Hi Paritcher, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on tip/auto-latest] [also build test WARNING on platform-drivers-x86/for-next linus/master linux/master v5.7 next-20200605] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Y-Paritcher/platform-x86-dell-wm... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 22a1c800c96c83b7f4e3e02fad767502b70124fa config: i386-randconfig-s002-20200608 (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.1-247-gcadbd124-dirty # save the attached .config to linux build tree make W=1 C=1 ARCH=i386 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): drivers/platform/x86/dell-wmi.c: In function 'handle_dmi_entry': 506 | u16 keycode = (bios_entry->keycode < | ^ vim +506 drivers/platform/x86/dell-wmi.c a464afb9581f6a Andy Lutomirski 2016-02-15 464 bff589be59c509 Andy Lutomirski 2015-11-25 465 static void handle_dmi_entry(const struct dmi_header *dm, void *opaque) 5ea2559726b786 Rezwanul Kabir 2009-11-02 466 { 18b6f80f509503 Andy Lutomirski 2016-02-15 467 struct dell_dmi_results *results = opaque; 18b6f80f509503 Andy Lutomirski 2016-02-15 468 struct dell_bios_hotkey_table *table; a464afb9581f6a Andy Lutomirski 2016-02-15 469 int hotkey_num, i, pos = 0; 890a7c8e8dc2d0 Dmitry Torokhov 2010-08-04 470 struct key_entry *keymap; 18b6f80f509503 Andy Lutomirski 2016-02-15 471 18b6f80f509503 Andy Lutomirski 2016-02-15 472 if (results->err || results->keymap) 18b6f80f509503 Andy Lutomirski 2016-02-15 473 return; /* We already found the hotkey table. */ 18b6f80f509503 Andy Lutomirski 2016-02-15 474 074df51ca84d32 Andy Lutomirski 2016-02-17 475 /* The Dell hotkey table is type 0xB2. Scan until we find it. */ b13de7019c1b67 Andy Lutomirski 2016-02-15 476 if (dm->type != 0xb2) 18b6f80f509503 Andy Lutomirski 2016-02-15 477 return; 18b6f80f509503 Andy Lutomirski 2016-02-15 478 18b6f80f509503 Andy Lutomirski 2016-02-15 479 table = container_of(dm, struct dell_bios_hotkey_table, header); 18b6f80f509503 Andy Lutomirski 2016-02-15 480 b13de7019c1b67 Andy Lutomirski 2016-02-15 481 hotkey_num = (table->header.length - b13de7019c1b67 Andy Lutomirski 2016-02-15 482 sizeof(struct dell_bios_hotkey_table)) / 18b6f80f509503 Andy Lutomirski 2016-02-15 483 sizeof(struct dell_bios_keymap_entry); b13de7019c1b67 Andy Lutomirski 2016-02-15 484 if (hotkey_num < 1) { b13de7019c1b67 Andy Lutomirski 2016-02-15 485 /* b13de7019c1b67 Andy Lutomirski 2016-02-15 486 * Historically, dell-wmi would ignore a DMI entry of b13de7019c1b67 Andy Lutomirski 2016-02-15 487 * fewer than 7 bytes. Sizes between 4 and 8 bytes are b13de7019c1b67 Andy Lutomirski 2016-02-15 488 * nonsensical (both the header and all entries are 4 b13de7019c1b67 Andy Lutomirski 2016-02-15 489 * bytes), so we approximate the old behavior by b13de7019c1b67 Andy Lutomirski 2016-02-15 490 * ignoring tables with fewer than one entry. b13de7019c1b67 Andy Lutomirski 2016-02-15 491 */ b13de7019c1b67 Andy Lutomirski 2016-02-15 492 return; b13de7019c1b67 Andy Lutomirski 2016-02-15 493 } 5ea2559726b786 Rezwanul Kabir 2009-11-02 494 e075b3c898e405 Pali Rohár 2016-06-15 495 keymap = kcalloc(hotkey_num, sizeof(struct key_entry), GFP_KERNEL); 18b6f80f509503 Andy Lutomirski 2016-02-15 496 if (!keymap) { 18b6f80f509503 Andy Lutomirski 2016-02-15 497 results->err = -ENOMEM; 18b6f80f509503 Andy Lutomirski 2016-02-15 498 return; 18b6f80f509503 Andy Lutomirski 2016-02-15 499 } 5ea2559726b786 Rezwanul Kabir 2009-11-02 500 5ea2559726b786 Rezwanul Kabir 2009-11-02 501 for (i = 0; i < hotkey_num; i++) { 890a7c8e8dc2d0 Dmitry Torokhov 2010-08-04 502 const struct dell_bios_keymap_entry *bios_entry = 18b6f80f509503 Andy Lutomirski 2016-02-15 503 &table->keymap[i]; cbc61f114af5fb Andy Lutomirski 2015-11-30 504 cbc61f114af5fb Andy Lutomirski 2015-11-30 505 /* Uninitialized entries are 0 aka KEY_RESERVED. */ cbc61f114af5fb Andy Lutomirski 2015-11-30 @506 u16 keycode = (bios_entry->keycode < cbc61f114af5fb Andy Lutomirski 2015-11-30 507 ARRAY_SIZE(bios_to_linux_keycode)) ? 890a7c8e8dc2d0 Dmitry Torokhov 2010-08-04 508 bios_to_linux_keycode[bios_entry->keycode] : 890a7c8e8dc2d0 Dmitry Torokhov 2010-08-04 509 KEY_RESERVED; 8cb8e63b569895 Gabriele Mazzotta 2014-12-04 510 cbc61f114af5fb Andy Lutomirski 2015-11-30 511 /* cbc61f114af5fb Andy Lutomirski 2015-11-30 512 * Log if we find an entry in the DMI table that we don't cbc61f114af5fb Andy Lutomirski 2015-11-30 513 * understand. If this happens, we should figure out what cbc61f114af5fb Andy Lutomirski 2015-11-30 514 * the entry means and add it to bios_to_linux_keycode. cbc61f114af5fb Andy Lutomirski 2015-11-30 515 */ cbc61f114af5fb Andy Lutomirski 2015-11-30 516 if (keycode == KEY_RESERVED) { cbc61f114af5fb Andy Lutomirski 2015-11-30 517 pr_info("firmware scancode 0x%x maps to unrecognized keycode 0x%x\n", cbc61f114af5fb Andy Lutomirski 2015-11-30 518 bios_entry->scancode, bios_entry->keycode); cbc61f114af5fb Andy Lutomirski 2015-11-30 519 continue; cbc61f114af5fb Andy Lutomirski 2015-11-30 520 } cbc61f114af5fb Andy Lutomirski 2015-11-30 521 8cb8e63b569895 Gabriele Mazzotta 2014-12-04 522 if (keycode == KEY_KBDILLUMTOGGLE) a464afb9581f6a Andy Lutomirski 2016-02-15 523 keymap[pos].type = KE_IGNORE; 8cb8e63b569895 Gabriele Mazzotta 2014-12-04 524 else a464afb9581f6a Andy Lutomirski 2016-02-15 525 keymap[pos].type = KE_KEY; a464afb9581f6a Andy Lutomirski 2016-02-15 526 keymap[pos].code = bios_entry->scancode; a464afb9581f6a Andy Lutomirski 2016-02-15 527 keymap[pos].keycode = keycode; a464afb9581f6a Andy Lutomirski 2016-02-15 528 a464afb9581f6a Andy Lutomirski 2016-02-15 529 pos++; a464afb9581f6a Andy Lutomirski 2016-02-15 530 } a464afb9581f6a Andy Lutomirski 2016-02-15 531 18b6f80f509503 Andy Lutomirski 2016-02-15 532 results->keymap = keymap; e075b3c898e405 Pali Rohár 2016-06-15 533 results->keymap_size = pos; 5ea2559726b786 Rezwanul Kabir 2009-11-02 534 } 5ea2559726b786 Rezwanul Kabir 2009-11-02 535 :::::: The code at line 506 was first introduced by commit :::::: cbc61f114af5fb078d84dc8864152f4db1712bc5 dell-wmi: Improve unknown hotkey handling :::::: TO: Andy Lutomirski <luto(a)kernel.org&gt; :::::: CC: Darren Hart <dvhart(a)linux.intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org