tree: https://git.kernel.org/pub/scm/linux/kernel/git/nsaenz/linux-rpi.git v3d-enable-v2 head: 7b81f59eac536dd4cbe3eab95904e255f5b291e5 commit: cc4ec2eab7474381e57d4bbcf3c04595a729859b [9566/9840] mm: cma: print region name on failure config: mips-randconfig-r036-20210209 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/nsaenz/linux-rpi.git/comm... git remote add nsaenz-linux-rpi https://git.kernel.org/pub/scm/linux/kernel/git/nsaenz/linux-rpi.git git fetch --no-tags nsaenz-linux-rpi v3d-enable-v2 git checkout cc4ec2eab7474381e57d4bbcf3c04595a729859b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): __func__, cma->name, cma->count, ret); ^~~~~~~~~~ include/linux/printk.h:343:33: note: expanded from macro 'pr_err' printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ 1 warning generated. Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for SSB_EMBEDDED Depends on SSB && SSB_DRIVER_MIPS && SSB_PCICORE_HOSTMODE Selected by - BCM47XX_SSB && BCM47XX vim +504 mm/cma.c 415 416 /** 417 * cma_alloc() - allocate pages from contiguous area 418 * @cma: Contiguous memory region for which the allocation is performed. 419 * @count: Requested number of pages. 420 * @align: Requested alignment of pages (in PAGE_SIZE order). 421 * @no_warn: Avoid printing message about failed allocation 422 * 423 * This function allocates part of contiguous memory on specific 424 * contiguous memory area. 425 */ 426 struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align, 427 bool no_warn) 428 { 429 unsigned long mask, offset; 430 unsigned long pfn = -1; 431 unsigned long start = 0; 432 unsigned long bitmap_maxno, bitmap_no, bitmap_count; 433 size_t i; 434 struct page *page = NULL; 435 int ret = -ENOMEM; 436 437 if (!cma || !cma->count || !cma->bitmap) 438 return NULL; 439 440 pr_debug("%s(cma %p, count %zu, align %d)\n", __func__, (void *)cma, 441 count, align); 442 443 if (!count) 444 return NULL; 445 446 mask = cma_bitmap_aligned_mask(cma, align); 447 offset = cma_bitmap_aligned_offset(cma, align); 448 bitmap_maxno = cma_bitmap_maxno(cma); 449 bitmap_count = cma_bitmap_pages_to_bits(cma, count); 450 451 if (bitmap_count > bitmap_maxno) 452 return NULL; 453 454 for (;;) { 455 mutex_lock(&cma->lock); 456 bitmap_no = bitmap_find_next_zero_area_off(cma->bitmap, 457 bitmap_maxno, start, bitmap_count, mask, 458 offset); 459 if (bitmap_no >= bitmap_maxno) { 460 mutex_unlock(&cma->lock); 461 break; 462 } 463 bitmap_set(cma->bitmap, bitmap_no, bitmap_count); 464 /* 465 * It's safe to drop the lock here. We've marked this region for 466 * our exclusive use. If the migration fails we will take the 467 * lock again and unmark it. 468 */ 469 mutex_unlock(&cma->lock); 470 471 pfn = cma->base_pfn + (bitmap_no << cma->order_per_bit); 472 ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA, 473 GFP_KERNEL | (no_warn ? __GFP_NOWARN : 0)); 474 475 if (ret == 0) { 476 page = pfn_to_page(pfn); 477 break; 478 } 479 480 cma_clear_bitmap(cma, pfn, count); 481 if (ret != -EBUSY) 482 break; 483 484 pr_debug("%s(): memory range at %p is busy, retrying\n", 485 __func__, pfn_to_page(pfn)); 486 /* try again with a bit different memory target */ 487 start = bitmap_no + mask + 1; 488 } 489 490 trace_cma_alloc(pfn, page, count, align); 491 492 /* 493 * CMA can allocate multiple page blocks, which results in different 494 * blocks being marked with different tags. Reset the tags to ignore 495 * those page blocks. 496 */ 497 if (page) { 498 for (i = 0; i < count; i++) 499 page_kasan_tag_reset(page + i); 500 } 501 502 if (ret && !no_warn) { 503 pr_err("%s: %s: alloc failed, req-size: %zu pages, ret: %d\n", 505 cma_debug_show_areas(cma); 506 } 507 508 pr_debug("%s(): returned %p\n", __func__, page); 509 return page; 510 } 511 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org