diff options
Diffstat (limited to 'arch/powerpc/include/asm/mmu_context.h')
| -rw-r--r-- | arch/powerpc/include/asm/mmu_context.h | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h index 051b3d63afe3..3a15b6db9501 100644 --- a/arch/powerpc/include/asm/mmu_context.h +++ b/arch/powerpc/include/asm/mmu_context.h @@ -92,15 +92,23 @@ static inline void dec_mm_active_cpus(struct mm_struct *mm) static inline void mm_context_add_copro(struct mm_struct *mm) { /* - * On hash, should only be called once over the lifetime of - * the context, as we can't decrement the active cpus count - * and flush properly for the time being. + * If any copro is in use, increment the active CPU count + * in order to force TLB invalidations to be global as to + * propagate to the Nest MMU. */ - inc_mm_active_cpus(mm); + if (atomic_inc_return(&mm->context.copros) == 1) + inc_mm_active_cpus(mm); } static inline void mm_context_remove_copro(struct mm_struct *mm) { + int c; + + c = atomic_dec_if_positive(&mm->context.copros); + + /* Detect imbalance between add and remove */ + WARN_ON(c < 0); + /* * Need to broadcast a global flush of the full mm before * decrementing active_cpus count, as the next TLBI may be @@ -111,7 +119,7 @@ static inline void mm_context_remove_copro(struct mm_struct *mm) * for the time being. Invalidations will remain global if * used on hash. */ - if (radix_enabled()) { + if (c == 0 && radix_enabled()) { flush_all_mm(mm); dec_mm_active_cpus(mm); } |