Re: [PATCH v4 6/8] arm: Break cyclic percpu include

[Will Deacon]

On Tue, Jun 23, 2020 at 10:36:51AM +0200, Peter Zijlstra wrote:
> In order to use <asm/percpu.h> in irqflags.h, we need to make sure
> asm/percpu.h does not itself depend on irqflags.h.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
> ---
>  arch/arm/include/asm/percpu.h |    2 ++
>  1 file changed, 2 insertions(+)
> 
> --- a/arch/arm/include/asm/percpu.h
> +++ b/arch/arm/include/asm/percpu.h
> @@ -10,6 +10,8 @@
>   * in the TPIDRPRW. TPIDRPRW only exists on V6K and V7
>   */
>  #if defined(CONFIG_SMP) && !defined(CONFIG_CPU_V6)
> +register unsigned long current_stack_pointer asm ("sp");

If you define this unconditionally, then we can probably get rid of the
copy in asm/thread_info.h, rather than duplicate the same #define.

Will