Re: [PATCH] hugetlb: remove unused hstate in hugetlb_fault_mutex_hash()

From: kbuild test robot
Date: Sat Oct 05 2019 - 22:26:27 EST

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In reply to: kbuild test robot: "Re: [PATCH] hugetlb: remove unused hstate in hugetlb_fault_mutex_hash()"
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Hi Wei,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[cannot apply to v5.4-rc1 next-20191004]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url: https://github.com/0day-ci/linux/commits/Wei-Yang/hugetlb-remove-unused-hstate-in-hugetlb_fault_mutex_hash/20191005-090034
reproduce:
# apt-get install sparse
# sparse version: v0.6.1-rc1-42-g38eda53-dirty
make ARCH=x86_64 allmodconfig
make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

sparse warnings: (new ones prefixed by >>)

mm/userfaultfd.c:262:17: sparse: sparse: undefined identifier 'h'
mm/userfaultfd.c:273:75: sparse: sparse: undefined identifier 'h'
mm/userfaultfd.c:300:69: sparse: sparse: undefined identifier 'h'
>> mm/userfaultfd.c:262:17: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected struct hstate *h @@ got hstate *h @@
>> mm/userfaultfd.c:262:17: sparse: expected struct hstate *h
>> mm/userfaultfd.c:262:17: sparse: got bad type
mm/userfaultfd.c:273:75: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected struct hstate *h @@ got hstate *h @@
mm/userfaultfd.c:273:75: sparse: expected struct hstate *h
mm/userfaultfd.c:273:75: sparse: got bad type
mm/userfaultfd.c:300:69: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected struct hstate *h @@ got hstate *h @@
mm/userfaultfd.c:300:69: sparse: expected struct hstate *h
mm/userfaultfd.c:300:69: sparse: got bad type

