From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 17C3D2DA756 for ; Sat, 6 Dec 2025 11:03:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.10 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765019037; cv=none; b=GNa5QDu7lP19qi8TW7PCbL74dsRcqykSiCfEkVCDy+eXfCKwzp+dB5ty3QEtjaRlDojdUNOXIfVvSSCQsh+CtTlhMdtjN2eaISlmCnDbt5FJaKe3XCI6vaSmiYWrPehvt8sUdrJhuy10LY9wzkrqUO5SDHgjuc6drf8rfpXGMQA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765019037; c=relaxed/simple; bh=FVxBYX059zmwCjaaWd+BJKUVV9gcvVshUbIrs0uyIi4=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=Oz6D/9HwN4zER9NQQukbI68N2nCOD2brkHooGE2IAU/HW57W1TeoqDiawIV+ZPtukFVXgPngrsqd0oDPJpcHjy80i62qR9ydgNSXHfuxaeLCwuvK21t/kKlZ0n7peqM7Jmdh3LSTdpaNNr+vf9kxnUr+EduzOA0SeBuXCHiQlmg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=C2NgFOFT; arc=none smtp.client-ip=192.198.163.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="C2NgFOFT" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1765019036; x=1796555036; h=date:from:to:cc:subject:message-id:mime-version; bh=FVxBYX059zmwCjaaWd+BJKUVV9gcvVshUbIrs0uyIi4=; b=C2NgFOFTF6LhX8JqWRniEZPZkTubQWvS5RMFVW8nBHSi0qCtjrEEPjys B2T6iJKfEcBJO01j2/C1vMZwoO23rR+Db+WVwm8VT+5/8ZlT41Os5DaWl qrjnow+8OPLM2b+guZl4K/W6dWu7hmF3waPyEkohcZ1t1ewhgsKF8/j8R fJbGa+UftZJHnUHJT06fSV0f244dmXIHIK/oMvN7IK29aTO74cmOJxGRJ lNwX9Je6wjpLBvyW8SreeeO+89Llgw/FrdKNV6XtrY6Or0tPbYDojgK51 M6woZ7B8rXxVrSclDCVaN59b3BwLRUpjoI2GpQvjFrAuROsiePk6FcXLB A==; X-CSE-ConnectionGUID: 0tULHzehQwyfhjkMADam7A== X-CSE-MsgGUID: hiYThADgShyQU/5XVVL3Nw== X-IronPort-AV: E=McAfee;i="6800,10657,11633"; a="78391423" X-IronPort-AV: E=Sophos;i="6.20,254,1758610800"; d="scan'208";a="78391423" Received: from orviesa008.jf.intel.com ([10.64.159.148]) by fmvoesa104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Dec 2025 03:03:55 -0800 X-CSE-ConnectionGUID: gkEAMfGgTL+7IUQelfAEYA== X-CSE-MsgGUID: xKlkZM0pQBuSzjrq0LyKmQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,254,1758610800"; d="scan'208";a="195582696" Received: from lkp-server01.sh.intel.com (HELO 4664bbef4914) ([10.239.97.150]) by orviesa008.jf.intel.com with ESMTP; 06 Dec 2025 03:03:53 -0800 Received: from kbuild by 4664bbef4914 with local (Exim 4.98.2) (envelope-from ) id 1vRq4s-00000000G6J-2ieD; Sat, 06 Dec 2025 11:03:50 +0000 Date: Sat, 6 Dec 2025 19:03:50 +0800 From: kernel test robot To: Claudiu Beznea Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, Bjorn Helgaas , Manivannan Sadhasivam Subject: include/linux/bitmap.h:820:13: warning: 'bitmap' is used uninitialized in this function Message-ID: <202512061812.Xbqmd2Gn-lkp@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 416f99c3b16f582a3fc6d64a1f77f39d94b76de5 commit: 7ef502fb35b283e0f85ed7b34e2d963343981a8c PCI: Add Renesas RZ/G3S host controller driver date: 11 days ago config: sparc64-randconfig-r133-20251206 (https://download.01.org/0day-ci/archive/20251206/202512061812.Xbqmd2Gn-lkp@intel.com/config) compiler: sparc64-linux-gcc (GCC) 10.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251206/202512061812.Xbqmd2Gn-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 | Closes: https://lore.kernel.org/oe-kbuild-all/202512061812.Xbqmd2Gn-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from drivers/pci/controller/pcie-rzg3s-host.c:13: drivers/pci/controller/pcie-rzg3s-host.c: In function 'rzg3s_pcie_msi_irq.part.0': >> include/linux/bitmap.h:820:13: warning: 'bitmap' is used uninitialized in this function [-Wuninitialized] 820 | map[index] &= (fit ? (~(mask << offset)) : ~BITMAP_FIRST_WORD_MASK(start)); | ^~ In file included from include/linux/kasan-checks.h:5, from include/asm-generic/rwonce.h:26, from ./arch/sparc/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:382, from include/linux/build_bug.h:5, from include/linux/bitfield.h:10, from drivers/pci/controller/pcie-rzg3s-host.c:12: drivers/pci/controller/pcie-rzg3s-host.c:482:17: note: 'bitmap' was declared here 482 | DECLARE_BITMAP(bitmap, RZG3S_PCI_MSI_INT_NR); | ^~~~~~ include/linux/types.h:11:16: note: in definition of macro 'DECLARE_BITMAP' 11 | unsigned long