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Date: Tue, 6 Dec 2022 15:10:40 +0800
From: kernel test robot <lkp@...el.com>
To: Gao Xiang <hsiangkao@...ux.alibaba.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
Yue Hu <huyue2@...lpad.com>, Chao Yu <yuchao0@...wei.com>,
Chao Yu <chao@...nel.org>
Subject: include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast
truncates bits from constant value (e0f510cc becomes cc)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: bce9332220bd677d83b19d21502776ad555a0e73
commit: 2f44013e39984c127c6efedf70e6b5f4e9dcf315 erofs: fix pcluster use-after-free on UP platforms
date: 3 months ago
config: nios2-randconfig-s053-20221205
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2f44013e39984c127c6efedf70e6b5f4e9dcf315
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 2f44013e39984c127c6efedf70e6b5f4e9dcf315
# 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 SHELL=/bin/bash fs/erofs/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
sparse warnings: (new ones prefixed by >>)
fs/erofs/utils.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 (e0f510cc becomes cc)
>> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (e0f510cc becomes 10cc)
--
fs/erofs/zdata.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 (e0f510cc becomes cc)
>> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (e0f510cc becomes 10cc)
include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (5f0edead becomes ad)
include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (5f0edead becomes dead)
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 <mathieu.desnoyers@...ymtl.ca>
:::::: CC: Linus Torvalds <torvalds@...dy.linux-foundation.org>
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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