From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on gnuweeb.org X-Spam-Level: X-Spam-Status: No, score=-3.5 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by gnuweeb.org (Postfix) with ESMTPS id 49F008321E for ; Wed, 1 Mar 2023 06:06:10 +0000 (UTC) Authentication-Results: gnuweeb.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=McZ+x6UT; dkim-atps=neutral DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1677650770; x=1709186770; h=date:from:to:cc:subject:message-id:mime-version; bh=neGwb+rLWeG/QOeJiUYpQFXymqHHwKbB90waRfEGfoA=; b=McZ+x6UTdqudIDaqqdaiDwUFFlnxZ2mUR8edKt9D056mQ6techg//mtt PtycMBUp3+gG2Y9pUTRi+4kc9QpqdWhX4Yn5Jv1M98aLMS2Yb8lQTajKX 1QASLR1OWUN9d9bv2OLLdnVSqmF+Ukfsj9Lu+NmGMl29ZvlhpR/Cx5qus qpLu6xeQd00PLq36ABf1U9ollc2H3XLCj5L21xWqIMUBHRr+Jk6WETKyt cV/a7zvVBxJkFnoiGQUK3mVM9aiPINTVXPcPLVSZu75vKnfXqqrQtNqQl TYX3DCkb+eaAU2tXungwU63HJbO7dJpeCWd3GNwJll0w7gQDqXpVGbOXk w==; X-IronPort-AV: E=McAfee;i="6500,9779,10635"; a="420590062" X-IronPort-AV: E=Sophos;i="5.98,224,1673942400"; d="scan'208";a="420590062" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Feb 2023 22:06:08 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10635"; a="1003533405" X-IronPort-AV: E=Sophos;i="5.98,224,1673942400"; d="scan'208";a="1003533405" Received: from lkp-server01.sh.intel.com (HELO 3895f5c55ead) ([10.239.97.150]) by fmsmga005.fm.intel.com with ESMTP; 28 Feb 2023 22:06:07 -0800 Received: from kbuild by 3895f5c55ead with local (Exim 4.96) (envelope-from ) id 1pXFbK-0005wd-1y; Wed, 01 Mar 2023 06:06:06 +0000 Date: Wed, 1 Mar 2023 14:06:00 +0800 From: kernel test robot To: Thomas Gleixner Cc: oe-kbuild-all@lists.linux.dev, Ammar Faizi , GNU/Weeb Mailing List Subject: [ammarfaizi2-block:tglx/devel/rcuref 2/3] include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (e0000000 becomes 0) Message-ID: <202303011432.wytVFQ48-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline List-Id: tree: https://github.com/ammarfaizi2/linux-block tglx/devel/rcuref head: 9dcf0830de36103b3a5ed2bdd1bfa5cbcc1032d8 commit: 212b3a6f7d18535cb6b745193608bf2ffaf111b9 [2/3] atomics: Provide rcuref - scalable reference counting config: nios2-randconfig-s032-20230226 (https://download.01.org/0day-ci/archive/20230301/202303011432.wytVFQ48-lkp@intel.com/config) compiler: nios2-linux-gcc (GCC) 12.1.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-39-gce1a6720-dirty # https://github.com/ammarfaizi2/linux-block/commit/212b3a6f7d18535cb6b745193608bf2ffaf111b9 git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block tglx/devel/rcuref git checkout 212b3a6f7d18535cb6b745193608bf2ffaf111b9 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=nios2 olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=nios2 SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot | Link: https://lore.kernel.org/oe-kbuild-all/202303011432.wytVFQ48-lkp@intel.com/ sparse warnings: (new ones prefixed by >>) lib/rcuref.c: note: in included file (through include/asm-generic/cmpxchg.h, arch/nios2/include/generated/asm/cmpxchg.h, include/asm-generic/atomic.h, ...): >> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (e0000000 becomes 0) include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (e0000000 becomes 0) vim +30 include/asm-generic/cmpxchg-local.h 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 7 aa93685afbefa0 Behan Webster 2012-11-20 8 extern unsigned long wrong_size_cmpxchg(volatile void *ptr) aa93685afbefa0 Behan Webster 2012-11-20 9 __noreturn; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 10 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 11 /* 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 12 * Generic version of __cmpxchg_local (disables interrupts). Takes an unsigned 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 13 * long parameter, supporting various types of architectures. 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 14 */ 6988631bdfddce Mark Rutland 2021-05-25 15 static inline unsigned long __generic_cmpxchg_local(volatile void *ptr, 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 16 unsigned long old, unsigned long new, int size) 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 17 { 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 18 unsigned long flags, prev; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 19 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 20 /* 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 21 * Sanity checking, compile-time. 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 22 */ 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 23 if (size == 8 && sizeof(unsigned long) != 8) 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 24 wrong_size_cmpxchg(ptr); 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 25 5042afe7fe3239 Ingo Molnar 2009-07-03 26 raw_local_irq_save(flags); 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 27 switch (size) { 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 28 case 1: prev = *(u8 *)ptr; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 29 if (prev == old) 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 @30 *(u8 *)ptr = (u8)new; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 31 break; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 32 case 2: prev = *(u16 *)ptr; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 33 if (prev == old) 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 34 *(u16 *)ptr = (u16)new; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 35 break; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 36 case 4: prev = *(u32 *)ptr; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 37 if (prev == old) 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 38 *(u32 *)ptr = (u32)new; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 39 break; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 40 case 8: prev = *(u64 *)ptr; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 41 if (prev == old) 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 42 *(u64 *)ptr = (u64)new; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 43 break; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 44 default: 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 45 wrong_size_cmpxchg(ptr); 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 46 } 5042afe7fe3239 Ingo Molnar 2009-07-03 47 raw_local_irq_restore(flags); 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 48 return prev; 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 49 } 068fbad288a2c1 Mathieu Desnoyers 2008-02-07 50 :::::: The code at line 30 was first introduced by commit :::::: 068fbad288a2c18b75b0425fb56d241f018a1cb5 Add cmpxchg_local to asm-generic for per cpu atomic operations :::::: TO: Mathieu Desnoyers :::::: CC: Linus Torvalds -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests