if (likely(pmd_none(*pmd))) { /* Has another populated it ? */
mm_inc_nr_ptes(mm);
+ /*
+ * Ensure all pte setup (eg. pte page lock and page clearing) are
+ * visible before the pte is made visible to other CPUs by being
+ * put into page tables.
+ *
+ * The other side of the story is the pointer chasing in the page
+ * table walking code (when walking the page table without locking;
+ * ie. most of the time). Fortunately, these data accesses consist
+ * of a chain of data-dependent loads, meaning most CPUs (alpha
+ * being the notable exception) will already guarantee loads are
+ * seen in-order. See the alpha page table accessors for the
+ * smp_rmb() barriers in page table walking code.
+ */
+ smp_wmb(); /* Could be smp_wmb__xxx(before|after)_spin_lock */
pmd_populate(mm, pmd, *pte);
*pte = NULL;
}
if (!new)
return -ENOMEM;
- /*
- * Ensure all pte setup (eg. pte page lock and page clearing) are
- * visible before the pte is made visible to other CPUs by being
- * put into page tables.
- *
- * The other side of the story is the pointer chasing in the page
- * table walking code (when walking the page table without locking;
- * ie. most of the time). Fortunately, these data accesses consist
- * of a chain of data-dependent loads, meaning most CPUs (alpha
- * being the notable exception) will already guarantee loads are
- * seen in-order. See the alpha page table accessors for the
- * smp_rmb() barriers in page table walking code.
- */
- smp_wmb(); /* Could be smp_wmb__xxx(before|after)_spin_lock */
-
pmd_install(mm, pmd, &new);
if (new)
pte_free(mm, new);
if (!new)
return -ENOMEM;
- smp_wmb(); /* See comment in __pte_alloc */
-
spin_lock(&init_mm.page_table_lock);
if (likely(pmd_none(*pmd))) { /* Has another populated it ? */
+ smp_wmb(); /* See comment in pmd_install() */
pmd_populate_kernel(&init_mm, pmd, new);
new = NULL;
}
if (!new_page)
return NULL;
- if (mem_cgroup_charge(new_page, src_mm, GFP_KERNEL)) {
+ if (mem_cgroup_charge(page_folio(new_page), src_mm, GFP_KERNEL)) {
put_page(new_page);
return NULL;
}
}
}
- if (mem_cgroup_charge(new_page, mm, GFP_KERNEL))
+ if (mem_cgroup_charge(page_folio(new_page), mm, GFP_KERNEL))
goto oom_free_new;
cgroup_throttle_swaprate(new_page, GFP_KERNEL);
shadow = get_shadow_from_swap_cache(entry);
if (shadow)
- workingset_refault(page, shadow);
+ workingset_refault(page_folio(page),
+ shadow);
lru_cache_add(page);
if (!page)
goto oom;
- if (mem_cgroup_charge(page, vma->vm_mm, GFP_KERNEL))
+ if (mem_cgroup_charge(page_folio(page), vma->vm_mm, GFP_KERNEL))
goto oom_free_page;
cgroup_throttle_swaprate(page, GFP_KERNEL);
vmf->prealloc_pte = pte_alloc_one(vma->vm_mm);
if (!vmf->prealloc_pte)
return VM_FAULT_OOM;
- smp_wmb(); /* See comment in __pte_alloc() */
}
ret = vma->vm_ops->fault(vmf);
vmf->prealloc_pte = pte_alloc_one(vma->vm_mm);
if (!vmf->prealloc_pte)
return VM_FAULT_OOM;
- smp_wmb(); /* See comment in __pte_alloc() */
}
vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
vmf->prealloc_pte = pte_alloc_one(vmf->vma->vm_mm);
if (!vmf->prealloc_pte)
return VM_FAULT_OOM;
- smp_wmb(); /* See comment in __pte_alloc() */
}
return vmf->vma->vm_ops->map_pages(vmf, start_pgoff, end_pgoff);
if (!vmf->cow_page)
return VM_FAULT_OOM;
- if (mem_cgroup_charge(vmf->cow_page, vma->vm_mm, GFP_KERNEL)) {
+ if (mem_cgroup_charge(page_folio(vmf->cow_page), vma->vm_mm,
+ GFP_KERNEL)) {
put_page(vmf->cow_page);
return VM_FAULT_OOM;
}
* We enter with non-exclusive mmap_lock (to exclude vma changes,
* but allow concurrent faults).
* The mmap_lock may have been released depending on flags and our
- * return value. See filemap_fault() and __lock_page_or_retry().
+ * return value. See filemap_fault() and __folio_lock_or_retry().
* If mmap_lock is released, vma may become invalid (for example
* by other thread calling munmap()).
*/
* concurrent faults).
*
* The mmap_lock may have been released depending on flags and our return value.
- * See filemap_fault() and __lock_page_or_retry().
+ * See filemap_fault() and __folio_lock_or_retry().
*/
static vm_fault_t handle_pte_fault(struct vm_fault *vmf)
{
* By the time we get here, we already hold the mm semaphore
*
* The mmap_lock may have been released depending on flags and our
- * return value. See filemap_fault() and __lock_page_or_retry().
+ * return value. See filemap_fault() and __folio_lock_or_retry().
*/
static vm_fault_t __handle_mm_fault(struct vm_area_struct *vma,
unsigned long address, unsigned int flags)
* By the time we get here, we already hold the mm semaphore
*
* The mmap_lock may have been released depending on flags and our
- * return value. See filemap_fault() and __lock_page_or_retry().
+ * return value. See filemap_fault() and __folio_lock_or_retry().
*/
vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
unsigned int flags, struct pt_regs *regs)
if (!new)
return -ENOMEM;
- smp_wmb(); /* See comment in __pte_alloc */
-
spin_lock(&mm->page_table_lock);
- if (pgd_present(*pgd)) /* Another has populated it */
+ if (pgd_present(*pgd)) { /* Another has populated it */
p4d_free(mm, new);
- else
+ } else {
+ smp_wmb(); /* See comment in pmd_install() */
pgd_populate(mm, pgd, new);
+ }
spin_unlock(&mm->page_table_lock);
return 0;
}
if (!new)
return -ENOMEM;
- smp_wmb(); /* See comment in __pte_alloc */
-
spin_lock(&mm->page_table_lock);
if (!p4d_present(*p4d)) {
mm_inc_nr_puds(mm);
+ smp_wmb(); /* See comment in pmd_install() */
p4d_populate(mm, p4d, new);
} else /* Another has populated it */
pud_free(mm, new);
if (!new)
return -ENOMEM;
- smp_wmb(); /* See comment in __pte_alloc */
-
ptl = pud_lock(mm, pud);
if (!pud_present(*pud)) {
mm_inc_nr_pmds(mm);
+ smp_wmb(); /* See comment in pmd_install() */
pud_populate(mm, pud, new);
- } else /* Another has populated it */
+ } else { /* Another has populated it */
pmd_free(mm, new);
+ }
spin_unlock(ptl);
return 0;
}
return;
if (pagefault_disabled())
return;
- __might_sleep(file, line, 0);
+ __might_sleep(file, line);
#if defined(CONFIG_DEBUG_ATOMIC_SLEEP)
if (current->mm)
might_lock_read(¤t->mm->mmap_lock);
projects / linux-2.6-microblaze.git / blobdiff