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SubjectRe: [PATCH 6/7] mm/gup: Combine parameters into struct
Hi Keith,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.19-rc4 next-20180919]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Keith-Busch/mm-faster-get-user-pages/20180920-184931
config: arm-oxnas_v6_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=7.2.0 make.cross ARCH=arm

All errors (new ones prefixed by >>):

In file included from include/linux/mm.h:506:0,
from mm/gup.c:6:
include/linux/huge_mm.h:344:53: warning: 'struct gup_context' declared inside parameter list will not be visible outside of this definition or declaration
static inline struct page *follow_devmap_pmd(struct gup_context *ctx, pmd_t *pmd)
^~~~~~~~~~~
include/linux/huge_mm.h:349:53: warning: 'struct gup_context' declared inside parameter list will not be visible outside of this definition or declaration
static inline struct page *follow_devmap_pud(struct gup_context *ctx, pud_t *pud)
^~~~~~~~~~~
mm/gup.c: In function 'follow_pmd_mask':
>> mm/gup.c:233:34: error: macro "follow_huge_pd" passed 5 arguments, but takes just 3
ctx->flags, PGDIR_SHIFT);
^
>> mm/gup.c:231:10: error: 'follow_huge_pd' undeclared (first use in this function); did you mean 'follow_page_pte'?
page = follow_huge_pd(ctx->vma, ctx->address,
^~~~~~~~~~~~~~
follow_page_pte
mm/gup.c:231:10: note: each undeclared identifier is reported only once for each function it appears in
>> mm/gup.c:257:28: error: passing argument 1 of 'follow_devmap_pmd' from incompatible pointer type [-Werror=incompatible-pointer-types]
page = follow_devmap_pmd(ctx, pmd);
^~~
In file included from include/linux/mm.h:506:0,
from mm/gup.c:6:
include/linux/huge_mm.h:344:28: note: expected 'struct gup_context *' but argument is of type 'struct follow_page_context *'
static inline struct page *follow_devmap_pmd(struct gup_context *ctx, pmd_t *pmd)
^~~~~~~~~~~~~~~~~
mm/gup.c: In function 'follow_pud_mask':
mm/gup.c:333:32: error: macro "follow_huge_pd" passed 5 arguments, but takes just 3
ctx->flags, PUD_SHIFT);
^
mm/gup.c:331:10: error: 'follow_huge_pd' undeclared (first use in this function); did you mean 'follow_page_pte'?
page = follow_huge_pd(ctx->vma, ctx->address,
^~~~~~~~~~~~~~
follow_page_pte
>> mm/gup.c:340:28: error: passing argument 1 of 'follow_devmap_pud' from incompatible pointer type [-Werror=incompatible-pointer-types]
page = follow_devmap_pud(ctx, pud);
^~~
In file included from include/linux/mm.h:506:0,
from mm/gup.c:6:
include/linux/huge_mm.h:349:28: note: expected 'struct gup_context *' but argument is of type 'struct follow_page_context *'
static inline struct page *follow_devmap_pud(struct gup_context *ctx, pud_t *pud)
^~~~~~~~~~~~~~~~~
mm/gup.c: In function 'follow_p4d_mask':
mm/gup.c:366:32: error: macro "follow_huge_pd" passed 5 arguments, but takes just 3
ctx->flags, P4D_SHIFT);
^
mm/gup.c:364:10: error: 'follow_huge_pd' undeclared (first use in this function); did you mean 'follow_page_pte'?
page = follow_huge_pd(ctx->vma, ctx->address,
^~~~~~~~~~~~~~
follow_page_pte
mm/gup.c: In function 'follow_page_mask':
mm/gup.c:414:34: error: macro "follow_huge_pd" passed 5 arguments, but takes just 3
ctx->flags, PGDIR_SHIFT);
^
mm/gup.c:412:10: error: 'follow_huge_pd' undeclared (first use in this function); did you mean 'follow_page_pte'?
page = follow_huge_pd(ctx->vma, ctx->address,
^~~~~~~~~~~~~~
follow_page_pte
cc1: some warnings being treated as errors

