powerpc: fix circular dependency in percpu.h

[Willy Tarreau]

After random.h started to include percpu.h (commit f227e3e), several
archs broke in circular dependencies around percpu.h.

In https://lore.kernel.org/lkml/20200802204842.36bca162@xxxxxxxxxxxxxxxx/
Stephen Rothwell reported breakage for powerpc with CONFIG_PPC_FSL_BOOK3E.

It turns out that asm/percpu.h includes asm/paca.h, which itself
includes mmu.h, which includes percpu.h when CONFIG_PPC_FSL_BOOK3E=y.

Percpu seems to include asm/paca.h only for local_paca which is used in
the __my_cpu_offset macro. Removing this include solves the issue for
this config.

Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Fixes: f227e3e ("random32: update the net random state on interrupt and activity")
Link: https://lore.kernel.org/lkml/20200802204842.36bca162@xxxxxxxxxxxxxxxx/
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Signed-off-by: Willy Tarreau <w@xxxxxx>
---
 arch/powerpc/include/asm/percpu.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/powerpc/include/asm/percpu.h b/arch/powerpc/include/asm/percpu.h
index dce863a..cd3f6e5 100644
--- a/arch/powerpc/include/asm/percpu.h
+++ b/arch/powerpc/include/asm/percpu.h
@@ -10,8 +10,6 @@
 
 #ifdef CONFIG_SMP
 
-#include <asm/paca.h>
-
 #define __my_cpu_offset local_paca->data_offset
 
 #endif /* CONFIG_SMP */
-- 
2.9.0


--+QahgC5+KEYLbs62--