Re: [PATCH] Avoid mutex starvation when optimistic spinning is disabled

kbuild test robot
2016-08-23T08:41:32Z

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Hi Jason,

[auto build test ERROR on tip/locking/core]
[also build test ERROR on v4.8-rc3 next-20160823]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url: https://github.com/0day-ci/linux/commits/Maarten-Lankhorst/Avoid-mutex-starvation-when-optimistic-spinning-is-disabled/20160823-161801
config: x86_64-randconfig-x013-201634 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

All errors (new ones prefixed by >>):

kernel/locking/mutex.c: In function '__mutex_lock_common':
>> kernel/locking/mutex.c:638:7: error: 'struct mutex' has no member named 'yield_to_waiter'
lock->yield_to_waiter = false;
^~

vim +638 kernel/locking/mutex.c

632 /* set it to 0 if there are no waiters left: */
633 if (likely(list_empty(&lock->wait_list)))
634 atomic_set(&lock->count, 0);
635 debug_mutex_free_waiter(&waiter);
636
637 if (yield_forced)
> 638 lock->yield_to_waiter = false;
639
640 skip_wait:
641 /* got the lock - cleanup and rejoice! */

---
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