On 25/06/2015 18:12, Andrew Jones wrote:
> spinlock torture tests made it clear that checking mmu_enabled()
> every time we call spin_lock is a bad idea. As most tests will
> want the MMU enabled the entire time, then just hard code
> mmu_enabled() to true. Tests that want to play with the MMU can
> be compiled with CONFIG_MAY_DISABLE_MMU to get the actual check
> back.
This doesn't work if you compile mmu.o just once. Can you make
something like
static inline bool mmu_enabled(void)
{
return disabled_mmu_cpu_count == 0 || __mmu_enabled();
}
...
bool __mmu_enabled(void)
{
struct thread_info *ti = current_thread_info();
return cpumask_test_cpu(ti->cpu, &mmu_enabled_cpumask);
}
?
Paolo
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