name[BITS_TO_LONGS(bits)] | ^~~~ vim +/bitmap +820 include/linux/bitmap.h 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 784 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 785 /** 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 786 * bitmap_write - write n-bit value within a memory region 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 787 * @map: address to the bitmap memory region 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 788 * @value: value to write, clamped to nbits 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 789 * @start: bit offset of the n-bit value 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 790 * @nbits: size of value in bits, nonzero, up to BITS_PER_LONG. 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 791 * 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 792 * bitmap_write() behaves as-if implemented as @nbits calls of __assign_bit(), 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 793 * i.e. bits beyond @nbits are ignored: 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 794 * 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 795 * for (bit = 0; bit < nbits; bit++) 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 796 * __assign_bit(start + bit, bitmap, val & BIT(bit)); 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 797 * 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 798 * For @nbits == 0 and @nbits > BITS_PER_LONG no writes are performed. 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 799 */ ed8cd2b3bd9f07 Yury Norov 2024-07-18 800 static __always_inline ed8cd2b3bd9f07 Yury Norov 2024-07-18 801 void bitmap_write(unsigned long *map, unsigned long value, 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 802 unsigned long start, unsigned long nbits) 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 803 { 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 804 size_t index; 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 805 unsigned long offset; 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 806 unsigned long space; 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 807 unsigned long mask; 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 808 bool fit; 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 809 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 810 if (unlikely(!nbits || nbits > BITS_PER_LONG)) 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 811 return; 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 812 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 813 mask = BITMAP_LAST_WORD_MASK(nbits); 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 814 value &= mask; 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 815 offset = start % BITS_PER_LONG; 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 816 space = BITS_PER_LONG - offset; 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 817 fit = space >= nbits; 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 818 index = BIT_WORD(start); 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 819 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 @820 map[index] &= (fit ? (~(mask << offset)) : ~BITMAP_FIRST_WORD_MASK(start)); 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 821 map[index] |= value << offset; 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 822 if (fit) 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 823 return; 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 824 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 825 map[index + 1] &= BITMAP_FIRST_WORD_MASK(start + nbits); 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 826 map[index + 1] |= (value >> space); 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 827 } 63c15822b8dd02 Syed Nayyar Waris 2024-03-27 828 :::::: The code at line 820 was first introduced by commit :::::: 63c15822b8dd02a2423cfd92232245ace3f7a11b lib/bitmap: add bitmap_{read,write}() :::::: TO: Syed Nayyar Waris :::::: CC: David S. Miller -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki