#include <linux/hugetlb.h>
#include <linux/hugetlb_cgroup.h>
#include <linux/node.h>
-#include <linux/userfaultfd_k.h>
#include <linux/page_owner.h>
#include "internal.h"
resv->region_cache_count;
/* At this point, we should have enough entries in the cache
- * for all the existings adds_in_progress. We should only be
+ * for all the existing adds_in_progress. We should only be
* needing to allocate for regions_needed.
*/
VM_BUG_ON(resv->region_cache_count < resv->adds_in_progress);
static struct page *dequeue_huge_page_node_exact(struct hstate *h, int nid)
{
struct page *page;
- bool nocma = !!(current->flags & PF_MEMALLOC_NOCMA);
+ bool pin = !!(current->flags & PF_MEMALLOC_PIN);
lockdep_assert_held(&hugetlb_lock);
list_for_each_entry(page, &h->hugepage_freelists[nid], lru) {
- if (nocma && is_migrate_cma_page(page))
+ if (pin && !is_pinnable_page(page))
continue;
if (PageHWPoison(page))
return 0;
}
+static inline vm_fault_t hugetlb_handle_userfault(struct vm_area_struct *vma,
+ struct address_space *mapping,
+ pgoff_t idx,
+ unsigned int flags,
+ unsigned long haddr,
+ unsigned long reason)
+{
+ vm_fault_t ret;
+ u32 hash;
+ struct vm_fault vmf = {
+ .vma = vma,
+ .address = haddr,
+ .flags = flags,
+
+ /*
+ * Hard to debug if it ends up being
+ * used by a callee that assumes
+ * something about the other
+ * uninitialized fields... same as in
+ * memory.c
+ */
+ };
+
+ /*
+ * hugetlb_fault_mutex and i_mmap_rwsem must be
+ * dropped before handling userfault. Reacquire
+ * after handling fault to make calling code simpler.
+ */
+ hash = hugetlb_fault_mutex_hash(mapping, idx);
+ mutex_unlock(&hugetlb_fault_mutex_table[hash]);
+ i_mmap_unlock_read(mapping);
+ ret = handle_userfault(&vmf, reason);
+ i_mmap_lock_read(mapping);
+ mutex_lock(&hugetlb_fault_mutex_table[hash]);
+
+ return ret;
+}
+
static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
struct vm_area_struct *vma,
struct address_space *mapping, pgoff_t idx,
retry:
page = find_lock_page(mapping, idx);
if (!page) {
- /*
- * Check for page in userfault range
- */
+ /* Check for page in userfault range */
if (userfaultfd_missing(vma)) {
- u32 hash;
- struct vm_fault vmf = {
- .vma = vma,
- .address = haddr,
- .flags = flags,
- /*
- * Hard to debug if it ends up being
- * used by a callee that assumes
- * something about the other
- * uninitialized fields... same as in
- * memory.c
- */
- };
-
- /*
- * hugetlb_fault_mutex and i_mmap_rwsem must be
- * dropped before handling userfault. Reacquire
- * after handling fault to make calling code simpler.
- */
- hash = hugetlb_fault_mutex_hash(mapping, idx);
- mutex_unlock(&hugetlb_fault_mutex_table[hash]);
- i_mmap_unlock_read(mapping);
- ret = handle_userfault(&vmf, VM_UFFD_MISSING);
- i_mmap_lock_read(mapping);
- mutex_lock(&hugetlb_fault_mutex_table[hash]);
+ ret = hugetlb_handle_userfault(vma, mapping, idx,
+ flags, haddr,
+ VM_UFFD_MISSING);
goto out;
}
VM_FAULT_SET_HINDEX(hstate_index(h));
goto backout_unlocked;
}
+
+ /* Check for page in userfault range. */
+ if (userfaultfd_minor(vma)) {
+ unlock_page(page);
+ put_page(page);
+ ret = hugetlb_handle_userfault(vma, mapping, idx,
+ flags, haddr,
+ VM_UFFD_MINOR);
+ goto out;
+ }
}
/*
return ret;
}
+#ifdef CONFIG_USERFAULTFD
/*
* Used by userfaultfd UFFDIO_COPY. Based on mcopy_atomic_pte with
* modifications for huge pages.
struct vm_area_struct *dst_vma,
unsigned long dst_addr,
unsigned long src_addr,
+ enum mcopy_atomic_mode mode,
struct page **pagep)
{
+ bool is_continue = (mode == MCOPY_ATOMIC_CONTINUE);
struct address_space *mapping;
pgoff_t idx;
unsigned long size;
spinlock_t *ptl;
int ret;
struct page *page;
+ int writable;
+
+ mapping = dst_vma->vm_file->f_mapping;
+ idx = vma_hugecache_offset(h, dst_vma, dst_addr);
- if (!*pagep) {
+ if (is_continue) {
+ ret = -EFAULT;
+ page = find_lock_page(mapping, idx);
+ if (!page)
+ goto out;
+ } else if (!*pagep) {
ret = -ENOMEM;
page = alloc_huge_page(dst_vma, dst_addr, 0);
if (IS_ERR(page))
*/
__SetPageUptodate(page);
- mapping = dst_vma->vm_file->f_mapping;
- idx = vma_hugecache_offset(h, dst_vma, dst_addr);
-
- /*
- * If shared, add to page cache
- */
- if (vm_shared) {
+ /* Add shared, newly allocated pages to the page cache. */
+ if (vm_shared && !is_continue) {
size = i_size_read(mapping->host) >> huge_page_shift(h);
ret = -EFAULT;
if (idx >= size)
hugepage_add_new_anon_rmap(page, dst_vma, dst_addr);
}
- _dst_pte = make_huge_pte(dst_vma, page, dst_vma->vm_flags & VM_WRITE);
- if (dst_vma->vm_flags & VM_WRITE)
+ /* For CONTINUE on a non-shared VMA, don't set VM_WRITE for CoW. */
+ if (is_continue && !vm_shared)
+ writable = 0;
+ else
+ writable = dst_vma->vm_flags & VM_WRITE;
+
+ _dst_pte = make_huge_pte(dst_vma, page, writable);
+ if (writable)
_dst_pte = huge_pte_mkdirty(_dst_pte);
_dst_pte = pte_mkyoung(_dst_pte);
update_mmu_cache(dst_vma, dst_addr, dst_pte);
spin_unlock(ptl);
- SetHPageMigratable(page);
- if (vm_shared)
+ if (!is_continue)
+ SetHPageMigratable(page);
+ if (vm_shared || is_continue)
unlock_page(page);
ret = 0;
out:
return ret;
out_release_unlock:
spin_unlock(ptl);
- if (vm_shared)
+ if (vm_shared || is_continue)
unlock_page(page);
out_release_nounlock:
put_page(page);
goto out;
}
+#endif /* CONFIG_USERFAULTFD */
static void record_subpages_vmas(struct page *page, struct vm_area_struct *vma,
int refs, struct page **pages,
v_end = ALIGN_DOWN(vma->vm_end, PUD_SIZE);
/*
- * vma need span at least one aligned PUD size and the start,end range
- * must at least partialy within it.
+ * vma needs to span at least one aligned PUD size, and the range
+ * must be at least partially within in.
*/
if (!(vma->vm_flags & VM_MAYSHARE) || !(v_end > v_start) ||
(*end <= v_start) || (*start >= v_end))
projects / linux-2.6-microblaze.git / blobdiff