[paulmck-rcu:dev.2024.04.18a 34/34] arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct request *' makes integer from pointer without a cast

From: kernel test robot
Date: Wed May 01 2024 - 07:08:19 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2024.04.18a
head: 274af360588db0dafe36ffb5c61799fa77757ce7
commit: 274af360588db0dafe36ffb5c61799fa77757ce7 [34/34] fixup! xtensa: Emulate one-byte cmpxchg
config: arc-allnoconfig (https://download.01.org/0day-ci/archive/20240501/202405011801.nWVMOtGS-lkp@xxxxxxxxx/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240501/202405011801.nWVMOtGS-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/202405011801.nWVMOtGS-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

In file included from arch/arc/include/asm/atomic.h:13,
from include/linux/atomic.h:7,
from include/asm-generic/bitops/lock.h:5,
from arch/arc/include/asm/bitops.h:188,
from include/linux/bitops.h:68,
from include/linux/kernel.h:23,
from block/blk-mq.c:8:
block/blk-mq.c: In function 'blk_mq_clear_rq_mapping':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct request *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4788:9: note: in expansion of macro 'raw_cmpxchg'
4788 | raw_cmpxchg(__ai_ptr, __VA_ARGS__); \
| ^~~~~~~~~~~
block/blk-mq.c:3237:33: note: in expansion of macro 'cmpxchg'
3237 | cmpxchg(&drv_tags->rqs[i], rq, NULL);
| ^~~~~~~
block/blk-mq.c: In function 'blk_mq_clear_flush_rq_mapping':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct request *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4788:9: note: in expansion of macro 'raw_cmpxchg'
4788 | raw_cmpxchg(__ai_ptr, __VA_ARGS__); \
| ^~~~~~~~~~~
block/blk-mq.c:3602:17: note: in expansion of macro 'cmpxchg'
3602 | cmpxchg(&tags->rqs[i], flush_rq, NULL);
| ^~~~~~~
--
In file included from arch/arc/include/asm/atomic.h:13,
from include/linux/atomic.h:7,
from include/asm-generic/bitops/lock.h:5,
from arch/arc/include/asm/bitops.h:188,
from include/linux/bitops.h:68,
from include/linux/thread_info.h:27,
from include/asm-generic/preempt.h:5,
from ./arch/arc/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:79,
from include/linux/spinlock.h:56,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:7,
from include/linux/slab.h:16,
from fs/super.c:25:
fs/super.c: In function 'sb_init_dio_done_wq':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct workqueue_struct *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4788:9: note: in expansion of macro 'raw_cmpxchg'
4788 | raw_cmpxchg(__ai_ptr, __VA_ARGS__); \
| ^~~~~~~~~~~
fs/super.c:2222:15: note: in expansion of macro 'cmpxchg'
2222 | old = cmpxchg(&sb->s_dio_done_wq, NULL, wq);
| ^~~~~~~
--
In file included from arch/arc/include/asm/atomic.h:13,
from include/linux/atomic.h:7,
from include/asm-generic/bitops/lock.h:5,
from arch/arc/include/asm/bitops.h:188,
from include/linux/bitops.h:68,
from include/linux/thread_info.h:27,
from include/asm-generic/preempt.h:5,
from ./arch/arc/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:79,
from include/linux/spinlock.h:56,
from include/linux/wait.h:9,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from include/linux/highmem.h:5,
from include/linux/bvec.h:10,
from include/linux/blk_types.h:10,
from include/linux/blkdev.h:9,
from fs/libfs.c:7:
fs/libfs.c: In function 'stash_dentry':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct dentry *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4788:9: note: in expansion of macro 'raw_cmpxchg'
4788 | raw_cmpxchg(__ai_ptr, __VA_ARGS__); \
| ^~~~~~~~~~~
fs/libfs.c:2054:23: note: in expansion of macro 'cmpxchg'
2054 | old = cmpxchg(stashed, NULL, dentry);
