Re: [PATCH] MCS spinlock: Use smp_cond_load_acquire()

Jason Low
2016-04-12T23:46:20Z

On Wed, 2016-04-13 at 06:39 +0800, kbuild test robot wrote:
> Hi Jason,
>
> [auto build test ERROR on v4.6-rc3]
> [also build test ERROR on next-20160412]
> [cannot apply to tip/core/locking]
> [if your patch is applied to the wrong git tree, please drop us a note to help improving the system]
>
> url: https://github.com/0day-ci/linux/commits/Jason-Low/MCS-spinlock-Use-smp_cond_load_acquire/20160413-053726
> config: i386-randconfig-s0-201615 (attached as .config)
> reproduce:
> # save the attached .config to linux build tree
> make ARCH=i386
>
> All error/warnings (new ones prefixed by >>):
>
> In file included from kernel/locking/qspinlock.c:70:0:
> kernel/locking/mcs_spinlock.h: In function 'mcs_spin_lock':
> >> kernel/locking/mcs_spinlock.h:31:2: error: implicit declaration of function 'smp_cond_load_acquire' [-Werror=implicit-function-declaration]
> smp_cond_load_acquire(&l, VAL); \

Hello,

This patch depends on the "smp_cond_load_acquire + cmpwait" patchset,
which is in:

git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/rfc