tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: fbfb361fe93de1a562df2ace860f64c4067abfdc commit: 8f4f66a9d851f366942e8ee319292e41ad2baa95 [3135/3135] gmem: support swapping heterogeneous memory config: arm64-randconfig-001-20251112 (https://download.01.org/0day-ci/archive/20251113/202511130834.0qWsUngh-lkp@i...) compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 996639d6ebb86ff15a8c99b67f1c2e2117636ae7) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251113/202511130834.0qWsUngh-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202511130834.0qWsUngh-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from <built-in>:3: In file included from include/linux/compiler_types.h:150: include/linux/compiler-clang.h:33:9: warning: '__SANITIZE_ADDRESS__' macro redefined [-Wmacro-redefined] 33 | #define __SANITIZE_ADDRESS__ | ^ <built-in>:368:9: note: previous definition is here 368 | #define __SANITIZE_ADDRESS__ 1 | ^

...

mm/gmem_phys.c:245:19: warning: no previous prototype for function 'gm_evict_page_locked' [-Wmissing-prototypes] 245 | enum gm_evict_ret gm_evict_page_locked(struct gm_page *gm_page) | ^ mm/gmem_phys.c:245:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 245 | enum gm_evict_ret gm_evict_page_locked(struct gm_page *gm_page) | ^ | static mm/gmem_phys.c:345:19: warning: no previous prototype for function 'gm_evict_page' [-Wmissing-prototypes] 345 | enum gm_evict_ret gm_evict_page(struct gm_page *gm_page) | ^ mm/gmem_phys.c:345:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 345 | enum gm_evict_ret gm_evict_page(struct gm_page *gm_page) | ^ | static 3 warnings generated.

vim +/gm_evict_page_locked +245 mm/gmem_phys.c 244

245 enum gm_evict_ret gm_evict_page_locked(struct gm_page *gm_page) 246 { 247 struct gm_dev *gm_dev; 248 struct gm_mapping *gm_mapping; 249 struct vm_area_struct *vma; 250 struct mm_struct *mm; 251 struct page *page; 252 struct device *dma_dev; 253 unsigned long va; 254 struct folio *folio = NULL; 255 struct gm_fault_t gmf = { 256 .size = HPAGE_SIZE, 257 .copy = true 258 }; 259 enum gm_evict_ret ret = GM_EVICT_SUCCESS; 260 enum gm_ret gm_ret; 261 262 gm_dev = get_gm_dev(gm_page->hnid); 263 if (!gm_dev) 264 return GM_EVICT_DEVERR; 265 266 spin_lock(&gm_page->rmap_lock); 267 if (!gm_page->mm) { 268 /* Evicting gm_page conflicts with unmap.*/ 269 ret = GM_EVICT_UNMAP; 270 goto rmap_unlock; 271 } 272 273 mm = gm_page->mm; 274 va = gm_page->va; 275 vma = find_vma(mm, va); 276 if (!vma || !vma->vm_obj) { 277 gmem_err("%s: cannot find vma or vma->vm_obj is null for va %lx", __func__, va); 278 ret = GM_EVICT_UNMAP; 279 goto rmap_unlock; 280 } 281 282 gm_mapping = vm_object_lookup(vma->vm_obj, va); 283 if (!gm_mapping) { 284 gmem_err("%s: no gm_mapping for va %lx", __func__, va); 285 ret = GM_EVICT_UNMAP; 286 goto rmap_unlock; 287 } 288 289 spin_unlock(&gm_page->rmap_lock); 290 291 mutex_lock(&gm_mapping->lock); 292 if (!gm_mapping_device(gm_mapping)) { 293 /* Evicting gm_page conflicts with unmap.*/ 294 ret = GM_EVICT_UNMAP; 295 goto gm_mapping_unlock; 296 } 297 298 if (gm_mapping->gm_page != gm_page) { 299 /* gm_mapping maps to another gm_page. */ 300 ret = GM_EVICT_UNMAP; 301 goto gm_mapping_unlock; 302 } 303 304 folio = vma_alloc_folio(GFP_TRANSHUGE, HPAGE_PMD_ORDER, vma, va, true); 305 if (!folio) { 306 gmem_err("%s: allocate host page failed.", __func__); 307 ret = GM_EVICT_FALLBACK; 308 goto gm_mapping_unlock; 309 } 310 page = &folio->page; 311 312 gmf.mm = mm; 313 gmf.va = va; 314 gmf.dev = gm_dev; 315 gmf.pfn = gm_page->dev_pfn; 316 dma_dev = gm_dev->dma_dev; 317 gmf.dma_addr = dma_map_page(dma_dev, page, 0, HPAGE_SIZE, DMA_BIDIRECTIONAL); 318 if (dma_mapping_error(dma_dev, gmf.dma_addr)) { 319 gmem_err("%s: dma map failed.", __func__); 320 ret = GM_EVICT_FALLBACK; 321 goto gm_mapping_unlock; 322 } 323 324 gm_ret = gm_dev->mmu->peer_unmap(&gmf); 325 if (gm_ret != GM_RET_SUCCESS) { 326 gmem_err("%s: peer_unmap failed.", __func__); 327 ret = GM_EVICT_DEVERR; 328 goto dma_unmap; 329 } 330 331 gm_mapping_flags_set(gm_mapping, GM_MAPPING_CPU); 332 gm_page_remove_rmap(gm_page); 333 gm_mapping->page = page; 334 put_gm_page(gm_page); 335 dma_unmap: 336 dma_unmap_page(dma_dev, gmf.dma_addr, HPAGE_SIZE, DMA_BIDIRECTIONAL); 337 gm_mapping_unlock: 338 mutex_unlock(&gm_mapping->lock); 339 return ret; 340 rmap_unlock: 341 spin_unlock(&gm_page->rmap_lock); 342 return ret; 343 } 344 345 enum gm_evict_ret gm_evict_page(struct gm_page *gm_page) 346 { 347 struct mm_struct *mm = gm_page->mm; 348 enum gm_evict_ret ret; 349 350 mmap_read_lock(mm); 351 ret = gm_evict_page_locked(gm_page); 352 mmap_read_unlock(mm); 353 return ret; 354 } 355

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