| ^~~~~~~
In file included from include/linux/export.h:5,
from include/linux/linkage.h:7,
from include/linux/fs.h:5:
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct dentry *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/compiler.h:76:45: note: in definition of macro 'likely'
76 | # define likely(x) __builtin_expect(!!(x), 1)
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
| ^~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
| ^~~~~~~~~~~~~~~
fs/libfs.c:2063:28: note: in expansion of macro 'try_cmpxchg'
2063 | if (likely(try_cmpxchg(stashed, &old, dentry)))
| ^~~~~~~~~~~
fs/libfs.c: In function 'stashed_dentry_prune':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct dentry *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4788:9: note: in expansion of macro 'raw_cmpxchg'
4788 | raw_cmpxchg(__ai_ptr, __VA_ARGS__); \
| ^~~~~~~~~~~
fs/libfs.c:2131:9: note: in expansion of macro 'cmpxchg'
2131 | cmpxchg(stashed, dentry, NULL);
| ^~~~~~~
--
In file included from arch/arc/include/asm/atomic.h:13,
from include/linux/atomic.h:7,
from include/asm-generic/bitops/lock.h:5,
from arch/arc/include/asm/bitops.h:188,
from include/linux/bitops.h:68,
from include/linux/kernel.h:23,
from fs/eventpoll.c:10:
fs/eventpoll.c: In function 'list_add_tail_lockless':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct list_head *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
| ^~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
| ^~~~~~~~~~~~~~~
fs/eventpoll.c:1206:14: note: in expansion of macro 'try_cmpxchg'
1206 | if (!try_cmpxchg(&new->next, &new, head))
| ^~~~~~~~~~~
fs/eventpoll.c: In function 'chain_epi_lockless':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct epitem *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4788:9: note: in expansion of macro 'raw_cmpxchg'
4788 | raw_cmpxchg(__ai_ptr, __VA_ARGS__); \
| ^~~~~~~~~~~
fs/eventpoll.c:1245:13: note: in expansion of macro 'cmpxchg'
1245 | if (cmpxchg(&epi->next, EP_UNACTIVE_PTR, NULL) != EP_UNACTIVE_PTR)
| ^~~~~~~
--
In file included from arch/arc/include/asm/atomic.h:13,
from include/linux/atomic.h:7,
from include/asm-generic/bitops/lock.h:5,
from arch/arc/include/asm/bitops.h:188,
from include/linux/bitops.h:68,
from include/linux/thread_info.h:27,
from include/asm-generic/preempt.h:5,
from ./arch/arc/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:79,
from include/linux/spinlock.h:56,
from include/linux/fdtable.h:11,
from fs/locks.c:53:
fs/locks.c: In function 'locks_get_lock_context':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct file_lock_context *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4788:9: note: in expansion of macro 'raw_cmpxchg'
4788 | raw_cmpxchg(__ai_ptr, __VA_ARGS__); \
| ^~~~~~~~~~~
fs/locks.c:199:13: note: in expansion of macro 'cmpxchg'
199 | if (cmpxchg(&inode->i_flctx, NULL, ctx)) {
| ^~~~~~~
--
In file included from arch/arc/include/asm/atomic.h:13,
from include/linux/atomic.h:7,
from include/asm-generic/bitops/lock.h:5,
from arch/arc/include/asm/bitops.h:188,
from include/linux/bitops.h:68,
from include/linux/thread_info.h:27,
from include/asm-generic/preempt.h:5,
from ./arch/arc/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:79,
from include/linux/spinlock.h:56,
from kernel/task_work.c:2:
kernel/task_work.c: In function 'task_work_add':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct callback_head *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
| ^~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
| ^~~~~~~~~~~~~~~
kernel/task_work.c:55:19: note: in expansion of macro 'try_cmpxchg'
