diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-02-25 22:09:41 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-02-25 22:09:41 +0000 |
| commit | 2741ecb4ce5c2d430b5c44b0a169038338c21df5 (patch) | |
| tree | 4aa71d7551184ee88f32c7f3660d821133058c32 /arch/arm/include/asm/mmu_context.h | |
| parent | bc85e585c6d0fab4bde12d60964b2f25802c3163 (diff) | |
| parent | 5de813b6cd06460b337f9da9afe316823cf3ef45 (diff) | |
| download | op-kernel-dev-2741ecb4ce5c2d430b5c44b0a169038338c21df5.zip op-kernel-dev-2741ecb4ce5c2d430b5c44b0a169038338c21df5.tar.gz | |
Merge branch 'misc2' into devel
Diffstat (limited to 'arch/arm/include/asm/mmu_context.h')
| -rw-r--r-- | arch/arm/include/asm/mmu_context.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm/include/asm/mmu_context.h b/arch/arm/include/asm/mmu_context.h index de6cefb..a0b3cac 100644 --- a/arch/arm/include/asm/mmu_context.h +++ b/arch/arm/include/asm/mmu_context.h @@ -43,12 +43,23 @@ void __check_kvm_seq(struct mm_struct *mm); #define ASID_FIRST_VERSION (1 << ASID_BITS) extern unsigned int cpu_last_asid; +#ifdef CONFIG_SMP +DECLARE_PER_CPU(struct mm_struct *, current_mm); +#endif void __init_new_context(struct task_struct *tsk, struct mm_struct *mm); void __new_context(struct mm_struct *mm); static inline void check_context(struct mm_struct *mm) { + /* + * This code is executed with interrupts enabled. Therefore, + * mm->context.id cannot be updated to the latest ASID version + * on a different CPU (and condition below not triggered) + * without first getting an IPI to reset the context. The + * alternative is to take a read_lock on mm->context.id_lock + * (after changing its type to rwlock_t). + */ if (unlikely((mm->context.id ^ cpu_last_asid) >> ASID_BITS)) __new_context(mm); @@ -108,6 +119,10 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next, __flush_icache_all(); #endif if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)) || prev != next) { +#ifdef CONFIG_SMP + struct mm_struct **crt_mm = &per_cpu(current_mm, cpu); + *crt_mm = next; +#endif check_context(next); cpu_switch_mm(next->pgd, next); if (cache_is_vivt()) |
