diff options
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/include/asm/spinlock.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arc/include/asm/spinlock.h b/arch/arc/include/asm/spinlock.h index 233d5ffe6ec7..968c730ef114 100644 --- a/arch/arc/include/asm/spinlock.h +++ b/arch/arc/include/asm/spinlock.h @@ -296,6 +296,12 @@ static inline void arch_spin_unlock(arch_spinlock_t *lock) */ smp_mb(); + /* + * EX is not really required here, a simple STore of 0 suffices. + * However this causes tasklist livelocks in SystemC based SMP virtual + * platforms where the systemc core scheduler uses EX as a cue for + * moving to next core. Do a git log of this file for details + */ __asm__ __volatile__( " ex %0, [%1] \n" : "+r" (val) |