tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git pending-fixes head: c9b6935dc4f4d4ea5d48b6ea96220632c1a5eadf commit: bac63f1239aceb092e94fee3ef112dbaea79b372 [81/200] media: vb2: set cache sync hints when init buffers config: mips-randconfig-r026-20201209 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 1968804ac726e7674d5de22bc2204b45857da344) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=bac63f1239aceb092e94fee3ef112dbaea79b372 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next pending-fixes git checkout bac63f1239aceb092e94fee3ef112dbaea79b372 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/media/common/videobuf2/videobuf2-core.c:391:12: warning: stack frame size of 1040 bytes in function '__vb2_queue_alloc' static int __vb2_queue_alloc(struct vb2_queue enum vb2_memory memory, ^ fatal error: error in backend: Nested variants found in inline asm string: ' .set push .set mips64r2 .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/atomic.h", .line = 154, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif 1: ll $0, $1 # atomic_sub subu $0, $2 sc $0, $1 beqz $0, 1b .set pop ' clang-12: error: clang frontend command failed with exit code 70 (use -v to see invocation) clang version 12.0.0 (git://gitmirror/llvm_project 1968804ac726e7674d5de22bc2204b45857da344) Target: mipsel-unknown-linux-gnu Thread model: posix InstalledDir: /opt/cross/clang-1968804ac7/bin clang-12: note: diagnostic msg: Makefile arch drivers include kernel net scripts source usr vim +/__vb2_queue_alloc +391 drivers/media/common/videobuf2/videobuf2-core.c e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 383 2a87af6ba1b9df drivers/media/v4l2-core/videobuf2-core.c Mauro Carvalho Chehab 2017-11-27 384 /* e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 385 * __vb2_queue_alloc() - allocate videobuf buffer structures and (for MMAP type) e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 386 * video buffer memory for all buffers/planes on the queue and initializes the e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 387 * queue e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 388 * e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 389 * Returns the number of buffers successfully allocated. e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 390 */ bed04f93424737 drivers/media/v4l2-core/videobuf2-core.c Junghak Sung 2015-10-06 @391 static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory, 58e1ba3ce6b2c8 drivers/media/v4l2-core/videobuf2-core.c Hans Verkuil 2015-11-20 392 unsigned int num_buffers, unsigned int num_planes, 58e1ba3ce6b2c8 drivers/media/v4l2-core/videobuf2-core.c Hans Verkuil 2015-11-20 393 const unsigned plane_sizes[VB2_MAX_PLANES]) e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 394 { 489648afcd309b drivers/media/v4l2-core/videobuf2-core.c Hans Verkuil 2015-11-20 395 unsigned int buffer, plane; e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 396 struct vb2_buffer *vb; e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 397 int ret; e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 398 df93dc61b0d8b1 drivers/media/common/videobuf/videobuf2-core.c Mauro Carvalho Chehab 2017-12-28 399 /* Ensure that q->num_buffers+num_buffers is below VB2_MAX_FRAME */ df93dc61b0d8b1 drivers/media/common/videobuf/videobuf2-core.c Mauro Carvalho Chehab 2017-12-28 400 num_buffers = min_t(unsigned int, num_buffers, df93dc61b0d8b1 drivers/media/common/videobuf/videobuf2-core.c Mauro Carvalho Chehab 2017-12-28 401 VB2_MAX_FRAME - q->num_buffers); df93dc61b0d8b1 drivers/media/common/videobuf/videobuf2-core.c Mauro Carvalho Chehab 2017-12-28 402 e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 403 for (buffer = 0; buffer < num_buffers; ++buffer) { e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 404 /* Allocate videobuf buffer structures */ e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 405 vb = kzalloc(q->buf_struct_size, GFP_KERNEL); e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 406 if (!vb) { b820935b35479e drivers/media/common/videobuf2/videobuf2-core.c Laurent Pinchart 2020-06-21 407 dprintk(q, 1, "memory alloc for buffer struct failed\n"); e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 408 break; e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 409 } e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 410 e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 411 vb->state = VB2_BUF_STATE_DEQUEUED; e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 412 vb->vb2_queue = q; e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 413 vb->num_planes = num_planes; 2d7007153f0c9b drivers/media/v4l2-core/videobuf2-core.c Junghak Sung 2015-09-22 414 vb->index = q->num_buffers + buffer; 2d7007153f0c9b drivers/media/v4l2-core/videobuf2-core.c Junghak Sung 2015-09-22 415 vb->type = q->type; 2d7007153f0c9b drivers/media/v4l2-core/videobuf2-core.c Junghak Sung 2015-09-22 416 vb->memory = memory; bac63f1239aceb drivers/media/common/videobuf2/videobuf2-core.c Sergey Senozhatsky 2020-11-30 417 /* bac63f1239aceb drivers/media/common/videobuf2/videobuf2-core.c Sergey Senozhatsky 2020-11-30 418 * We need to set these flags here so that the videobuf2 core bac63f1239aceb drivers/media/common/videobuf2/videobuf2-core.c Sergey Senozhatsky 2020-11-30 419 * will call ->prepare()/->finish() cache