vim +262 mm/userfaultfd.c

c1a4de99fada21 Andrea Arcangeli 2015-09-04 167
60d4d2d2b40e44 Mike Kravetz 2017-02-22 168 #ifdef CONFIG_HUGETLB_PAGE
60d4d2d2b40e44 Mike Kravetz 2017-02-22 169 /*
60d4d2d2b40e44 Mike Kravetz 2017-02-22 170 * __mcopy_atomic processing for HUGETLB vmas. Note that this routine is
60d4d2d2b40e44 Mike Kravetz 2017-02-22 171 * called with mmap_sem held, it will release mmap_sem before returning.
60d4d2d2b40e44 Mike Kravetz 2017-02-22 172 */
60d4d2d2b40e44 Mike Kravetz 2017-02-22 173 static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
60d4d2d2b40e44 Mike Kravetz 2017-02-22 174 struct vm_area_struct *dst_vma,
60d4d2d2b40e44 Mike Kravetz 2017-02-22 175 unsigned long dst_start,
60d4d2d2b40e44 Mike Kravetz 2017-02-22 176 unsigned long src_start,
60d4d2d2b40e44 Mike Kravetz 2017-02-22 177 unsigned long len,
60d4d2d2b40e44 Mike Kravetz 2017-02-22 178 bool zeropage)
60d4d2d2b40e44 Mike Kravetz 2017-02-22 179 {
1c9e8def43a345 Mike Kravetz 2017-02-22 180 int vm_alloc_shared = dst_vma->vm_flags & VM_SHARED;
1c9e8def43a345 Mike Kravetz 2017-02-22 181 int vm_shared = dst_vma->vm_flags & VM_SHARED;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 182 ssize_t err;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 183 pte_t *dst_pte;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 184 unsigned long src_addr, dst_addr;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 185 long copied;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 186 struct page *page;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 187 unsigned long vma_hpagesize;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 188 pgoff_t idx;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 189 u32 hash;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 190 struct address_space *mapping;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 191
60d4d2d2b40e44 Mike Kravetz 2017-02-22 192 /*
60d4d2d2b40e44 Mike Kravetz 2017-02-22 193 * There is no default zero huge page for all huge page sizes as
60d4d2d2b40e44 Mike Kravetz 2017-02-22 194 * supported by hugetlb. A PMD_SIZE huge pages may exist as used
60d4d2d2b40e44 Mike Kravetz 2017-02-22 195 * by THP. Since we can not reliably insert a zero page, this
60d4d2d2b40e44 Mike Kravetz 2017-02-22 196 * feature is not supported.
60d4d2d2b40e44 Mike Kravetz 2017-02-22 197 */
60d4d2d2b40e44 Mike Kravetz 2017-02-22 198 if (zeropage) {
60d4d2d2b40e44 Mike Kravetz 2017-02-22 199 up_read(&dst_mm->mmap_sem);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 200 return -EINVAL;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 201 }
60d4d2d2b40e44 Mike Kravetz 2017-02-22 202
60d4d2d2b40e44 Mike Kravetz 2017-02-22 203 src_addr = src_start;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 204 dst_addr = dst_start;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 205 copied = 0;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 206 page = NULL;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 207 vma_hpagesize = vma_kernel_pagesize(dst_vma);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 208
60d4d2d2b40e44 Mike Kravetz 2017-02-22 209 /*
60d4d2d2b40e44 Mike Kravetz 2017-02-22 210 * Validate alignment based on huge page size
60d4d2d2b40e44 Mike Kravetz 2017-02-22 211 */
60d4d2d2b40e44 Mike Kravetz 2017-02-22 212 err = -EINVAL;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 213 if (dst_start & (vma_hpagesize - 1) || len & (vma_hpagesize - 1))
60d4d2d2b40e44 Mike Kravetz 2017-02-22 214 goto out_unlock;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 215
60d4d2d2b40e44 Mike Kravetz 2017-02-22 216 retry:
60d4d2d2b40e44 Mike Kravetz 2017-02-22 217 /*
60d4d2d2b40e44 Mike Kravetz 2017-02-22 218 * On routine entry dst_vma is set. If we had to drop mmap_sem and
60d4d2d2b40e44 Mike Kravetz 2017-02-22 219 * retry, dst_vma will be set to NULL and we must lookup again.
60d4d2d2b40e44 Mike Kravetz 2017-02-22 220 */
60d4d2d2b40e44 Mike Kravetz 2017-02-22 221 if (!dst_vma) {
27d02568f529e9 Mike Rapoport 2017-02-24 222 err = -ENOENT;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 223 dst_vma = find_vma(dst_mm, dst_start);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 224 if (!dst_vma || !is_vm_hugetlb_page(dst_vma))
