Re: [PATCH bpf-next v2 18/26] rqspinlock: Add entry to Makefile, MAINTAINERS

kernel test robot
2025-02-07T14:46:21Z

Hi Kumar,

kernel test robot noticed the following build errors:

[auto build test ERROR on 0abff462d802a352c87b7f5e71b442b09bf9cfff]

url: https://github.com/intel-lab-lkp/linux/commits/Kumar-Kartikeya-Dwivedi/locking-Move-MCS-struct-definition-to-public-header/20250206-190258
base: 0abff462d802a352c87b7f5e71b442b09bf9cfff
patch link: https://lore.kernel.org/r/20250206105435.2159977-19-memxor%40gmail.com
patch subject: [PATCH bpf-next v2 18/26] rqspinlock: Add entry to Makefile, MAINTAINERS
config: arm-randconfig-001-20250207 (https://download.01.org/0day-ci/archive/20250207/202502072210.Fzbbpkun-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250207/202502072210.Fzbbpkun-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202502072210.Fzbbpkun-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

In file included from kernel/locking/rqspinlock.c:77:
>> kernel/locking/mcs_spinlock.h:57:27: warning: 'struct mcs_spinlock' declared inside parameter list will not be visible outside of this definition or declaration
57 | void mcs_spin_lock(struct mcs_spinlock **lock, struct mcs_spinlock *node)
| ^~~~~~~~~~~~
kernel/locking/mcs_spinlock.h: In function 'mcs_spin_lock':
>> kernel/locking/mcs_spinlock.h:62:13: error: invalid use of undefined type 'struct mcs_spinlock'
62 | node->locked = 0;
| ^~
kernel/locking/mcs_spinlock.h:63:13: error: invalid use of undefined type 'struct mcs_spinlock'
63 | node->next = NULL;
| ^~
In file included from <command-line>:
kernel/locking/mcs_spinlock.h:83:24: error: invalid use of undefined type 'struct mcs_spinlock'
83 | WRITE_ONCE(prev->next, node);
| ^~
include/linux/compiler_types.h:522:23: note: in definition of macro '__compiletime_assert'
522 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:542:9: note: in expansion of macro '_compiletime_assert'
542 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:60:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
60 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/locking/mcs_spinlock.h:83:9: note: in expansion of macro 'WRITE_ONCE'
83 | WRITE_ONCE(prev->next, node);
| ^~~~~~~~~~
kernel/locking/mcs_spinlock.h:83:24: error: invalid use of undefined type 'struct mcs_spinlock'
83 | WRITE_ONCE(prev->next, node);
| ^~
include/linux/compiler_types.h:522:23: note: in definition of macro '__compiletime_assert'
522 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:542:9: note: in expansion of macro '_compiletime_assert'
542 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:60:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
60 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/locking/mcs_spinlock.h:83:9: note: in expansion of macro 'WRITE_ONCE'
83 | WRITE_ONCE(prev->next, node);
| ^~~~~~~~~~
kernel/locking/mcs_spinlock.h:83:24: error: invalid use of undefined type 'struct mcs_spinlock'
83 | WRITE_ONCE(prev->next, node);
| ^~
include/linux/compiler_types.h:522:23: note: in definition of macro '__compiletime_assert'
522 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:542:9: note: in expansion of macro '_compiletime_assert'
542 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:60:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
60 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/locking/mcs_spinlock.h:83:9: note: in expansion of macro 'WRITE_ONCE'
83 | WRITE_ONCE(prev->next, node);
| ^~~~~~~~~~
kernel/locking/mcs_spinlock.h:83:24: error: invalid use of undefined type 'struct mcs_spinlock'
83 | WRITE_ONCE(prev->next, node);
| ^~
include/linux/compiler_types.h:522:23: note: in definition of macro '__compiletime_assert'
522 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:542:9: note: in expansion of macro '_compiletime_assert'
542 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:60:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
60 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/locking/mcs_spinlock.h:83:9: note: in expansion of macro 'WRITE_ONCE'
83 | WRITE_ONCE(prev->next, node);
| ^~~~~~~~~~
kernel/locking/mcs_spinlock.h:83:24: error: invalid use of undefined type 'struct mcs_spinlock'
83 | WRITE_ONCE(prev->next, node);
| ^~
include/linux/compiler_types.h:522:23: note: in definition of macro '__compiletime_assert'
522 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:542:9: note: in expansion of macro '_compiletime_assert'
542 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'

