Hi Jiri,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-misc/drm-misc-next] [also build test ERROR on drm-tip/drm-tip trace/for-next linus/master v6.19] [cannot apply to next-20260209] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Jiri-Pirko/dma-mapping-avoid-... base: https://gitlab.freedesktop.org/drm/misc/kernel.git drm-misc-next patch link: https://lore.kernel.org/r/20260209153809.250835-6-jiri%40resnulli.us patch subject: [PATCH 5/5] dma-buf: heaps: system: add an option to allocate explicitly decrypted memory config: s390-allyesconfig (https://download.01.org/0day-ci/archive/20260211/202602110149.tBUPP0bh-lkp@i...) compiler: s390-linux-gcc (GCC) 15.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260211/202602110149.tBUPP0bh-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/202602110149.tBUPP0bh-lkp@intel.com/

All errors (new ones prefixed by >>):

drivers/dma-buf/heaps/system_heap.c: In function 'system_heap_set_page_decrypted':

...

drivers/dma-buf/heaps/system_heap.c:66:15: error: implicit declaration of function 'set_memory_decrypted' [-Wimplicit-function-declaration]

66 | ret = set_memory_decrypted(addr, nr_pages); | ^~~~~~~~~~~~~~~~~~~~ drivers/dma-buf/heaps/system_heap.c: In function 'system_heap_set_page_encrypted':

...

drivers/dma-buf/heaps/system_heap.c:80:15: error: implicit declaration of function 'set_memory_encrypted' [-Wimplicit-function-declaration]

80 | ret = set_memory_encrypted(addr, nr_pages); | ^~~~~~~~~~~~~~~~~~~~

vim +/set_memory_decrypted +66 drivers/dma-buf/heaps/system_heap.c

59 60 static int system_heap_set_page_decrypted(struct page *page) 61 { 62 unsigned long addr = (unsigned long)page_address(page); 63 unsigned int nr_pages = 1 << compound_order(page); 64 int ret; 65

66 ret = set_memory_decrypted(addr, nr_pages);

67 if (ret) 68 pr_warn_ratelimited("dma-buf system heap: failed to decrypt page at %p\n", 69 page_address(page)); 70 71 return ret; 72 } 73 74 static int system_heap_set_page_encrypted(struct page *page) 75 { 76 unsigned long addr = (unsigned long)page_address(page); 77 unsigned int nr_pages = 1 << compound_order(page); 78 int ret; 79

80 ret = set_memory_encrypted(addr, nr_pages);

81 if (ret) 82 pr_warn_ratelimited("dma-buf system heap: failed to re-encrypt page at %p, leaking memory\n", 83 page_address(page)); 84 85 return ret; 86 } 87