60d4d2d2b40e44 Mike Kravetz 2017-02-22 225 goto out_unlock;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 226 /*
29ec90660d68bb Andrea Arcangeli 2018-11-30 227 * Check the vma is registered in uffd, this is
29ec90660d68bb Andrea Arcangeli 2018-11-30 228 * required to enforce the VM_MAYWRITE check done at
29ec90660d68bb Andrea Arcangeli 2018-11-30 229 * uffd registration time.
60d4d2d2b40e44 Mike Kravetz 2017-02-22 230 */
27d02568f529e9 Mike Rapoport 2017-02-24 231 if (!dst_vma->vm_userfaultfd_ctx.ctx)
27d02568f529e9 Mike Rapoport 2017-02-24 232 goto out_unlock;
27d02568f529e9 Mike Rapoport 2017-02-24 233
60d4d2d2b40e44 Mike Kravetz 2017-02-22 234 if (dst_start < dst_vma->vm_start ||
60d4d2d2b40e44 Mike Kravetz 2017-02-22 235 dst_start + len > dst_vma->vm_end)
60d4d2d2b40e44 Mike Kravetz 2017-02-22 236 goto out_unlock;
1c9e8def43a345 Mike Kravetz 2017-02-22 237
27d02568f529e9 Mike Rapoport 2017-02-24 238 err = -EINVAL;
27d02568f529e9 Mike Rapoport 2017-02-24 239 if (vma_hpagesize != vma_kernel_pagesize(dst_vma))
27d02568f529e9 Mike Rapoport 2017-02-24 240 goto out_unlock;
27d02568f529e9 Mike Rapoport 2017-02-24 241
1c9e8def43a345 Mike Kravetz 2017-02-22 242 vm_shared = dst_vma->vm_flags & VM_SHARED;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 243 }
60d4d2d2b40e44 Mike Kravetz 2017-02-22 244
60d4d2d2b40e44 Mike Kravetz 2017-02-22 245 if (WARN_ON(dst_addr & (vma_hpagesize - 1) ||
60d4d2d2b40e44 Mike Kravetz 2017-02-22 246 (len - copied) & (vma_hpagesize - 1)))
60d4d2d2b40e44 Mike Kravetz 2017-02-22 247 goto out_unlock;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 248
60d4d2d2b40e44 Mike Kravetz 2017-02-22 249 /*
1c9e8def43a345 Mike Kravetz 2017-02-22 250 * If not shared, ensure the dst_vma has a anon_vma.
60d4d2d2b40e44 Mike Kravetz 2017-02-22 251 */
60d4d2d2b40e44 Mike Kravetz 2017-02-22 252 err = -ENOMEM;
1c9e8def43a345 Mike Kravetz 2017-02-22 253 if (!vm_shared) {
60d4d2d2b40e44 Mike Kravetz 2017-02-22 254 if (unlikely(anon_vma_prepare(dst_vma)))
60d4d2d2b40e44 Mike Kravetz 2017-02-22 255 goto out_unlock;
1c9e8def43a345 Mike Kravetz 2017-02-22 256 }
60d4d2d2b40e44 Mike Kravetz 2017-02-22 257
60d4d2d2b40e44 Mike Kravetz 2017-02-22 258 while (src_addr < src_start + len) {
60d4d2d2b40e44 Mike Kravetz 2017-02-22 259 pte_t dst_pteval;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 260
60d4d2d2b40e44 Mike Kravetz 2017-02-22 261 BUG_ON(dst_addr >= dst_start + len);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 @262 VM_BUG_ON(dst_addr & ~huge_page_mask(h));
60d4d2d2b40e44 Mike Kravetz 2017-02-22 263
60d4d2d2b40e44 Mike Kravetz 2017-02-22 264 /*
ddeaab32a89f04 Mike Kravetz 2019-01-08 265 * Serialize via hugetlb_fault_mutex
60d4d2d2b40e44 Mike Kravetz 2017-02-22 266 */
b43a9990055958 Mike Kravetz 2018-12-28 267 idx = linear_page_index(dst_vma, dst_addr);
ddeaab32a89f04 Mike Kravetz 2019-01-08 268 mapping = dst_vma->vm_file->f_mapping;
2b52c262f0e75d Wei Yang 2019-10-05 269 hash = hugetlb_fault_mutex_hash(mapping, idx, dst_addr);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 270 mutex_lock(&hugetlb_fault_mutex_table[hash]);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 271
60d4d2d2b40e44 Mike Kravetz 2017-02-22 272 err = -ENOMEM;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 273 dst_pte = huge_pte_alloc(dst_mm, dst_addr, huge_page_size(h));
60d4d2d2b40e44 Mike Kravetz 2017-02-22 274 if (!dst_pte) {
60d4d2d2b40e44 Mike Kravetz 2017-02-22 275 mutex_unlock(&hugetlb_fault_mutex_table[hash]);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 276 goto out_unlock;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 277 }
60d4d2d2b40e44 Mike Kravetz 2017-02-22 278
60d4d2d2b40e44 Mike Kravetz 2017-02-22 279 err = -EEXIST;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 280 dst_pteval = huge_ptep_get(dst_pte);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 281 if (!huge_pte_none(dst_pteval)) {
60d4d2d2b40e44 Mike Kravetz 2017-02-22 282 mutex_unlock(&hugetlb_fault_mutex_table[hash]);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 283 goto out_unlock;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 284 }
