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Message-ID: <202512131329.SjvhP0i3-lkp@intel.com>
Date: Sat, 13 Dec 2025 13:25:32 +0800
From: kernel test robot <lkp@...el.com>
To: Arnd Bergmann <arnd@...db.de>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
linux-kernel@...r.kernel.org,
Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: drivers/gpu/drm/omapdrm/dss/dispc.c:527:32: warning: stack frame
size (2688) exceeds limit (2048) in 'dispc_restore_context'
Hi Arnd,
FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 187d0801404f415f22c0b31531982c7ea97fa341
commit: 660942f2441df622d527f216009f332151843ce8 drm: omapdrm: reduce clang stack usage
date: 6 months ago
config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20251213/202512131329.SjvhP0i3-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251213/202512131329.SjvhP0i3-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512131329.SjvhP0i3-lkp@intel.com/
All warnings (new ones prefixed by >>):
drivers/gpu/drm/omapdrm/dss/dispc.c:4720:27: warning: stack frame size (2672) exceeds limit (2048) in 'dispc_runtime_suspend' [-Wframe-larger-than]
4720 | static __maybe_unused int dispc_runtime_suspend(struct device *dev)
| ^
>> drivers/gpu/drm/omapdrm/dss/dispc.c:527:32: warning: stack frame size (2688) exceeds limit (2048) in 'dispc_restore_context' [-Wframe-larger-than]
527 | static noinline_for_stack void dispc_restore_context(struct dispc_device *dispc)
| ^
2 warnings generated.
vim +/dispc_restore_context +527 drivers/gpu/drm/omapdrm/dss/dispc.c
526
> 527 static noinline_for_stack void dispc_restore_context(struct dispc_device *dispc)
528 {
529 int i, j;
530
531 DSSDBG("dispc_restore_context\n");
532
533 if (!dispc->ctx_valid)
534 return;
535
536 /*RR(dispc, IRQENABLE);*/
537 /*RR(dispc, CONTROL);*/
538 RR(dispc, CONFIG);
539 RR(dispc, LINE_NUMBER);
540 if (dispc_has_feature(dispc, FEAT_ALPHA_FIXED_ZORDER) ||
541 dispc_has_feature(dispc, FEAT_ALPHA_FREE_ZORDER))
542 RR(dispc, GLOBAL_ALPHA);
543 if (dispc_has_feature(dispc, FEAT_MGR_LCD2))
544 RR(dispc, CONFIG2);
545 if (dispc_has_feature(dispc, FEAT_MGR_LCD3))
546 RR(dispc, CONFIG3);
547
548 for (i = 0; i < dispc_get_num_mgrs(dispc); i++) {
549 RR(dispc, DEFAULT_COLOR(i));
550 RR(dispc, TRANS_COLOR(i));
551 RR(dispc, SIZE_MGR(i));
552 if (i == OMAP_DSS_CHANNEL_DIGIT)
553 continue;
554 RR(dispc, TIMING_H(i));
555 RR(dispc, TIMING_V(i));
556 RR(dispc, POL_FREQ(i));
557 RR(dispc, DIVISORo(i));
558
559 RR(dispc, DATA_CYCLE1(i));
560 RR(dispc, DATA_CYCLE2(i));
561 RR(dispc, DATA_CYCLE3(i));
562
563 if (dispc_has_feature(dispc, FEAT_CPR)) {
564 RR(dispc, CPR_COEF_R(i));
565 RR(dispc, CPR_COEF_G(i));
566 RR(dispc, CPR_COEF_B(i));
567 }
568 }
569
570 for (i = 0; i < dispc_get_num_ovls(dispc); i++) {
571 RR(dispc, OVL_BA0(i));
572 RR(dispc, OVL_BA1(i));
573 RR(dispc, OVL_POSITION(i));
574 RR(dispc, OVL_SIZE(i));
575 RR(dispc, OVL_ATTRIBUTES(i));
576 RR(dispc, OVL_FIFO_THRESHOLD(i));
577 RR(dispc, OVL_ROW_INC(i));
578 RR(dispc, OVL_PIXEL_INC(i));
579 if (dispc_has_feature(dispc, FEAT_PRELOAD))
580 RR(dispc, OVL_PRELOAD(i));
581 if (i == OMAP_DSS_GFX) {
582 RR(dispc, OVL_WINDOW_SKIP(i));
583 RR(dispc, OVL_TABLE_BA(i));
584 continue;
585 }
586 RR(dispc, OVL_FIR(i));
587 RR(dispc, OVL_PICTURE_SIZE(i));
588 RR(dispc, OVL_ACCU0(i));
589 RR(dispc, OVL_ACCU1(i));
590
591 for (j = 0; j < 8; j++)
592 RR(dispc, OVL_FIR_COEF_H(i, j));
593
594 for (j = 0; j < 8; j++)
595 RR(dispc, OVL_FIR_COEF_HV(i, j));
596
597 for (j = 0; j < 5; j++)
598 RR(dispc, OVL_CONV_COEF(i, j));
599
600 if (dispc_has_feature(dispc, FEAT_FIR_COEF_V)) {
601 for (j = 0; j < 8; j++)
602 RR(dispc, OVL_FIR_COEF_V(i, j));
603 }
604
605 if (dispc_has_feature(dispc, FEAT_HANDLE_UV_SEPARATE)) {
606 RR(dispc, OVL_BA0_UV(i));
607 RR(dispc, OVL_BA1_UV(i));
608 RR(dispc, OVL_FIR2(i));
609 RR(dispc, OVL_ACCU2_0(i));
610 RR(dispc, OVL_ACCU2_1(i));
611
612 for (j = 0; j < 8; j++)
613 RR(dispc, OVL_FIR_COEF_H2(i, j));
614
615 for (j = 0; j < 8; j++)
616 RR(dispc, OVL_FIR_COEF_HV2(i, j));
617
618 for (j = 0; j < 8; j++)
619 RR(dispc, OVL_FIR_COEF_V2(i, j));
620 }
621 if (dispc_has_feature(dispc, FEAT_ATTR2))
622 RR(dispc, OVL_ATTRIBUTES2(i));
623 }
624
625 if (dispc_has_feature(dispc, FEAT_CORE_CLK_DIV))
626 RR(dispc, DIVISOR);
627
628 /* enable last, because LCD & DIGIT enable are here */
629 RR(dispc, CONTROL);
630 if (dispc_has_feature(dispc, FEAT_MGR_LCD2))
631 RR(dispc, CONTROL2);
632 if (dispc_has_feature(dispc, FEAT_MGR_LCD3))
633 RR(dispc, CONTROL3);
634 /* clear spurious SYNC_LOST_DIGIT interrupts */
635 dispc_clear_irqstatus(dispc, DISPC_IRQ_SYNC_LOST_DIGIT);
636
637 /*
638 * enable last so IRQs won't trigger before
639 * the context is fully restored
640 */
641 RR(dispc, IRQENABLE);
642
643 DSSDBG("context restored\n");
644 }
645
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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