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Message-ID: <202111240654.4qXNBmtC-lkp@intel.com>
Date: Wed, 24 Nov 2021 06:19:48 +0800
From: kernel test robot <lkp@...el.com>
To: Mark Rutland <mark.rutland@....com>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
Peter Zijlstra <peterz@...radead.org>
Subject: include/asm-generic/cmpxchg.h:37:39: sparse: sparse: cast truncates
bits from constant value (deadbeef becomes ef)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 136057256686de39cc3a07c2e39ef6bc43003ff6
commit: c7178cdecdbef8321f418fac55f3afaca3bb4c96 locking/atomic: h8300: use asm-generic exclusively
date: 6 months ago
config: h8300-randconfig-s031-20211117 (https://download.01.org/0day-ci/archive/20211124/202111240654.4qXNBmtC-lkp@intel.com/config.gz)
compiler: h8300-linux-gcc (GCC) 11.2.0
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-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c7178cdecdbef8321f418fac55f3afaca3bb4c96
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout c7178cdecdbef8321f418fac55f3afaca3bb4c96
# save the config file to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=h8300 SHELL=/bin/bash
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
sparse warnings: (new ones prefixed by >>)
lib/atomic64_test.c: note: in included file (through arch/h8300/include/generated/asm/cmpxchg.h, include/asm-generic/atomic.h, arch/h8300/include/generated/asm/atomic.h, ...):
>> include/asm-generic/cmpxchg.h:37:39: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> include/asm-generic/cmpxchg.h:48:40: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
>> include/asm-generic/cmpxchg.h:37:39: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> include/asm-generic/cmpxchg.h:48:40: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
>> include/asm-generic/cmpxchg.h:37:39: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> include/asm-generic/cmpxchg.h:48:40: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
>> include/asm-generic/cmpxchg.h:37:39: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> include/asm-generic/cmpxchg.h:48:40: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
lib/atomic64_test.c: note: in included file (through include/asm-generic/cmpxchg.h, arch/h8300/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 (deadbeef becomes ef)
>> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
>> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
>> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
>> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
>> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
>> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
>> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
>> include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
vim +37 include/asm-generic/cmpxchg.h
b4816afa398670 David Howells 2012-03-28 24
b4816afa398670 David Howells 2012-03-28 25 static inline
b4816afa398670 David Howells 2012-03-28 26 unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
b4816afa398670 David Howells 2012-03-28 27 {
b4816afa398670 David Howells 2012-03-28 28 unsigned long ret, flags;
b4816afa398670 David Howells 2012-03-28 29
b4816afa398670 David Howells 2012-03-28 30 switch (size) {
b4816afa398670 David Howells 2012-03-28 31 case 1:
b4816afa398670 David Howells 2012-03-28 32 #ifdef __xchg_u8
b4816afa398670 David Howells 2012-03-28 33 return __xchg_u8(x, ptr);
b4816afa398670 David Howells 2012-03-28 34 #else
b4816afa398670 David Howells 2012-03-28 35 local_irq_save(flags);
b4816afa398670 David Howells 2012-03-28 36 ret = *(volatile u8 *)ptr;
b4816afa398670 David Howells 2012-03-28 @37 *(volatile u8 *)ptr = x;
b4816afa398670 David Howells 2012-03-28 38 local_irq_restore(flags);
b4816afa398670 David Howells 2012-03-28 39 return ret;
b4816afa398670 David Howells 2012-03-28 40 #endif /* __xchg_u8 */
b4816afa398670 David Howells 2012-03-28 41
b4816afa398670 David Howells 2012-03-28 42 case 2:
b4816afa398670 David Howells 2012-03-28 43 #ifdef __xchg_u16
b4816afa398670 David Howells 2012-03-28 44 return __xchg_u16(x, ptr);
b4816afa398670 David Howells 2012-03-28 45 #else
b4816afa398670 David Howells 2012-03-28 46 local_irq_save(flags);
b4816afa398670 David Howells 2012-03-28 47 ret = *(volatile u16 *)ptr;
b4816afa398670 David Howells 2012-03-28 @48 *(volatile u16 *)ptr = x;
b4816afa398670 David Howells 2012-03-28 49 local_irq_restore(flags);
b4816afa398670 David Howells 2012-03-28 50 return ret;
b4816afa398670 David Howells 2012-03-28 51 #endif /* __xchg_u16 */
b4816afa398670 David Howells 2012-03-28 52
b4816afa398670 David Howells 2012-03-28 53 case 4:
b4816afa398670 David Howells 2012-03-28 54 #ifdef __xchg_u32
b4816afa398670 David Howells 2012-03-28 55 return __xchg_u32(x, ptr);
b4816afa398670 David Howells 2012-03-28 56 #else
b4816afa398670 David Howells 2012-03-28 57 local_irq_save(flags);
b4816afa398670 David Howells 2012-03-28 58 ret = *(volatile u32 *)ptr;
b4816afa398670 David Howells 2012-03-28 59 *(volatile u32 *)ptr = x;
b4816afa398670 David Howells 2012-03-28 60 local_irq_restore(flags);
b4816afa398670 David Howells 2012-03-28 61 return ret;
b4816afa398670 David Howells 2012-03-28 62 #endif /* __xchg_u32 */
b4816afa398670 David Howells 2012-03-28 63
:::::: The code at line 37 was first introduced by commit
:::::: b4816afa3986704d1404fc48e931da5135820472 Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h
:::::: TO: David Howells <dhowells@...hat.com>
:::::: CC: David Howells <dhowells@...hat.com>
---
0-DAY CI Kernel Test Service, Intel Corporation
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