60d4d2d2b40e44 Mike Kravetz 2017-02-22 285
60d4d2d2b40e44 Mike Kravetz 2017-02-22 286 err = hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma,
60d4d2d2b40e44 Mike Kravetz 2017-02-22 287 dst_addr, src_addr, &page);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 288
60d4d2d2b40e44 Mike Kravetz 2017-02-22 289 mutex_unlock(&hugetlb_fault_mutex_table[hash]);
1c9e8def43a345 Mike Kravetz 2017-02-22 290 vm_alloc_shared = vm_shared;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 291
60d4d2d2b40e44 Mike Kravetz 2017-02-22 292 cond_resched();
60d4d2d2b40e44 Mike Kravetz 2017-02-22 293
9e368259ad9883 Andrea Arcangeli 2018-11-30 294 if (unlikely(err == -ENOENT)) {
60d4d2d2b40e44 Mike Kravetz 2017-02-22 295 up_read(&dst_mm->mmap_sem);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 296 BUG_ON(!page);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 297
60d4d2d2b40e44 Mike Kravetz 2017-02-22 298 err = copy_huge_page_from_user(page,
60d4d2d2b40e44 Mike Kravetz 2017-02-22 299 (const void __user *)src_addr,
810a56b943e265 Mike Kravetz 2017-02-22 300 pages_per_huge_page(h), true);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 301 if (unlikely(err)) {
60d4d2d2b40e44 Mike Kravetz 2017-02-22 302 err = -EFAULT;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 303 goto out;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 304 }
60d4d2d2b40e44 Mike Kravetz 2017-02-22 305 down_read(&dst_mm->mmap_sem);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 306
60d4d2d2b40e44 Mike Kravetz 2017-02-22 307 dst_vma = NULL;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 308 goto retry;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 309 } else
60d4d2d2b40e44 Mike Kravetz 2017-02-22 310 BUG_ON(page);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 311
60d4d2d2b40e44 Mike Kravetz 2017-02-22 312 if (!err) {
60d4d2d2b40e44 Mike Kravetz 2017-02-22 313 dst_addr += vma_hpagesize;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 314 src_addr += vma_hpagesize;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 315 copied += vma_hpagesize;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 316
60d4d2d2b40e44 Mike Kravetz 2017-02-22 317 if (fatal_signal_pending(current))
60d4d2d2b40e44 Mike Kravetz 2017-02-22 318 err = -EINTR;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 319 }
60d4d2d2b40e44 Mike Kravetz 2017-02-22 320 if (err)
60d4d2d2b40e44 Mike Kravetz 2017-02-22 321 break;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 322 }
60d4d2d2b40e44 Mike Kravetz 2017-02-22 323
60d4d2d2b40e44 Mike Kravetz 2017-02-22 324 out_unlock:
60d4d2d2b40e44 Mike Kravetz 2017-02-22 325 up_read(&dst_mm->mmap_sem);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 326 out:
21205bf8f77b23 Mike Kravetz 2017-02-22 327 if (page) {
21205bf8f77b23 Mike Kravetz 2017-02-22 328 /*
21205bf8f77b23 Mike Kravetz 2017-02-22 329 * We encountered an error and are about to free a newly
1c9e8def43a345 Mike Kravetz 2017-02-22 330 * allocated huge page.
1c9e8def43a345 Mike Kravetz 2017-02-22 331 *
1c9e8def43a345 Mike Kravetz 2017-02-22 332 * Reservation handling is very subtle, and is different for
1c9e8def43a345 Mike Kravetz 2017-02-22 333 * private and shared mappings. See the routine
1c9e8def43a345 Mike Kravetz 2017-02-22 334 * restore_reserve_on_error for details. Unfortunately, we
1c9e8def43a345 Mike Kravetz 2017-02-22 335 * can not call restore_reserve_on_error now as it would
1c9e8def43a345 Mike Kravetz 2017-02-22 336 * require holding mmap_sem.
1c9e8def43a345 Mike Kravetz 2017-02-22 337 *
1c9e8def43a345 Mike Kravetz 2017-02-22 338 * If a reservation for the page existed in the reservation
1c9e8def43a345 Mike Kravetz 2017-02-22 339 * map of a private mapping, the map was modified to indicate
1c9e8def43a345 Mike Kravetz 2017-02-22 340 * the reservation was consumed when the page was allocated.
1c9e8def43a345 Mike Kravetz 2017-02-22 341 * We clear the PagePrivate flag now so that the global
21205bf8f77b23 Mike Kravetz 2017-02-22 342 * reserve count will not be incremented in free_huge_page.
