From: kernel test robot <lkp@intel.com>
To: oe-kbuild@lists.linux.dev
Cc: lkp@intel.com, Dan Carpenter <error27@gmail.com>
Subject: drivers/gpu/drm/panel/panel-himax-hx8279.c:807 hx8279_check_gmux_config() warn: impossible condition '(gmux->gout_r[i] > ((((0) + (((((1 << (8 * 4 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 4 - 1 - (((-1)) < 1))))) << (6) & ((((1 << (8 * 4 - 1 - (((-1)) < 1))...
Date: Mon, 23 Mar 2026 21:16:37 +0800 [thread overview]
Message-ID: <202603232130.qpAvbdVw-lkp@intel.com> (raw)
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
CC: Yury Norov <yury.norov@gmail.com>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: c369299895a591d96745d6492d4888259b004a9e
commit: 104ea1c84b91c9f452e497ba51602b903711cdd5 bits: unify the non-asm GENMASK*()
date: 8 months ago
:::::: branch date: 15 hours ago
:::::: commit date: 8 months ago
config: i386-randconfig-141-20260323 (https://download.01.org/0day-ci/archive/20260323/202603232130.qpAvbdVw-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
smatch: v0.5.0-9004-gb810ac53
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>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202603232130.qpAvbdVw-lkp@intel.com/
New smatch warnings:
drivers/gpu/drm/panel/panel-himax-hx8279.c:807 hx8279_check_gmux_config() warn: impossible condition '(gmux->gout_r[i] > ((((0) + (((((1 << (8 * 4 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 4 - 1 - (((-1)) < 1))))) << (6) & ((((1 << (8 * 4 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 4 - 1 - (((-1)) < 1))))) >> ((4 * 8) - 1 - (7))))) | (((0) + (((((1 << (8 * 4 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 4 - 1 - (((-1)) < 1))))) << (0) & ((((1 << (8 * 4 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 4 - 1 - (((-1)) < 1))))) >> ((4 * 8) - 1 - (5))))))) => (0-255 > 255)'
Old smatch warnings:
drivers/gpu/drm/panel/panel-himax-hx8279.c:801 hx8279_check_gmux_config() warn: impossible condition '(gmux->gout_l[i] > ((((0) + (((((1 << (8 * 4 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 4 - 1 - (((-1)) < 1))))) << (6) & ((((1 << (8 * 4 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 4 - 1 - (((-1)) < 1))))) >> ((4 * 8) - 1 - (7))))) | (((0) + (((((1 << (8 * 4 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 4 - 1 - (((-1)) < 1))))) << (0) & ((((1 << (8 * 4 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 4 - 1 - (((-1)) < 1))))) >> ((4 * 8) - 1 - (5))))))) => (0-255 > 255)'
vim +807 drivers/gpu/drm/panel/panel-himax-hx8279.c
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 789
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 790 static int hx8279_check_gmux_config(struct hx8279 *hx, struct device *dev)
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 791 {
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 792 const struct hx8279_panel_desc *desc = hx->desc;
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 793 const struct hx8279_goa_mux *gmux = desc->gmux;
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 794 int i;
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 795
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 796 /* No gmux defined means we simply skip the GOA mux configuration */
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 797 if (!gmux)
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 798 return 0;
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 799
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 800 for (i = 0; i < ARRAY_SIZE(gmux->gout_l); i++) {
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 801 if (gmux->gout_l[i] > (HX8279_GOUT_STB | HX8279_GOUT_SEL))
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 802 return dev_err_probe(dev, -EINVAL,
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 803 "Invalid value found in gout_l[%d]\n", i);
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 804 }
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 805
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 806 for (i = 0; i < ARRAY_SIZE(gmux->gout_r); i++) {
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 @807 if (gmux->gout_r[i] > (HX8279_GOUT_STB | HX8279_GOUT_SEL))
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 808 return dev_err_probe(dev, -EINVAL,
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 809 "Invalid value found in gout_r[%d]\n", i);
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 810 }
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 811
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 812 return 0;
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 813 }
38d42c26138998 AngeloGioacchino Del Regno 2025-04-14 814
:::::: The code at line 807 was first introduced by commit
:::::: 38d42c261389985e8dd4739dbd97e2dc855e8dd0 drm: panel: Add driver for Himax HX8279 DDIC panels
:::::: TO: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
:::::: CC: Neil Armstrong <neil.armstrong@linaro.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next reply other threads:[~2026-03-23 13:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-23 13:16 kernel test robot [this message]
-- strict thread matches above, loose matches on Subject: below --
2026-07-24 20:43 drivers/gpu/drm/panel/panel-himax-hx8279.c:807 hx8279_check_gmux_config() warn: impossible condition '(gmux->gout_r[i] > ((((0) + (((((1 << (8 * 4 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 4 - 1 - (((-1)) < 1))))) << (6) & ((((1 << (8 * 4 - 1 - (((-1)) < 1)) kernel test robot
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