sync/flush on vb2 bac63f1239aceb drivers/media/common/videobuf2/videobuf2-core.c Sergey Senozhatsky 2020-11-30 420 * buffers when appropriate. However, we can avoid explicit bac63f1239aceb drivers/media/common/videobuf2/videobuf2-core.c Sergey Senozhatsky 2020-11-30 421 * ->prepare() and ->finish() cache sync for DMABUF buffers, bac63f1239aceb drivers/media/common/videobuf2/videobuf2-core.c Sergey Senozhatsky 2020-11-30 422 * because DMA exporter takes care of it. bac63f1239aceb drivers/media/common/videobuf2/videobuf2-core.c Sergey Senozhatsky 2020-11-30 423 */ bac63f1239aceb drivers/media/common/videobuf2/videobuf2-core.c Sergey Senozhatsky 2020-11-30 424 if (q->memory != VB2_MEMORY_DMABUF) { bac63f1239aceb drivers/media/common/videobuf2/videobuf2-core.c Sergey Senozhatsky 2020-11-30 425 vb->need_cache_sync_on_prepare = 1; bac63f1239aceb drivers/media/common/videobuf2/videobuf2-core.c Sergey Senozhatsky 2020-11-30 426 vb->need_cache_sync_on_finish = 1; bac63f1239aceb drivers/media/common/videobuf2/videobuf2-core.c Sergey Senozhatsky 2020-11-30 427 } 58e1ba3ce6b2c8 drivers/media/v4l2-core/videobuf2-core.c Hans Verkuil 2015-11-20 428 for (plane = 0; plane < num_planes; ++plane) { 58e1ba3ce6b2c8 drivers/media/v4l2-core/videobuf2-core.c Hans Verkuil 2015-11-20 429 vb->planes[plane].length = plane_sizes[plane]; 58e1ba3ce6b2c8 drivers/media/v4l2-core/videobuf2-core.c Hans Verkuil 2015-11-20 430 vb->planes[plane].min_length = plane_sizes[plane]; 58e1ba3ce6b2c8 drivers/media/v4l2-core/videobuf2-core.c Hans Verkuil 2015-11-20 431 } 8e013700bc1280 drivers/media/common/videobuf2/videobuf2-core.c Hans Verkuil 2018-06-01 432 call_void_bufop(q, init_buffer, vb); 8e013700bc1280 drivers/media/common/videobuf2/videobuf2-core.c Hans Verkuil 2018-06-01 433 e32f856ab29e93 drivers/media/v4l2-core/videobuf2-core.c Hans Verkuil 2015-11-20 434 q->bufs[vb->index] = vb; e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 435 e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 436 /* Allocate video buffer memory for the MMAP type */ bed04f93424737 drivers/media/v4l2-core/videobuf2-core.c Junghak Sung 2015-10-06 437 if (memory == VB2_MEMORY_MMAP) { c1426bc727b788 drivers/media/video/videobuf2-core.c Marek Szyprowski 2011-08-24 438 ret = __vb2_buf_mem_alloc(vb); e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 439 if (ret) { b820935b35479e drivers/media/common/videobuf2/videobuf2-core.c Laurent Pinchart 2020-06-21 440 dprintk(q, 1, "failed allocating memory for buffer %d\n", 8720427c198b6d drivers/media/v4l2-core/videobuf2-core.c Mauro Carvalho Chehab 2016-10-18 441 buffer); e32f856ab29e93 drivers/media/v4l2-core/videobuf2-core.c Hans Verkuil 2015-11-20 442 q->bufs[vb->index] = NULL; 58e1ba3ce6b2c8 drivers/media/v4l2-core/videobuf2-core.c Hans Verkuil 2015-11-20 443 kfree(vb); e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 444 break; e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 445 } 20eedf0e169180 drivers/media/v4l2-core/videobuf2-core.c Hans Verkuil 2015-11-20 446 __setup_offsets(vb); e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 447 /* e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 448 * Call the driver-provided buffer initialization e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 449 * callback, if given. An error in initialization e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 450 * results in queue setup failure. e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 451 */ b5b4541eef8eac drivers/media/v4l2-core/videobuf2-core.c Hans Verkuil 2014-01-29 452 ret = call_vb_qop(vb, buf_init, vb); e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 453 if (ret) { b820935b35479e drivers/media/common/videobuf2/videobuf2-core.c Laurent Pinchart 2020-06-21 454 dprintk(q, 1, "buffer %d %p initialization failed\n", 8720427c198b6d drivers/media/v4l2-core/videobuf2-core.c Mauro Carvalho Chehab 2016-10-18 455 buffer, vb); e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 456 __vb2_buf_mem_free(vb); e32f856ab29e93 drivers/media/v4l2-core/videobuf2-core.c Hans Verkuil 2015-11-20 457 q->bufs[vb->index] = NULL; e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 458 kfree(vb); e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 459 break; e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 460 } e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 461 } e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 462 } e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 463 b820935b35479e drivers/media/common/videobuf2/videobuf2-core.c Laurent Pinchart 2020-06-21 464 dprintk(q, 3, "allocated %d buffers, %d plane(s) each\n", 2d86401c2cbfce drivers/media/video/videobuf2-core.c Guennadi Liakhovetski 2011-09-28 465 buffer, num_planes); e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 466 e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 467 return buffer; e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 468 } e23ccc0ad92586 drivers/media/video/videobuf2-core.c Pawel Osciak 2010-10-11 469 :::::: The code at line 391 was first introduced by commit :::::: bed04f9342473743fc96b71c3130f645c718bd47 [media] media: videobuf2: Replace v4l2-specific data with vb2 data :::::: TO: Junghak Sung <jh1009.sung@xxxxxxxxxxx> :::::: CC: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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