vim +/follow_huge_pd +233 mm/gup.c

208
209 static struct page *follow_pmd_mask(struct follow_page_context *ctx, pud_t *pudp)
210 {
211 pmd_t *pmd, pmdval;
212 spinlock_t *ptl;
213 struct page *page;
214 struct mm_struct *mm = ctx->vma->vm_mm;
215
216 pmd = pmd_offset(pudp, ctx->address);
217 /*
218 * The READ_ONCE() will stabilize the pmdval in a register or
219 * on the stack so that it will stop changing under the code.
220 */
221 pmdval = READ_ONCE(*pmd);
222 if (pmd_none(pmdval))
223 return no_page_table(ctx);
224 if (pmd_huge(pmdval) && ctx->vma->vm_flags & VM_HUGETLB) {
225 page = follow_huge_pmd(mm, ctx->address, pmd, ctx->flags);
226 if (page)
227 return page;
228 return no_page_table(ctx);
229 }
230 if (is_hugepd(__hugepd(pmd_val(pmdval)))) {
> 231 page = follow_huge_pd(ctx->vma, ctx->address,
232 __hugepd(pmd_val(pmdval)),
> 233 ctx->flags, PGDIR_SHIFT);
234 if (page)
235 return page;
236 return no_page_table(ctx);
237 }
238 retry:
239 if (!pmd_present(pmdval)) {
240 if (likely(!(ctx->flags & FOLL_MIGRATION)))
241 return no_page_table(ctx);
242 VM_BUG_ON(thp_migration_supported() &&
243 !is_pmd_migration_entry(pmdval));
244 if (is_pmd_migration_entry(pmdval))
245 pmd_migration_entry_wait(mm, pmd);
246 pmdval = READ_ONCE(*pmd);
247 /*
248 * MADV_DONTNEED may convert the pmd to null because
249 * mmap_sem is held in read mode
250 */
251 if (pmd_none(pmdval))
252 return no_page_table(ctx);
253 goto retry;
254 }
255 if (pmd_devmap(pmdval)) {
256 ptl = pmd_lock(mm, pmd);
> 257 page = follow_devmap_pmd(ctx, pmd);
258 spin_unlock(ptl);
259 if (page)
260 return page;
261 }
262 if (likely(!pmd_trans_huge(pmdval)))
263 return follow_page_pte(ctx, pmd);
264
265 if ((ctx->flags & FOLL_NUMA) && pmd_protnone(pmdval))
266 return no_page_table(ctx);
267
268 retry_locked:
269 ptl = pmd_lock(mm, pmd);
270 if (unlikely(pmd_none(*pmd))) {
271 spin_unlock(ptl);
272 return no_page_table(ctx);
273 }
274 if (unlikely(!pmd_present(*pmd))) {
275 spin_unlock(ptl);
276 if (likely(!(ctx->flags & FOLL_MIGRATION)))
277 return no_page_table(ctx);
278 pmd_migration_entry_wait(mm, pmd);
279 goto retry_locked;
280 }
281 if (unlikely(!pmd_trans_huge(*pmd))) {
282 spin_unlock(ptl);
283 return follow_page_pte(ctx, pmd);
284 }
285 if (ctx->flags & FOLL_SPLIT) {
286 int ret;
287 page = pmd_page(*pmd);
288 if (is_huge_zero_page(page)) {
289 spin_unlock(ptl);
290 ret = 0;
291 split_huge_pmd(ctx->vma, pmd, ctx->address);
292 if (pmd_trans_unstable(pmd))
293 ret = -EBUSY;
294 } else {
295 get_page(page);
296 spin_unlock(ptl);
297 lock_page(page);
298 ret = split_huge_page(page);
299 unlock_page(page);
300 put_page(page);
301 if (pmd_none(*pmd))
302 return no_page_table(ctx);
303 }
304
305 return ret ? ERR_PTR(ret) :
306 follow_page_pte(ctx, pmd);
307 }
308 page = follow_trans_huge_pmd(ctx->vma, ctx->address, pmd, ctx->flags);
309 spin_unlock(ptl);
310 ctx->page_mask = HPAGE_PMD_NR - 1;
311 return page;
312 }
313
314 static struct page *follow_pud_mask(struct follow_page_context *ctx, p4d_t *p4dp)
315 {
316 pud_t *pud;
317 spinlock_t *ptl;
318 struct page *page;
319 struct mm_struct *mm = ctx->vma->vm_mm;
320
321 pud = pud_offset(p4dp, ctx->address);
322 if (pud_none(*pud))
323 return no_page_table(ctx);
324 if (pud_huge(*pud) && ctx->vma->vm_flags & VM_HUGETLB) {
325 page = follow_huge_pud(mm, ctx->address, pud, ctx->flags);
326 if (page)
327 return page;
328 return no_page_table(ctx);
329 }
330 if (is_hugepd(__hugepd(pud_val(*pud)))) {
331 page = follow_huge_pd(ctx->vma, ctx->address,
332 __hugepd(pud_val(*pud)),
> 333 ctx->flags, PUD_SHIFT);
334 if (page)
335 return page;
336 return no_page_table(ctx);
337 }
338 if (pud_devmap(*pud)) {
339 ptl = pud_lock(mm, pud);
> 340 page = follow_devmap_pud(ctx, pud);
341 spin_unlock(ptl);
342 if (page)
343 return page;
344 }
345 if (unlikely(pud_bad(*pud)))
346 return no_page_table(ctx);
347
348 return follow_pmd_mask(ctx, pud);
349 }
350

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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