Re: [PATCH] dma-pool: don't allocate DMA32 pool if no 32-bit memory

kernel test robot
2026-01-11T19:08:54Z

Hi Vladimir,

kernel test robot noticed the following build errors:

[auto build test ERROR on 7d0a66e4bb9081d75c82ec4957c50034cb0ea449]

url: https://github.com/intel-lab-lkp/linux/commits/Vladimir-Kondratiev/dma-pool-don-t-allocate-DMA32-pool-if-no-32-bit-memory/20260111-232732
base: 7d0a66e4bb9081d75c82ec4957c50034cb0ea449
patch link: https://lore.kernel.org/r/20260111152632.2133580-1-vladimir.kondratiev%40mobileye.com
patch subject: [PATCH] dma-pool: don't allocate DMA32 pool if no 32-bit memory
config: arc-randconfig-001-20260111 (https://download.01.org/0day-ci/archive/20260112/202601120212.Wm3uFeKw-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260112/202601120212.Wm3uFeKw-lkp@intel.com/reproduce)

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/202601120212.Wm3uFeKw-lkp@intel.com/

All errors (new ones prefixed by >>):

kernel/dma/pool.c: In function 'dma_atomic_pool_init':
>> kernel/dma/pool.c:212:39: error: 'phys_ram_base' undeclared (first use in this function); did you mean 'phys_to_page'?
if (IS_ENABLED(CONFIG_ZONE_DMA32) && phys_ram_base < BIT_ULL(32)) {
^~~~~~~~~~~~~
phys_to_page
kernel/dma/pool.c:212:39: note: each undeclared identifier is reported only once for each function it appears in

vim +212 kernel/dma/pool.c

186
187 static int __init dma_atomic_pool_init(void)
188 {
189 int ret = 0;
190
191 /*
192 * If coherent_pool was not used on the command line, default the pool
193 * sizes to 128KB per 1GB of memory, min 128KB, max MAX_PAGE_ORDER.
194 */
195 if (!atomic_pool_size) {
196 unsigned long pages = totalram_pages() / (SZ_1G / SZ_128K);
197 pages = min_t(unsigned long, pages, MAX_ORDER_NR_PAGES);
198 atomic_pool_size = max_t(size_t, pages << PAGE_SHIFT, SZ_128K);
199 }
200 INIT_WORK(&atomic_pool_work, atomic_pool_work_fn);
201
202 atomic_pool_kernel = __dma_atomic_pool_init(atomic_pool_size,
203 GFP_KERNEL);
204 if (!atomic_pool_kernel)
205 ret = -ENOMEM;
206 if (has_managed_dma()) {
207 atomic_pool_dma = __dma_atomic_pool_init(atomic_pool_size,
208 GFP_KERNEL | GFP_DMA);
209 if (!atomic_pool_dma)
210 ret = -ENOMEM;
211 }
> 212 if (IS_ENABLED(CONFIG_ZONE_DMA32) && phys_ram_base < BIT_ULL(32)) {
213 atomic_pool_dma32 = __dma_atomic_pool_init(atomic_pool_size,
214 GFP_KERNEL | GFP_DMA32);
215 if (!atomic_pool_dma32)
216 ret = -ENOMEM;
217 }
218
219 dma_atomic_pool_debugfs_init();
220 return ret;
221 }
222 postcore_initcall(dma_atomic_pool_init);
223

--
0-DAY CI Kernel Test Service