On Wed, Jun 24, 2020 at 07:53:20PM +0200, Peter Zijlstra wrote:

On Tue, Jun 23, 2020 at 10:02:57AM +0100, Will Deacon wrote:

quoted

On Tue, Jun 23, 2020 at 10:36:51AM +0200, Peter Zijlstra wrote:

quoted

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@infradead.org>
---
 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.

The below delta seems to build arm-allnoconfig, arm-defconfig and
arm-allmodconfig.

Although please don't ask me how asm/thread_info.h includes asm/percpu.h

Does that work for you?

Yes, thanks! I can't believe you removed the helpful comment.

-/*
- * how to get the current stack pointer in C
- */

Will