55 | } while (!try_cmpxchg(&task->task_works, &head, work));
| ^~~~~~~~~~~
kernel/task_work.c: In function 'task_work_cancel_match':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct callback_head *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
| ^~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
| ^~~~~~~~~~~~~~~
kernel/task_work.c:109:28: note: in expansion of macro 'try_cmpxchg'
109 | } else if (try_cmpxchg(pprev, &work, work->next))
| ^~~~~~~~~~~
kernel/task_work.c: In function 'task_work_run':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct callback_head *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
| ^~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
| ^~~~~~~~~~~~~~~
kernel/task_work.c:166:27: note: in expansion of macro 'try_cmpxchg'
166 | } while (!try_cmpxchg(&task->task_works, &work, head));
| ^~~~~~~~~~~
--
In file included from arch/arc/include/asm/atomic.h:13,
from include/linux/atomic.h:7,
from include/asm-generic/bitops/lock.h:5,
from arch/arc/include/asm/bitops.h:188,
from include/linux/bitops.h:68,
from include/linux/kernel.h:23,
from lib/llist.c:13:
lib/llist.c: In function 'llist_add_batch':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct llist_node *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
| ^~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
| ^~~~~~~~~~~~~~~
lib/llist.c:33:19: note: in expansion of macro 'try_cmpxchg'
33 | } while (!try_cmpxchg(&head->first, &first, new_first));
| ^~~~~~~~~~~
lib/llist.c: In function 'llist_del_first':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct llist_node *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
| ^~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
| ^~~~~~~~~~~~~~~
lib/llist.c:62:19: note: in expansion of macro 'try_cmpxchg'
62 | } while (!try_cmpxchg(&head->first, &entry, next));
| ^~~~~~~~~~~
lib/llist.c: In function 'llist_del_first_this':
>> arch/arc/include/asm/cmpxchg.h:74:25: warning: assignment to 'long unsigned int' from 'struct llist_node *' makes integer from pointer without a cast [-Wint-conversion]
74 | __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
| ^
include/linux/atomic/atomic-arch-fallback.h:55:21: note: in expansion of macro 'arch_cmpxchg'
55 | #define raw_cmpxchg arch_cmpxchg
| ^~~~~~~~~~~~
include/linux/atomic/atomic-arch-fallback.h:192:16: note: in expansion of macro 'raw_cmpxchg'
192 | ___r = raw_cmpxchg((_ptr), ___o, (_new)); \
| ^~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:4880:9: note: in expansion of macro 'raw_try_cmpxchg'
4880 | raw_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
| ^~~~~~~~~~~~~~~
lib/llist.c:90:19: note: in expansion of macro 'try_cmpxchg'
90 | } while (!try_cmpxchg(&head->first, &entry, next));
| ^~~~~~~~~~~
.

vim +74 arch/arc/include/asm/cmpxchg.h

63
64 #define arch_cmpxchg(ptr, old, new) \
65 ({ \
66 volatile __typeof__(ptr) _p_ = (ptr); \
67 __typeof__(*(ptr)) _o_ = (old); \
68 __typeof__(*(ptr)) _n_ = (new); \
69 __typeof__(*(ptr)) _prev_; \
70 unsigned long __flags; \
71 \
72 switch(sizeof((_p_))) { \
73 case 1: \
> 74 __flags = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)_p_, (uintptr_t)_o_, (uintptr_t)_n_); \
75 _prev_ = (__typeof__(*(ptr)))__flags; \
76 break; \
77 break; \
78 case 4: \
79 /* \
80 * spin lock/unlock provide the needed smp_mb() \
81 * before/after \
82 */ \
83 atomic_ops_lock(__flags); \
84 _prev_ = *_p_; \
85 if (_prev_ == _o_) \
86 *_p_ = _n_; \
87 atomic_ops_unlock(__flags); \
88 break; \
89 default: \
90 BUILD_BUG(); \
91 } \
92 \
93 _prev_; \
94 })
95

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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