t pud, struct vm_area_struct *vma) return pud; } -static void insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr, - pud_t *pud, pfn_t pfn, bool write) +static void insert_pud(struct vm_area_struct *vma, unsigned long addr, + pud_t *pud, pfn_t pfn, struct folio *folio, bool write) { struct mm_struct *mm = vma->vm_mm; pgprot_t prot = vma->vm_page_prot; @@ -1535,9 +1532,7 @@ static void insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr, } entry = pud_mkhuge(pfn_t_pud(pfn, prot)); - if (pfn_t_devmap(pfn)) - entry = pud_mkdevmap(entry); - else + if (!folio) entry = pud_mkspecial(entry); if (write) { entry = pud_mkyoung(pud_mkdirty(entry)); @@ -1581,7 +1576,7 @@ vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write) pfnmap_setup_cachemode_pfn(pfn_t_to_pfn(pfn), &pgprot); ptl = pud_lock(vma->vm_mm, vmf->pud); - insert_pfn_pud(vma, addr, vmf->pud, pfn, write); + insert_pud(vma, addr, vmf->pud, pfn, NULL, write); spin_unlock(ptl); return VM_FAULT_NOPAGE; @@ -1616,7 +1611,7 @@ vm_fault_t vmf_insert_folio_pud(struct vm_fault *vmf, struct folio *folio, /* * If there is already an entry present we assume the folio is * already mapped, hence no need to take another reference. We - * still call insert_pfn_pud() though in case the mapping needs + * still call insert_pud() though in case the mapping needs * upgrading to writeable. */ if (pud_none(*vmf->pud)) { @@ -1624,8 +1619,8 @@ vm_fault_t vmf_insert_folio_pud(struct vm_fault *vmf, struct folio *folio, folio_add_file_rmap_pud(folio, &folio->page, vma); add_mm_counter(mm, mm_counter_file(folio), HPAGE_PUD_NR); } - insert_pfn_pud(vma, addr, vmf->pud, pfn_to_pfn_t(folio_pfn(folio)), - write); + insert_pud(vma, addr, vmf->pud, pfn_to_pfn_t(folio_pfn(folio)), folio, + write); spin_unlock(ptl); return VM_FAULT_NOPAGE;