21205bf8f77b23 Mike Kravetz 2017-02-22 343 * The reservation map will still indicate the reservation
21205bf8f77b23 Mike Kravetz 2017-02-22 344 * was consumed and possibly prevent later page allocation.
1c9e8def43a345 Mike Kravetz 2017-02-22 345 * This is better than leaking a global reservation. If no
1c9e8def43a345 Mike Kravetz 2017-02-22 346 * reservation existed, it is still safe to clear PagePrivate
1c9e8def43a345 Mike Kravetz 2017-02-22 347 * as no adjustments to reservation counts were made during
1c9e8def43a345 Mike Kravetz 2017-02-22 348 * allocation.
1c9e8def43a345 Mike Kravetz 2017-02-22 349 *
1c9e8def43a345 Mike Kravetz 2017-02-22 350 * The reservation map for shared mappings indicates which
1c9e8def43a345 Mike Kravetz 2017-02-22 351 * pages have reservations. When a huge page is allocated
1c9e8def43a345 Mike Kravetz 2017-02-22 352 * for an address with a reservation, no change is made to
1c9e8def43a345 Mike Kravetz 2017-02-22 353 * the reserve map. In this case PagePrivate will be set
1c9e8def43a345 Mike Kravetz 2017-02-22 354 * to indicate that the global reservation count should be
1c9e8def43a345 Mike Kravetz 2017-02-22 355 * incremented when the page is freed. This is the desired
1c9e8def43a345 Mike Kravetz 2017-02-22 356 * behavior. However, when a huge page is allocated for an
1c9e8def43a345 Mike Kravetz 2017-02-22 357 * address without a reservation a reservation entry is added
1c9e8def43a345 Mike Kravetz 2017-02-22 358 * to the reservation map, and PagePrivate will not be set.
1c9e8def43a345 Mike Kravetz 2017-02-22 359 * When the page is freed, the global reserve count will NOT
1c9e8def43a345 Mike Kravetz 2017-02-22 360 * be incremented and it will appear as though we have leaked
1c9e8def43a345 Mike Kravetz 2017-02-22 361 * reserved page. In this case, set PagePrivate so that the
1c9e8def43a345 Mike Kravetz 2017-02-22 362 * global reserve count will be incremented to match the
1c9e8def43a345 Mike Kravetz 2017-02-22 363 * reservation map entry which was created.
1c9e8def43a345 Mike Kravetz 2017-02-22 364 *
1c9e8def43a345 Mike Kravetz 2017-02-22 365 * Note that vm_alloc_shared is based on the flags of the vma
1c9e8def43a345 Mike Kravetz 2017-02-22 366 * for which the page was originally allocated. dst_vma could
1c9e8def43a345 Mike Kravetz 2017-02-22 367 * be different or NULL on error.
21205bf8f77b23 Mike Kravetz 2017-02-22 368 */
1c9e8def43a345 Mike Kravetz 2017-02-22 369 if (vm_alloc_shared)
1c9e8def43a345 Mike Kravetz 2017-02-22 370 SetPagePrivate(page);
1c9e8def43a345 Mike Kravetz 2017-02-22 371 else
21205bf8f77b23 Mike Kravetz 2017-02-22 372 ClearPagePrivate(page);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 373 put_page(page);
21205bf8f77b23 Mike Kravetz 2017-02-22 374 }
60d4d2d2b40e44 Mike Kravetz 2017-02-22 375 BUG_ON(copied < 0);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 376 BUG_ON(err > 0);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 377 BUG_ON(!copied && !err);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 378 return copied ? copied : err;
60d4d2d2b40e44 Mike Kravetz 2017-02-22 379 }
60d4d2d2b40e44 Mike Kravetz 2017-02-22 380 #else /* !CONFIG_HUGETLB_PAGE */
60d4d2d2b40e44 Mike Kravetz 2017-02-22 381 /* fail at build time if gcc attempts to use this */
60d4d2d2b40e44 Mike Kravetz 2017-02-22 382 extern ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
60d4d2d2b40e44 Mike Kravetz 2017-02-22 383 struct vm_area_struct *dst_vma,
60d4d2d2b40e44 Mike Kravetz 2017-02-22 384 unsigned long dst_start,
60d4d2d2b40e44 Mike Kravetz 2017-02-22 385 unsigned long src_start,
60d4d2d2b40e44 Mike Kravetz 2017-02-22 386 unsigned long len,
60d4d2d2b40e44 Mike Kravetz 2017-02-22 387 bool zeropage);
60d4d2d2b40e44 Mike Kravetz 2017-02-22 388 #endif /* CONFIG_HUGETLB_PAGE */
60d4d2d2b40e44 Mike Kravetz 2017-02-22 389

:::::: The code at line 262 was first introduced by commit
:::::: 60d4d2d2b40e44cd36bfb6049e8d9e2055a24f8a userfaultfd: hugetlbfs: add __mcopy_atomic_hugetlb for huge page UFFDIO_COPY

:::::: TO: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

---
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