vim +62 kernel/locking/mcs_spinlock.h

e207552e64ea05 include/linux/mcs_spinlock.h Will Deacon 2014-01-21 39
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 40 /*
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 41 * Note: the smp_load_acquire/smp_store_release pair is not
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 42 * sufficient to form a full memory barrier across
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 43 * cpus for many architectures (except x86) for mcs_unlock and mcs_lock.
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 44 * For applications that need a full barrier across multiple cpus
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 45 * with mcs_unlock and mcs_lock pair, smp_mb__after_unlock_lock() should be
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 46 * used after mcs_lock.
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 47 */
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 48
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 49 /*
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 50 * In order to acquire the lock, the caller should declare a local node and
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 51 * pass a reference of the node to this function in addition to the lock.
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 52 * If the lock has already been acquired, then this will proceed to spin
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 53 * on this node->locked until the previous lock holder sets the node->locked
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 54 * in mcs_spin_unlock().
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 55 */
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 56 static inline
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 @57 void mcs_spin_lock(struct mcs_spinlock **lock, struct mcs_spinlock *node)
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 58 {
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 59 struct mcs_spinlock *prev;
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 60
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 61 /* Init node */
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 @62 node->locked = 0;
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 63 node->next = NULL;
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 64
920c720aa5aa39 kernel/locking/mcs_spinlock.h Peter Zijlstra 2016-02-01 65 /*
920c720aa5aa39 kernel/locking/mcs_spinlock.h Peter Zijlstra 2016-02-01 66 * We rely on the full barrier with global transitivity implied by the
920c720aa5aa39 kernel/locking/mcs_spinlock.h Peter Zijlstra 2016-02-01 67 * below xchg() to order the initialization stores above against any
920c720aa5aa39 kernel/locking/mcs_spinlock.h Peter Zijlstra 2016-02-01 68 * observation of @node. And to provide the ACQUIRE ordering associated
920c720aa5aa39 kernel/locking/mcs_spinlock.h Peter Zijlstra 2016-02-01 69 * with a LOCK primitive.
920c720aa5aa39 kernel/locking/mcs_spinlock.h Peter Zijlstra 2016-02-01 70 */
920c720aa5aa39 kernel/locking/mcs_spinlock.h Peter Zijlstra 2016-02-01 71 prev = xchg(lock, node);
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 72 if (likely(prev == NULL)) {
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 73 /*
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 74 * Lock acquired, don't need to set node->locked to 1. Threads
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 75 * only spin on its own node->locked value for lock acquisition.
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 76 * However, since this thread can immediately acquire the lock
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 77 * and does not proceed to spin on its own node->locked, this
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 78 * value won't be used. If a debug mode is needed to
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 79 * audit lock status, then set node->locked value here.
5faeb8adb956a5 include/linux/mcs_spinlock.h Jason Low 2014-01-21 80 */
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 81 return;
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 82 }
4d3199e4ca8e66 kernel/locking/mcs_spinlock.h Davidlohr Bueso 2015-02-22 83 WRITE_ONCE(prev->next, node);
e207552e64ea05 include/linux/mcs_spinlock.h Will Deacon 2014-01-21 84
e207552e64ea05 include/linux/mcs_spinlock.h Will Deacon 2014-01-21 85 /* Wait until the lock holder passes the lock down. */
e207552e64ea05 include/linux/mcs_spinlock.h Will Deacon 2014-01-21 86 arch_mcs_spin_lock_contended(&node->locked);
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 87 }
e72246748ff006 include/linux/mcs_spinlock.h Tim Chen 2014-01-21 88

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