include/linux/atomic/atomic-instrumented.h:476:16: sparse: sparse: cast truncates bits from constant value (ffffffffaaa31337 becomes 37)

From: kernel test robot
Date: Sun Jul 24 2022 - 23:06:41 EST

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: e0dccc3b76fb35bb257b4118367a883073d7390e
commit: e3d18cee258b898017b298b5b93f8134dd62aee3 locking/atomic: centralize generated headers
date: 1 year ago
config: ia64-randconfig-s041-20220724 (https://download.01.org/0day-ci/archive/20220725/202207251016.hBpHMxZd-lkp@xxxxxxxxx/config)
compiler: ia64-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=e3d18cee258b898017b298b5b93f8134dd62aee3
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout e3d18cee258b898017b298b5b93f8134dd62aee3
# 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=ia64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

sparse warnings: (new ones prefixed by >>)
lib/atomic64_test.c: note: in included file (through include/linux/atomic.h):
>> include/linux/atomic/atomic-instrumented.h:476:16: sparse: sparse: cast truncates bits from constant value (ffffffffaaa31337 becomes 37)
include/linux/atomic/atomic-instrumented.h:476:16: sparse: sparse: cast truncates bits from constant value (ffffffffaaa31337 becomes 1337)
include/linux/atomic/atomic-instrumented.h:483:16: sparse: sparse: cast truncates bits from constant value (ffffffffaaa31337 becomes 37)
include/linux/atomic/atomic-instrumented.h:483:16: sparse: sparse: cast truncates bits from constant value (ffffffffaaa31337 becomes 1337)
include/linux/atomic/atomic-instrumented.h:490:16: sparse: sparse: cast truncates bits from constant value (ffffffffaaa31337 becomes 37)
include/linux/atomic/atomic-instrumented.h:490:16: sparse: sparse: cast truncates bits from constant value (ffffffffaaa31337 becomes 1337)
include/linux/atomic/atomic-instrumented.h:497:16: sparse: sparse: cast truncates bits from constant value (ffffffffaaa31337 becomes 37)
include/linux/atomic/atomic-instrumented.h:497:16: sparse: sparse: cast truncates bits from constant value (ffffffffaaa31337 becomes 1337)
>> include/linux/atomic/atomic-instrumented.h:476:16: sparse: sparse: cast truncates bits from constant value (11112222 becomes 22)
include/linux/atomic/atomic-instrumented.h:476:16: sparse: sparse: cast truncates bits from constant value (11112222 becomes 2222)
include/linux/atomic/atomic-instrumented.h:483:16: sparse: sparse: cast truncates bits from constant value (11112222 becomes 22)
include/linux/atomic/atomic-instrumented.h:483:16: sparse: sparse: cast truncates bits from constant value (11112222 becomes 2222)
include/linux/atomic/atomic-instrumented.h:490:16: sparse: sparse: cast truncates bits from constant value (11112222 becomes 22)
include/linux/atomic/atomic-instrumented.h:490:16: sparse: sparse: cast truncates bits from constant value (11112222 becomes 2222)
include/linux/atomic/atomic-instrumented.h:497:16: sparse: sparse: cast truncates bits from constant value (11112222 becomes 22)
include/linux/atomic/atomic-instrumented.h:497:16: sparse: sparse: cast truncates bits from constant value (11112222 becomes 2222)
>> include/linux/atomic/atomic-instrumented.h:1054:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes d)
>> include/linux/atomic/atomic-instrumented.h:1054:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes d00d)
>> include/linux/atomic/atomic-instrumented.h:1054:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes c001d00d)
include/linux/atomic/atomic-instrumented.h:1061:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes d)
include/linux/atomic/atomic-instrumented.h:1061:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes d00d)
include/linux/atomic/atomic-instrumented.h:1061:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes c001d00d)
include/linux/atomic/atomic-instrumented.h:1068:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes d)
include/linux/atomic/atomic-instrumented.h:1068:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes d00d)
include/linux/atomic/atomic-instrumented.h:1068:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes c001d00d)
include/linux/atomic/atomic-instrumented.h:1075:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes d)
include/linux/atomic/atomic-instrumented.h:1075:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes d00d)
include/linux/atomic/atomic-instrumented.h:1075:16: sparse: sparse: cast truncates bits from constant value (aaa31337c001d00d becomes c001d00d)
>> include/linux/atomic/atomic-instrumented.h:1054:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes 1)
>> include/linux/atomic/atomic-instrumented.h:1054:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes f001)
>> include/linux/atomic/atomic-instrumented.h:1054:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes f00df001)
include/linux/atomic/atomic-instrumented.h:1061:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes 1)
include/linux/atomic/atomic-instrumented.h:1061:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes f001)
include/linux/atomic/atomic-instrumented.h:1061:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes f00df001)
include/linux/atomic/atomic-instrumented.h:1068:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes 1)
include/linux/atomic/atomic-instrumented.h:1068:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes f001)
include/linux/atomic/atomic-instrumented.h:1068:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes f00df001)
include/linux/atomic/atomic-instrumented.h:1075:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes 1)
include/linux/atomic/atomic-instrumented.h:1075:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes f001)
include/linux/atomic/atomic-instrumented.h:1075:16: sparse: sparse: cast truncates bits from constant value (faceabadf00df001 becomes f00df001)

vim +476 include/linux/atomic/atomic-instrumented.h

aa525d063851a9 include/asm-generic/atomic-instrumented.h Mark Rutland 2018-09-04 471
c020395b6634b7 include/asm-generic/atomic-instrumented.h Marco Elver 2019-11-26 472 static __always_inline int
aa525d063851a9 include/asm-generic/atomic-instrumented.h Mark Rutland 2018-09-04 473 atomic_cmpxchg(atomic_t *v, int old, int new)
aa525d063851a9 include/asm-generic/atomic-instrumented.h Mark Rutland 2018-09-04 474 {
3570a1bcf45e9a include/asm-generic/atomic-instrumented.h Marco Elver 2020-07-24 475 instrument_atomic_read_write(v, sizeof(*v));
aa525d063851a9 include/asm-generic/atomic-instrumented.h Mark Rutland 2018-09-04 @476 return arch_atomic_cmpxchg(v, old, new);
aa525d063851a9 include/asm-generic/atomic-instrumented.h Mark Rutland 2018-09-04 477 }
aa525d063851a9 include/asm-generic/atomic-instrumented.h Mark Rutland 2018-09-04 478

:::::: The code at line 476 was first introduced by commit
:::::: aa525d063851a98e020b827fdd1d7776ae652301 locking/atomics: Switch to generated instrumentation

:::::: TO: Mark Rutland <mark.rutland@xxxxxxx>
:::::: CC: Ingo Molnar <mingo@xxxxxxxxxx>

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