[PATCH 19/30] mm: use linear_page_[index, delta]() consistently
From: Lorenzo Stoakes
Date: Mon Jun 29 2026 - 08:34:46 EST
There are a number of places where we open code what linear_page_index()
and linear_page_delta() calculate.
Replace this code with the appropriate functions for consistency.
No functional change intended.
Signed-off-by: Lorenzo Stoakes <ljs@xxxxxxxxxx>
---
arch/arm/mm/fault-armv.c | 2 +-
arch/x86/kernel/cpu/sgx/virt.c | 3 ++-
drivers/comedi/comedi_fops.c | 3 ++-
drivers/gpu/drm/etnaviv/etnaviv_gem.c | 3 ++-
drivers/gpu/drm/gma500/gem.c | 2 +-
drivers/gpu/drm/msm/msm_gem.c | 3 ++-
drivers/gpu/drm/omapdrm/omap_gem.c | 5 +++--
drivers/gpu/drm/tegra/gem.c | 3 ++-
drivers/gpu/drm/ttm/ttm_bo_vm.c | 7 ++++---
drivers/vfio/pci/nvgrace-gpu/main.c | 3 ++-
drivers/vfio/pci/vfio_pci_core.c | 3 ++-
mm/nommu.c | 2 +-
mm/vma.c | 2 +-
virt/kvm/guest_memfd.c | 2 +-
14 files changed, 26 insertions(+), 17 deletions(-)
diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c
index bd1ad4181a53..306cfd7b0765 100644
--- a/arch/arm/mm/fault-armv.c
+++ b/arch/arm/mm/fault-armv.c
@@ -132,7 +132,7 @@ make_coherent(struct address_space *mapping, struct vm_area_struct *vma,
pgoff_t pgoff;
int aliases = 0;
- pgoff = vma->vm_pgoff + ((addr - vma->vm_start) >> PAGE_SHIFT);
+ pgoff = linear_page_index(vma, addr);
/*
* If we have any shared mappings that are in the same mm
diff --git a/arch/x86/kernel/cpu/sgx/virt.c b/arch/x86/kernel/cpu/sgx/virt.c
index db6806c40483..6a1933ddc6fc 100644
--- a/arch/x86/kernel/cpu/sgx/virt.c
+++ b/arch/x86/kernel/cpu/sgx/virt.c
@@ -9,6 +9,7 @@
#include <linux/miscdevice.h>
#include <linux/mm.h>
#include <linux/mman.h>
+#include <linux/pagemap.h>
#include <linux/sched/mm.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
@@ -41,7 +42,7 @@ static int __sgx_vepc_fault(struct sgx_vepc *vepc,
WARN_ON(!mutex_is_locked(&vepc->lock));
/* Calculate index of EPC page in virtual EPC's page_array */
- index = vma->vm_pgoff + PFN_DOWN(addr - vma->vm_start);
+ index = linear_page_index(vma, addr);
epc_page = xa_load(&vepc->page_array, index);
if (epc_page)
diff --git a/drivers/comedi/comedi_fops.c b/drivers/comedi/comedi_fops.c
index c09bbe04be6c..536c25d8dcee 100644
--- a/drivers/comedi/comedi_fops.c
+++ b/drivers/comedi/comedi_fops.c
@@ -25,6 +25,7 @@
#include <linux/fs.h>
#include <linux/comedi/comedidev.h>
#include <linux/cdev.h>
+#include <linux/pagemap.h>
#include <linux/io.h>
#include <linux/uaccess.h>
@@ -2462,7 +2463,7 @@ static int comedi_vm_access(struct vm_area_struct *vma, unsigned long addr,
{
struct comedi_buf_map *bm = vma->vm_private_data;
unsigned long offset =
- addr - vma->vm_start + (vma->vm_pgoff << PAGE_SHIFT);
+ addr - vma->vm_start + (vma_start_pgoff(vma) << PAGE_SHIFT);
if (len < 0)
return -EINVAL;
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index b0436a1e103f..2e4d6d117ee2 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -6,6 +6,7 @@
#include <drm/drm_prime.h>
#include <drm/drm_print.h>
#include <linux/dma-mapping.h>
+#include <linux/pagemap.h>
#include <linux/shmem_fs.h>
#include <linux/spinlock.h>
#include <linux/vmalloc.h>
@@ -188,7 +189,7 @@ static vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf)
}
/* We don't use vmf->pgoff since that has the fake offset: */
- pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
+ pgoff = linear_page_delta(vma, vmf->address);
pfn = page_to_pfn(pages[pgoff]);
diff --git a/drivers/gpu/drm/gma500/gem.c b/drivers/gpu/drm/gma500/gem.c
index 88f1e86c8903..2708e8c68f4c 100644
--- a/drivers/gpu/drm/gma500/gem.c
+++ b/drivers/gpu/drm/gma500/gem.c
@@ -288,7 +288,7 @@ static vm_fault_t psb_gem_fault(struct vm_fault *vmf)
/* Page relative to the VMA start - we must calculate this ourselves
because vmf->pgoff is the fake GEM offset */
- page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
+ page_offset = linear_page_delta(vma, vmf->address);
/* CPU view of the page, don't go via the GART for CPU writes */
if (pobj->stolen)
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index efd3d3c9a449..cbf723a5d86f 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -9,6 +9,7 @@
#include <linux/spinlock.h>
#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
+#include <linux/pagemap.h>
#include <drm/drm_dumb_buffers.h>
#include <drm/drm_prime.h>
@@ -360,7 +361,7 @@ static vm_fault_t msm_gem_fault(struct vm_fault *vmf)
}
/* We don't use vmf->pgoff since that has the fake offset: */
- pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
+ pgoff = linear_page_delta(vma, vmf->address);
pfn = page_to_pfn(pages[pgoff]);
diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c
index 8e013e4f2c6b..00404fb6c29a 100644
--- a/drivers/gpu/drm/omapdrm/omap_gem.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem.c
@@ -5,6 +5,7 @@
*/
#include <linux/dma-mapping.h>
+#include <linux/pagemap.h>
#include <linux/seq_file.h>
#include <linux/shmem_fs.h>
#include <linux/spinlock.h>
@@ -359,7 +360,7 @@ static vm_fault_t omap_gem_fault_1d(struct drm_gem_object *obj,
pgoff_t pgoff;
/* We don't use vmf->pgoff since that has the fake offset: */
- pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
+ pgoff = linear_page_delta(vma, vmf->address);
if (omap_obj->pages) {
omap_gem_cpu_sync_page(obj, pgoff);
@@ -407,7 +408,7 @@ static vm_fault_t omap_gem_fault_2d(struct drm_gem_object *obj,
const int m = DIV_ROUND_UP(omap_obj->width << fmt, PAGE_SIZE);
/* We don't use vmf->pgoff since that has the fake offset: */
- pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
+ pgoff = linear_page_delta(vma, vmf->address);
/*
* Actual address we start mapping at is rounded down to previous slot
diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 436394e04812..1d8d27a5ea89 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -13,6 +13,7 @@
#include <linux/dma-buf.h>
#include <linux/iommu.h>
#include <linux/module.h>
+#include <linux/pagemap.h>
#include <linux/vmalloc.h>
#include <drm/drm_drv.h>
@@ -564,7 +565,7 @@ static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
if (!bo->pages)
return VM_FAULT_SIGBUS;
- offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
+ offset = linear_page_delta(vma, vmf->address);
page = bo->pages[offset];
return vmf_insert_page(vma, vmf->address, page);
diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index a80510489c45..88babf435ac2 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -32,6 +32,7 @@
#define pr_fmt(fmt) "[TTM] " fmt
#include <linux/export.h>
+#include <linux/pagemap.h>
#include <drm/ttm/ttm_bo.h>
#include <drm/ttm/ttm_placement.h>
@@ -208,9 +209,9 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
