Re: [PATCH 7/8] dma-buf: heaps: cma: Handle ECC flags
From: kernel test robot
Date: Thu May 16 2024 - 01:55:50 EST
Hi Maxime,
kernel test robot noticed the following build warnings:
[auto build test WARNING on a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6]
url: https://github.com/intel-lab-lkp/linux/commits/Maxime-Ripard/dma-buf-heaps-Introduce-a-new-heap-for-reserved-memory/20240515-215850
base: a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6
patch link: https://lore.kernel.org/r/20240515-dma-buf-ecc-heap-v1-7-54cbbd049511%40kernel.org
patch subject: [PATCH 7/8] dma-buf: heaps: cma: Handle ECC flags
config: mips-allmodconfig (https://download.01.org/0day-ci/archive/20240516/202405161341.XBePS2s0-lkp@xxxxxxxxx/config)
compiler: mips-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240516/202405161341.XBePS2s0-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405161341.XBePS2s0-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
drivers/dma-buf/heaps/cma_heap.c: In function 'cma_heap_allocate':
>> drivers/dma-buf/heaps/cma_heap.c:293:24: warning: returning 'int' from a function with return type 'struct dma_buf *' makes pointer from integer without a cast [-Wint-conversion]
293 | return -EINVAL;
| ^
drivers/dma-buf/heaps/cma_heap.c:296:24: warning: returning 'int' from a function with return type 'struct dma_buf *' makes pointer from integer without a cast [-Wint-conversion]
296 | return -EINVAL;
| ^
drivers/dma-buf/heaps/cma_heap.c: In function '__add_cma_heap':
drivers/dma-buf/heaps/cma_heap.c:386:13: error: implicit declaration of function 'of_memory_get_ecc_correction_bits' [-Werror=implicit-function-declaration]
386 | if (of_memory_get_ecc_correction_bits() > 0)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
vim +293 drivers/dma-buf/heaps/cma_heap.c
275
276 static struct dma_buf *cma_heap_allocate(struct dma_heap *heap,
277 unsigned long len,
278 unsigned long fd_flags,
279 unsigned long heap_flags)
280 {
281 struct cma_heap *cma_heap = dma_heap_get_drvdata(heap);
282 struct cma_heap_buffer *buffer;
283 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
284 size_t size = PAGE_ALIGN(len);
285 pgoff_t pagecount = size >> PAGE_SHIFT;
286 unsigned long align = get_order(size);
287 struct page *cma_pages;
288 struct dma_buf *dmabuf;
289 int ret = -ENOMEM;
290 pgoff_t pg;
291
292 if (!cma_heap->ecc_enabled && (heap_flags & DMA_HEAP_FLAG_ECC_PROTECTED))
> 293 return -EINVAL;
294
295 if (cma_heap->ecc_enabled && (heap_flags & DMA_HEAP_FLAG_ECC_UNPROTECTED))
296 return -EINVAL;
297
298 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
299 if (!buffer)
300 return ERR_PTR(-ENOMEM);
301
302 INIT_LIST_HEAD(&buffer->attachments);
303 mutex_init(&buffer->lock);
304 buffer->len = size;
305
306 if (align > CONFIG_CMA_ALIGNMENT)
307 align = CONFIG_CMA_ALIGNMENT;
308
309 cma_pages = cma_alloc(cma_heap->cma, pagecount, align, false);
310 if (!cma_pages)
311 goto free_buffer;
312
313 /* Clear the cma pages */
314 if (PageHighMem(cma_pages)) {
315 unsigned long nr_clear_pages = pagecount;
316 struct page *page = cma_pages;
317
318 while (nr_clear_pages > 0) {
319 void *vaddr = kmap_atomic(page);
320
321 memset(vaddr, 0, PAGE_SIZE);
322 kunmap_atomic(vaddr);
323 /*
324 * Avoid wasting time zeroing memory if the process
325 * has been killed by by SIGKILL
326 */
327 if (fatal_signal_pending(current))
328 goto free_cma;
329 page++;
330 nr_clear_pages--;
331 }
332 } else {
333 memset(page_address(cma_pages), 0, size);
334 }
335
336 buffer->pages = kmalloc_array(pagecount, sizeof(*buffer->pages), GFP_KERNEL);
337 if (!buffer->pages) {
338 ret = -ENOMEM;
339 goto free_cma;
340 }
341
342 for (pg = 0; pg < pagecount; pg++)
343 buffer->pages[pg] = &cma_pages[pg];
344
345 buffer->cma_pages = cma_pages;
346 buffer->heap = cma_heap;
347 buffer->pagecount = pagecount;
348
349 /* create the dmabuf */
350 exp_info.exp_name = dma_heap_get_name(heap);
351 exp_info.ops = &cma_heap_buf_ops;
352 exp_info.size = buffer->len;
353 exp_info.flags = fd_flags;
354 exp_info.priv = buffer;
355 dmabuf = dma_buf_export(&exp_info);
356 if (IS_ERR(dmabuf)) {
357 ret = PTR_ERR(dmabuf);
358 goto free_pages;
359 }
360 return dmabuf;
361
362 free_pages:
363 kfree(buffer->pages);
364 free_cma:
365 cma_release(cma_heap->cma, cma_pages, pagecount);
366 free_buffer:
367 kfree(buffer);
368
369 return ERR_PTR(ret);
370 }
371
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki