diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 39 |
1 files changed, 36 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 34ee5f2e3271..45b6ea069f92 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -205,12 +205,23 @@ EXPORT_SYMBOL_GPL(flush_fp_to_thread); void enable_kernel_fp(void) { + unsigned long cpumsr; + WARN_ON(preemptible()); - msr_check_and_set(MSR_FP); + cpumsr = msr_check_and_set(MSR_FP); if (current->thread.regs && (current->thread.regs->msr & MSR_FP)) { check_if_tm_restore_required(current); + /* + * If a thread has already been reclaimed then the + * checkpointed registers are on the CPU but have definitely + * been saved by the reclaim code. Don't need to and *cannot* + * giveup as this would save to the 'live' structure not the + * checkpointed structure. + */ + if(!msr_tm_active(cpumsr) && msr_tm_active(current->thread.regs->msr)) + return; __giveup_fpu(current); } } @@ -257,12 +268,23 @@ EXPORT_SYMBOL(giveup_altivec); void enable_kernel_altivec(void) { + unsigned long cpumsr; + WARN_ON(preemptible()); - msr_check_and_set(MSR_VEC); + cpumsr = msr_check_and_set(MSR_VEC); if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) { check_if_tm_restore_required(current); + /* + * If a thread has already been reclaimed then the + * checkpointed registers are on the CPU but have definitely + * been saved by the reclaim code. Don't need to and *cannot* + * giveup as this would save to the 'live' structure not the + * checkpointed structure. + */ + if(!msr_tm_active(cpumsr) && msr_tm_active(current->thread.regs->msr)) + return; __giveup_altivec(current); } } @@ -331,12 +353,23 @@ static void save_vsx(struct task_struct *tsk) void enable_kernel_vsx(void) { + unsigned long cpumsr; + WARN_ON(preemptible()); - msr_check_and_set(MSR_FP|MSR_VEC|MSR_VSX); + cpumsr = msr_check_and_set(MSR_FP|MSR_VEC|MSR_VSX); if (current->thread.regs && (current->thread.regs->msr & MSR_VSX)) { check_if_tm_restore_required(current); + /* + * If a thread has already been reclaimed then the + * checkpointed registers are on the CPU but have definitely + * been saved by the reclaim code. Don't need to and *cannot* + * giveup as this would save to the 'live' structure not the + * checkpointed structure. + */ + if(!msr_tm_active(cpumsr) && msr_tm_active(current->thread.regs->msr)) + return; if (current->thread.regs->msr & MSR_FP) __giveup_fpu(current); if (current->thread.regs->msr & MSR_VEC) |