if (unlikely(err != 0))
return VM_FAULT_SIGBUS;
- page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
- vma->vm_pgoff - drm_vma_node_start(&bo->base.vma_node);
- page_last = vma_pages(vma) + vma->vm_pgoff -
+ page_offset = linear_page_index(vma, address) -
+ drm_vma_node_start(&bo->base.vma_node);
+ page_last = vma_end_pgoff(vma) -
drm_vma_node_start(&bo->base.vma_node);
if (unlikely(page_offset >= PFN_UP(bo->base.size)))
diff --git a/drivers/vfio/pci/nvgrace-gpu/main.c b/drivers/vfio/pci/nvgrace-gpu/main.c
index d07dcacb76bd..963fd8ded20d 100644
--- a/drivers/vfio/pci/nvgrace-gpu/main.c
+++ b/drivers/vfio/pci/nvgrace-gpu/main.c
@@ -11,6 +11,7 @@
#include <linux/jiffies.h>
#include <linux/sched.h>
#include <linux/pci-p2pdma.h>
+#include <linux/pagemap.h>
#include <linux/pm_runtime.h>
#include <linux/memory-failure.h>
@@ -385,7 +386,7 @@ static unsigned long addr_to_pgoff(struct vm_area_struct *vma,
u64 pgoff = vma->vm_pgoff &
((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
- return ((addr - vma->vm_start) >> PAGE_SHIFT) + pgoff;
+ return linear_page_delta(vma, addr) + pgoff;
}
static vm_fault_t nvgrace_gpu_vfio_pci_huge_fault(struct vm_fault *vmf,
diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index a28f1e99362c..55d4937d495a 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -19,6 +19,7 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
+#include <linux/pagemap.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
@@ -1727,7 +1728,7 @@ static vm_fault_t vfio_pci_mmap_huge_fault(struct vm_fault *vmf,
struct vm_area_struct *vma = vmf->vma;
struct vfio_pci_core_device *vdev = vma->vm_private_data;
unsigned long addr = vmf->address & ~((PAGE_SIZE << order) - 1);
- unsigned long pgoff = (addr - vma->vm_start) >> PAGE_SHIFT;
+ unsigned long pgoff = linear_page_delta(vma, addr);
unsigned long pfn = vma_to_pfn(vma) + pgoff;
vm_fault_t ret = VM_FAULT_FALLBACK;
diff --git a/mm/nommu.c b/mm/nommu.c
index 60560b2c457e..7333d855e974 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1332,7 +1332,7 @@ static int split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
*region = *vma->vm_region;
new->vm_region = region;
- npages = (addr - vma->vm_start) >> PAGE_SHIFT;
+ npages = linear_page_delta(vma, addr);
if (new_below) {
region->vm_top = region->vm_end = new->vm_end = addr;
diff --git a/mm/vma.c b/mm/vma.c
index ee3a8ca13d07..185d07397ca6 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -517,7 +517,7 @@ __split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
new->vm_end = addr;
} else {
new->vm_start = addr;
- new->vm_pgoff += ((addr - vma->vm_start) >> PAGE_SHIFT);
+ new->vm_pgoff += linear_page_delta(vma, addr);
}
err = -ENOMEM;
diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c
index db57c5766ab6..f0e5da490866 100644
--- a/virt/kvm/guest_memfd.c
+++ b/virt/kvm/guest_memfd.c
@@ -440,7 +440,7 @@ static int kvm_gmem_set_policy(struct vm_area_struct *vma, struct mempolicy *mpo
static struct mempolicy *kvm_gmem_get_policy(struct vm_area_struct *vma,
unsigned long addr, pgoff_t *ilx)
{
- pgoff_t pgoff = vma->vm_pgoff + ((addr - vma->vm_start) >> PAGE_SHIFT);
+ pgoff_t pgoff = linear_page_index(vma, addr);
struct inode *inode = file_inode(vma->vm_file);
*ilx = inode->i_ino;
--
2.54.0