diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2021-02-05 13:07:11 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-02-09 15:05:44 +0300 |
| commit | 9fd6dad1261a541b3f5fa7dc5b152222306e6702 (patch) | |
| tree | 07a393402e4e9d938a094731c816ca3b54da8711 /arch/s390/pci/pci_mmio.c | |
| parent | 897218ff7cf19290ec2d69652ce673d8ed6fedeb (diff) | |
| download | linux-9fd6dad1261a541b3f5fa7dc5b152222306e6702.tar.xz | |
mm: provide a saner PTE walking API for modules
Currently, the follow_pfn function is exported for modules but
follow_pte is not. However, follow_pfn is very easy to misuse,
because it does not provide protections (so most of its callers
assume the page is writable!) and because it returns after having
already unlocked the page table lock.
Provide instead a simplified version of follow_pte that does
not have the pmdpp and range arguments. The older version
survives as follow_invalidate_pte() for use by fs/dax.c.
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/s390/pci/pci_mmio.c')
| -rw-r--r-- | arch/s390/pci/pci_mmio.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/pci/pci_mmio.c b/arch/s390/pci/pci_mmio.c index 18f2d10c3176..474617b88648 100644 --- a/arch/s390/pci/pci_mmio.c +++ b/arch/s390/pci/pci_mmio.c @@ -170,7 +170,7 @@ SYSCALL_DEFINE3(s390_pci_mmio_write, unsigned long, mmio_addr, if (!(vma->vm_flags & VM_WRITE)) goto out_unlock_mmap; - ret = follow_pte(vma->vm_mm, mmio_addr, NULL, &ptep, NULL, &ptl); + ret = follow_pte(vma->vm_mm, mmio_addr, &ptep, &ptl); if (ret) goto out_unlock_mmap; @@ -311,7 +311,7 @@ SYSCALL_DEFINE3(s390_pci_mmio_read, unsigned long, mmio_addr, if (!(vma->vm_flags & VM_WRITE)) goto out_unlock_mmap; - ret = follow_pte(vma->vm_mm, mmio_addr, NULL, &ptep, NULL, &ptl); + ret = follow_pte(vma->vm_mm, mmio_addr, &ptep, &ptl); if (ret) goto out_unlock_mmap; |