From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.15]) (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 2EF332FD1DB for ; Sat, 6 Dec 2025 18:43:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.15 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765046640; cv=none; b=KTUI9ekSc2hLvQO5VV9GmGhHTmyOH9HJ5iV8FJeZxw47aMYvtRLj8GCEwL6bO9MBkqNsM6xV4j05/OKsZW4BRjqjK78HUYJ8WnceYheryUpfDcfT9GOYQYyHndHVroKnKePYlEMENPkhWEDLzMCSL9ED6GzphRRLFbsFdFJ1v+s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765046640; c=relaxed/simple; bh=+j4GMEQKW7lkjZQLS9ZgugF1pwrQahe9ACh4IXRpICU=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=sfO0GG+vue1+U9RGFEQ4O72tue06NNT9FyPokfQSgKrgK+09glMAVXKJlLFYerzJMb5aM5lEsRLnc29xT0KKRVycI8RORXt2A3kKVEjCBC7Ms+I7XFBkRXi3wXNIc/AFt7MD+ijAtkWxNyPDOLcToqacm+ma1DXDXgeaBwQQDFo= 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=KWMuj2sI; arc=none smtp.client-ip=192.198.163.15 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="KWMuj2sI" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1765046638; x=1796582638; h=date:from:to:cc:subject:message-id:mime-version; bh=+j4GMEQKW7lkjZQLS9ZgugF1pwrQahe9ACh4IXRpICU=; b=KWMuj2sIj1GQ8N2pWZtu5NDiGxgRYoCLh69guoEvlhBOwBi9AIiP4yuU LC1lJWzfHLDS8Cq8VFVfVjNKNUHOknADKVDyw8r1t8adCEkwWLbuxz1Hw 7ffukSsnRsElB0Myrb2hO252v+icYXYlNUn2SfncqR56EcovYzlMt2HR0 3hM4Y062pQnDCC6QyY0Il2mreFYqzVHrnGQwt7PU+eGALBybvK9QfidVk K45fqAdcMnjaMN6Jdmg4fas08FEK2aVVMHkLvuapYB+FoRc3x6fOYlWOy ys1006MQ39n2XZtqtXH+8i5okMk2m3kqXLccncWHXmFO1kh/IyHFknQL2 g==; X-CSE-ConnectionGUID: LF+j94dpTBqyM7mu/8ICoA== X-CSE-MsgGUID: 9Jtygg43RjWwg0q9Jfoorg== X-IronPort-AV: E=McAfee;i="6800,10657,11634"; a="67129401" X-IronPort-AV: E=Sophos;i="6.20,255,1758610800"; d="scan'208";a="67129401" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Dec 2025 10:43:57 -0800 X-CSE-ConnectionGUID: DojonefgTQy8mq5YjTKqsw== X-CSE-MsgGUID: ZCuOnrNiTi+2kb5eq5Xe3Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,255,1758610800"; d="scan'208";a="195202426" Received: from lkp-server01.sh.intel.com (HELO 4664bbef4914) ([10.239.97.150]) by fmviesa007.fm.intel.com with ESMTP; 06 Dec 2025 10:43:56 -0800 Received: from kbuild by 4664bbef4914 with local (Exim 4.98.2) (envelope-from ) id 1vRxG5-00000000IgD-3744; Sat, 06 Dec 2025 18:43:53 +0000 Date: Sun, 7 Dec 2025 02:43:26 +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:820:20: warning: 'bitmap[0]' is used uninitialized Message-ID: <202512070218.XVMUQCl7-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: f468cf53c5240bf5063d0c6fe620b5ae2de37801 commit: 7ef502fb35b283e0f85ed7b34e2d963343981a8c PCI: Add Renesas RZ/G3S host controller driver date: 11 days ago config: riscv-randconfig-001-20251207 (https://download.01.org/0day-ci/archive/20251207/202512070218.XVMUQCl7-lkp@intel.com/config) compiler: riscv64-linux-gcc (GCC) 13.4.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251207/202512070218.XVMUQCl7-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/202512070218.XVMUQCl7-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from drivers/pci/controller/pcie-rzg3s-host.c:13: In function 'bitmap_write', inlined from 'rzg3s_pcie_msi_irq.part.0' at drivers/pci/controller/pcie-rzg3s-host.c:501:3: >> include/linux/bitmap.h:820:20: warning: 'bitmap[0]' is used uninitialized [-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/riscv/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: In function 'rzg3s_pcie_msi_irq.part.0': drivers/pci/controller/pcie-rzg3s-host.c:482:24: note: 'bitmap[0]' was declared here 482 | DECLARE_BITMAP(bitmap, RZG3S_PCI_MSI_INT_NR); | ^~~~~~ include/linux/types.h:11:23: note: in definition of macro 'DECLARE_BITMAP' 11 | unsigned long name[BITS_TO_LONGS(bits)] | ^~~~ Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for ARCH_HAS_ELF_CORE_EFLAGS Depends on [n]: BINFMT_ELF [=y] && ELF_CORE [=n] Selected by [y]: - RISCV [=y] vim +820 include/linux/bitmap.h 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 784 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 785 /** 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 786 * bitmap_write - write n-bit value within a memory region 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 787 * @map: address to the bitmap memory region 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 788 * @value: value to write, clamped to nbits 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 789 * @start: bit offset of the n-bit value 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 790 * @nbits: size of value in bits, nonzero, up to BITS_PER_LONG. 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 791 * 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 792 * bitmap_write() behaves as-if implemented as @nbits calls of __assign_bit(), 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 793 * i.e. bits beyond @nbits are ignored: 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 794 * 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 795 * for (bit = 0; bit < nbits; bit++) 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 796 * __assign_bit(start + bit, bitmap, val & BIT(bit)); 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 797 * 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 798 * For @nbits == 0 and @nbits > BITS_PER_LONG no writes are performed. 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 799 */ ed8cd2b3bd9f070 Yury Norov 2024-07-18 800 static __always_inline ed8cd2b3bd9f070 Yury Norov 2024-07-18 801 void bitmap_write(unsigned long *map, unsigned long value, 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 802 unsigned long start, unsigned long nbits) 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 803 { 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 804 size_t index; 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 805 unsigned long offset; 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 806 unsigned long space; 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 807 unsigned long mask; 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 808 bool fit; 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 809 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 810 if (unlikely(!nbits || nbits > BITS_PER_LONG)) 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 811 return; 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 812 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 813 mask = BITMAP_LAST_WORD_MASK(nbits); 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 814 value &= mask; 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 815 offset = start % BITS_PER_LONG; 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 816 space = BITS_PER_LONG - offset; 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 817 fit = space >= nbits; 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 818 index = BIT_WORD(start); 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 819 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 @820 map[index] &= (fit ? (~(mask << offset)) : ~BITMAP_FIRST_WORD_MASK(start)); 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 821 map[index] |= value << offset; 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 822 if (fit) 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 823 return; 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 824 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 825 map[index + 1] &= BITMAP_FIRST_WORD_MASK(start + nbits); 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 826 map[index + 1] |= (value >> space); 63c15822b8dd02a Syed Nayyar Waris 2024-03-27 827 } 63c15822b8dd02a 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