arch/mips/include/asm/bitops.h:104:2: warning: used $at (currently $1) without ".set noat"
From: kernel test robot
Date: Thu Feb 19 2026 - 03:00:51 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 956b9cbd7f156c8672dac94a00de3c6a0939c692
commit: 511b3b644e28d9b66e32515a74c57ff599e89035 nvmet: pci-epf: move DMA initialization to EPC init callback
date: 3 months ago
config: mips-randconfig-r111-20260219 (https://download.01.org/0day-ci/archive/20260219/202602191524.ahByivoK-lkp@xxxxxxxxx/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project e86750b29fa0ff207cd43213d66dabe565417638)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260219/202602191524.ahByivoK-lkp@xxxxxxxxx/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 <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602191524.ahByivoK-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
In file included from drivers/nvme/target/pci-epf.c:11:
In file included from include/linux/delay.h:12:
In file included from include/linux/math.h:6:
In file included from arch/mips/include/asm/div64.h:89:
In file included from include/asm-generic/div64.h:55:
In file included from include/linux/log2.h:12:
In file included from include/linux/bitops.h:67:
>> arch/mips/include/asm/bitops.h:104:2: warning: used $at (currently $1) without ".set noat" [-Winline-asm]
104 | __bit_op(*m, "or\t%0, %2", "ir"(BIT(bit)));
| ^
arch/mips/include/asm/bitops.h:33:3: note: expanded from macro '__bit_op'
33 | "1: " __stringify(LONG_LL) " %0, %1 \n" \
| ^
<inline asm>:4:13: note: instantiated into assembly here
4 | 1: ll $3, 0($1)
| ^
In file included from drivers/nvme/target/pci-epf.c:11:
In file included from include/linux/delay.h:12:
In file included from include/linux/math.h:6:
In file included from arch/mips/include/asm/div64.h:89:
In file included from include/asm-generic/div64.h:55:
In file included from include/linux/log2.h:12:
In file included from include/linux/bitops.h:67:
>> arch/mips/include/asm/bitops.h:104:2: warning: used $at (currently $1) without ".set noat" [-Winline-asm]
104 | __bit_op(*m, "or\t%0, %2", "ir"(BIT(bit)));
| ^
arch/mips/include/asm/bitops.h:35:3: note: expanded from macro '__bit_op'
35 | " " __stringify(LONG_SC) " %0, %1 \n" \
| ^
<inline asm>:6:11: note: instantiated into assembly here
6 | sc $3, 0($1)
| ^
2 warnings generated.
vim +104 arch/mips/include/asm/bitops.h
cc99987c375e49 arch/mips/include/asm/bitops.h Paul Burton 2019-10-01 62
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 63 /*
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 64 * These are the "slower" versions of the functions and are in bitops.c.
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 65 * These functions call raw_local_irq_{save,restore}().
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 66 */
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 67 void __mips_set_bit(unsigned long nr, volatile unsigned long *addr);
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 68 void __mips_clear_bit(unsigned long nr, volatile unsigned long *addr);
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 69 void __mips_change_bit(unsigned long nr, volatile unsigned long *addr);
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 70 int __mips_test_and_set_bit_lock(unsigned long nr,
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 71 volatile unsigned long *addr);
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 72 int __mips_test_and_clear_bit(unsigned long nr,
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 73 volatile unsigned long *addr);
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 74 int __mips_test_and_change_bit(unsigned long nr,
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 75 volatile unsigned long *addr);
8da36b26e3d864 arch/mips/include/asm/bitops.h Matthew Wilcox (Oracle 2023-10-04 76) bool __mips_xor_is_negative_byte(unsigned long mask,
8da36b26e3d864 arch/mips/include/asm/bitops.h Matthew Wilcox (Oracle 2023-10-04 77) volatile unsigned long *addr);
92d11594f688c8 arch/mips/include/asm/bitops.h Jim Quinlan 2012-09-06 78
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 79 /*
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 80 * set_bit - Atomically set a bit in memory
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 81 * @nr: the bit to set
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 82 * @addr: the address to start counting from
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 83 *
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 84 * This function is atomic and may not be reordered. See __set_bit()
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 85 * if you do not require the atomic guarantees.
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 86 * Note that @nr may be almost arbitrarily large; this function is not
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 87 * restricted to acting on a single-word quantity.
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 88 */
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 89 static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 90 {
c042be02d73053 arch/mips/include/asm/bitops.h Paul Burton 2019-10-01 91 volatile unsigned long *m = &addr[BIT_WORD(nr)];
c042be02d73053 arch/mips/include/asm/bitops.h Paul Burton 2019-10-01 92 int bit = nr % BITS_PER_LONG;
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 93
fe7cd97e68fac1 arch/mips/include/asm/bitops.h Paul Burton 2019-10-01 94 if (!kernel_uses_llsc) {
fe7cd97e68fac1 arch/mips/include/asm/bitops.h Paul Burton 2019-10-01 95 __mips_set_bit(nr, addr);
fe7cd97e68fac1 arch/mips/include/asm/bitops.h Paul Burton 2019-10-01 96 return;
fe7cd97e68fac1 arch/mips/include/asm/bitops.h Paul Burton 2019-10-01 97 }
fe7cd97e68fac1 arch/mips/include/asm/bitops.h Paul Burton 2019-10-01 98
59361e9975fd56 arch/mips/include/asm/bitops.h Paul Burton 2019-10-01 99 if ((MIPS_ISA_REV >= 2) && __builtin_constant_p(bit) && (bit >= 16)) {
f0b7ddbd794bdf arch/mips/include/asm/bitops.h Huang Pei 2021-12-15 100 __bit_op(*m, __stringify(LONG_INS) " %0, %3, %2, 1", "i"(bit), "r"(~0));
fe7cd97e68fac1 arch/mips/include/asm/bitops.h Paul Burton 2019-10-01 101 return;
fe7cd97e68fac1 arch/mips/include/asm/bitops.h Paul Burton 2019-10-01 102 }
fe7cd97e68fac1 arch/mips/include/asm/bitops.h Paul Burton 2019-10-01 103
cc99987c375e49 arch/mips/include/asm/bitops.h Paul Burton 2019-10-01 @104 __bit_op(*m, "or\t%0, %2", "ir"(BIT(bit)));
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 105 }
^1da177e4c3f41 include/asm-mips/bitops.h Linus Torvalds 2005-04-16 106
:::::: The code at line 104 was first introduced by commit
:::::: cc99987c375e499a95572504d69c215591222072 MIPS: bitops: Abstract LL/SC loops
:::::: TO: Paul Burton <paul.burton@xxxxxxxx>
:::::: CC: Paul Burton <paul.burton@xxxxxxxx>
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