| Message ID | 20240621142504.1940209-5-peterx@redhat.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | mm/mprotect: Fix dax puds | expand |
On Fri, Jun 21, 2024 at 10:25:01AM -0400, Peter Xu wrote: > +pmd_t pudp_invalidate(struct vm_area_struct *vma, unsigned long address, > + pud_t *pudp) > +{ > + unsigned long old_pud; > + > + VM_WARN_ON_ONCE(!pmd_present(*pmdp)); > + old_pmd = pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, _PAGE_INVALID); > + flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE); > + return __pmd(old_pmd); > +} I'll need an amend at least here, and my test harness won't catch it even if it's a mistake as silly as it could be.. My apologies for such noise. Below is what I plan to squash into this patch when I repost v2. ===8<=== diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c index c6ae969020e0..ea2c83634434 100644 --- a/arch/powerpc/mm/book3s64/pgtable.c +++ b/arch/powerpc/mm/book3s64/pgtable.c @@ -176,15 +176,15 @@ pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, return __pmd(old_pmd); } -pmd_t pudp_invalidate(struct vm_area_struct *vma, unsigned long address, +pud_t pudp_invalidate(struct vm_area_struct *vma, unsigned long address, pud_t *pudp) { unsigned long old_pud; - VM_WARN_ON_ONCE(!pmd_present(*pmdp)); - old_pmd = pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, _PAGE_INVALID); - flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE); - return __pmd(old_pmd); + VM_WARN_ON_ONCE(!pud_present(*pudp)); + old_pud = pud_hugepage_update(vma->vm_mm, address, pudp, _PAGE_PRESENT, _PAGE_INVALID); + flush_pud_tlb_range(vma, address, address + HPAGE_PUD_SIZE); + return __pud(old_pud); } pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma, ===8<===
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 8f9432e3855a..fc628a984669 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -1108,6 +1108,7 @@ extern pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot); extern pud_t pfn_pud(unsigned long pfn, pgprot_t pgprot); extern pmd_t mk_pmd(struct page *page, pgprot_t pgprot); extern pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot); +extern pud_t pud_modify(pud_t pud, pgprot_t newprot); extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd); extern void set_pud_at(struct mm_struct *mm, unsigned long addr, @@ -1368,6 +1369,8 @@ static inline pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, #define __HAVE_ARCH_PMDP_INVALIDATE extern pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp); +extern pud_t pudp_invalidate(struct vm_area_struct *vma, unsigned long address, + pud_t *pudp); #define pmd_move_must_withdraw pmd_move_must_withdraw struct spinlock; diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c index 2975ea0841ba..c6ae969020e0 100644 --- a/arch/powerpc/mm/book3s64/pgtable.c +++ b/arch/powerpc/mm/book3s64/pgtable.c @@ -176,6 +176,17 @@ pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, return __pmd(old_pmd); } +pmd_t pudp_invalidate(struct vm_area_struct *vma, unsigned long address, + pud_t *pudp) +{ + unsigned long old_pud; + + VM_WARN_ON_ONCE(!pmd_present(*pmdp)); + old_pmd = pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, _PAGE_INVALID); + flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE); + return __pmd(old_pmd); +} + pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmdp, int full) { @@ -259,6 +270,15 @@ pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) pmdv &= _HPAGE_CHG_MASK; return pmd_set_protbits(__pmd(pmdv), newprot); } + +pud_t pud_modify(pud_t pud, pgprot_t newprot) +{ + unsigned long pudv; + + pudv = pud_val(pud); + pudv &= _HPAGE_CHG_MASK; + return pud_set_protbits(__pud(pudv), newprot); +} #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ /* For use by kexec, called with MMU off */
These new helpers will be needed for pud entry updates soon. Namely: - pudp_invalidate() - pud_modify() Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: linuxppc-dev@lists.ozlabs.org Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Peter Xu <peterx@redhat.com> --- arch/powerpc/include/asm/book3s/64/pgtable.h | 3 +++ arch/powerpc/mm/book3s64/pgtable.c | 20 ++++++++++++++++++++ 2 files changed, 23 insertions(+)