[PATCH v8 4/9] drm/ttm: Add ttm_bo_kmap_try_from_panic()
kernel test robot
lkp at intel.com
Fri Jun 6 19:46:55 UTC 2025
Hi Jocelyn,
kernel test robot noticed the following build warnings:
[auto build test WARNING on 7247efca0dcbc8ac6147db9200ed1549c0662465]
url: https://github.com/intel-lab-lkp/linux/commits/Jocelyn-Falempe/drm-i915-fbdev-Add-intel_fbdev_get_map/20250606-200804
base: 7247efca0dcbc8ac6147db9200ed1549c0662465
patch link: https://lore.kernel.org/r/20250606120519.753928-5-jfalempe%40redhat.com
patch subject: [PATCH v8 4/9] drm/ttm: Add ttm_bo_kmap_try_from_panic()
config: x86_64-buildonly-randconfig-001-20250607 (https://download.01.org/0day-ci/archive/20250607/202506070340.P5oZoRwh-lkp@intel.com/config)
compiler: clang version 20.1.2 (https://github.com/llvm/llvm-project 58df0ef89dd64126512e4ee27b4ac3fd8ddf6247)
rustc: rustc 1.78.0 (9b00956e5 2024-04-29)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250607/202506070340.P5oZoRwh-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202506070340.P5oZoRwh-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> drivers/gpu/drm/ttm/ttm_bo_util.c:381: warning: Cannot understand *
on line 381 - I thought it was a doc line
vim +381 drivers/gpu/drm/ttm/ttm_bo_util.c
379
380 /**
> 381 *
382 * ttm_bo_kmap_try_from_panic
383 *
384 * @bo: The buffer object
385 * @page: The page to map
386 *
387 * Sets up a kernel virtual mapping using kmap_local_page_try_from_panic().
388 * This can safely be called from the panic handler, if you make sure the bo
389 * is the one being displayed, so is properly allocated, and won't be modified.
390 *
391 * Returns the vaddr, that you can use to write to the bo, and that you should
392 * pass to kunmap_local() when you're done with this page, or NULL if the bo
393 * is in iomem.
394 */
395 void *ttm_bo_kmap_try_from_panic(struct ttm_buffer_object *bo, unsigned long page)
396 {
397 if (page + 1 > PFN_UP(bo->resource->size))
398 return NULL;
399
400 if (!bo->resource->bus.is_iomem && bo->ttm->pages && bo->ttm->pages[page])
401 return kmap_local_page_try_from_panic(bo->ttm->pages[page]);
402
403 return NULL;
404 }
405 EXPORT_SYMBOL(ttm_bo_kmap_try_from_panic);
406
--
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