Hi Ling,

kernel test robot noticed the following build warnings:

[auto build test WARNING on char-misc/char-misc-testing] [also build test WARNING on char-misc/char-misc-next char-misc/char-misc-linus linus/master v6.16 next-20250806] [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/Ling-Xu/misc-fastrpc-Save-act... base: char-misc/char-misc-testing patch link: https://lore.kernel.org/r/20250806115114.688814-5-quic_lxu5%40quicinc.com patch subject: [PATCH v2 4/4] misc: fastrpc: Skip reference for DMA handles config: hexagon-randconfig-002-20250807 (https://download.01.org/0day-ci/archive/20250807/202508070731.S30957lV-lkp@i...) compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 7b8dea265e72c3037b6b1e54d5ab51b7e14f328b) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250807/202508070731.S30957lV-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/202508070731.S30957lV-lkp@intel.com/

All warnings (new ones prefixed by >>):

...

drivers/misc/fastrpc.c:368:30: warning: unused variable 'sess' [-Wunused-variable]

368 | struct fastrpc_session_ctx *sess = fl->sctx; | ^~~~ 1 warning generated.

vim +/sess +368 drivers/misc/fastrpc.c

c68cfb718c8f97 Srinivas Kandagatla 2019-02-08 363 8f6c1d8c4f0cc3 Vamsi Krishna Gattupalli 2022-02-14 364 8f6c1d8c4f0cc3 Vamsi Krishna Gattupalli 2022-02-14 365 static int fastrpc_map_lookup(struct fastrpc_user *fl, int fd, 1922c68c56c660 Ling Xu 2025-08-06 366 struct fastrpc_map **ppmap) c68cfb718c8f97 Srinivas Kandagatla 2019-02-08 367 { 9446fa1683a7e3 Abel Vesa 2022-11-24 @368 struct fastrpc_session_ctx *sess = fl->sctx; c68cfb718c8f97 Srinivas Kandagatla 2019-02-08 369 struct fastrpc_map *map = NULL; d259063578ed76 Ling Xu 2025-08-06 370 struct dma_buf *buf; 9446fa1683a7e3 Abel Vesa 2022-11-24 371 int ret = -ENOENT; c68cfb718c8f97 Srinivas Kandagatla 2019-02-08 372 d259063578ed76 Ling Xu 2025-08-06 373 buf = dma_buf_get(fd); d259063578ed76 Ling Xu 2025-08-06 374 if (IS_ERR(buf)) d259063578ed76 Ling Xu 2025-08-06 375 return PTR_ERR(buf); d259063578ed76 Ling Xu 2025-08-06 376 9446fa1683a7e3 Abel Vesa 2022-11-24 377 spin_lock(&fl->lock); c68cfb718c8f97 Srinivas Kandagatla 2019-02-08 378 list_for_each_entry(map, &fl->maps, node) { d259063578ed76 Ling Xu 2025-08-06 379 if (map->fd != fd || map->buf != buf) 9446fa1683a7e3 Abel Vesa 2022-11-24 380 continue; 9446fa1683a7e3 Abel Vesa 2022-11-24 381 9446fa1683a7e3 Abel Vesa 2022-11-24 382 *ppmap = map; 9446fa1683a7e3 Abel Vesa 2022-11-24 383 ret = 0; 9446fa1683a7e3 Abel Vesa 2022-11-24 384 break; c68cfb718c8f97 Srinivas Kandagatla 2019-02-08 385 } 9446fa1683a7e3 Abel Vesa 2022-11-24 386 spin_unlock(&fl->lock); 8f6c1d8c4f0cc3 Vamsi Krishna Gattupalli 2022-02-14 387 8f6c1d8c4f0cc3 Vamsi Krishna Gattupalli 2022-02-14 388 return ret; 8f6c1d8c4f0cc3 Vamsi Krishna Gattupalli 2022-02-14 389 } 8f6c1d8c4f0cc3 Vamsi Krishna Gattupalli 2022-02-14 390