> /* N.B. the only way to get here is from the beq following ret_from_except.
> */
> resume_kernel:
> - /* check current_thread_info->preempt_count */
> + /* check current_thread_info, _TIF_EMULATE_STACK_STORE */
> CURRENT_THREAD_INFO(r9, r1)
> + lwz r8,TI_FLAGS(r9)
> + andis. r8,r8,_TIF_EMULATE_STACK_STORE@h
> + beq+ 1f
...
> +1:
Does this add a statically mispredicted branch to every
return to userspace ?
Or is there an earlier check for 'unlikely' conditions.
David
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