[PATCH 5.4 09/92] staging/octeon: Use stubs for MIPS && !CAVIUM_OCTEON_SOC

[Greg Kroah-Hartman]

From: Paul Burton <paul.burton@xxxxxxxx>

commit 17a29fea086ba18b000d28439bd5cb4f2b0a527b upstream.

When building for a non-Cavium MIPS system with COMPILE_TEST=y, the
Octeon ethernet driver hits a number of issues due to use of macros
provided only for CONFIG_CAVIUM_OCTEON_SOC=y configurations. For
example:

  drivers/staging/octeon/ethernet-rx.c:190:6: error:
    'CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE' undeclared (first use in this function)
  drivers/staging/octeon/ethernet-rx.c:472:25: error:
    'OCTEON_IRQ_WORKQ0' undeclared (first use in this function)

These come from various asm/ headers that a non-Octeon build will be
using a non-Octeon version of.

Fix this by using the octeon-stubs.h header for non-Cavium MIPS builds,
and only using the real asm/octeon/ headers when building a Cavium
Octeon kernel configuration.

This requires that octeon-stubs.h doesn't redefine XKPHYS_TO_PHYS, which
is defined for MIPS by asm/addrspace.h which is pulled in by many other
common asm/ headers.

Signed-off-by: Paul Burton <paul.burton@xxxxxxxx>
Reported-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
URL: https://lore.kernel.org/linux-mips/CAMuHMdXvu+BppwzsU9imNWVKea_hoLcRt9N+a29Q-QsjW=ip2g@xxxxxxxxxxxxxx/
Fixes: 171a9bae68c7 ("staging/octeon: Allow test build on !MIPS")
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20191007231741.2012860-1-paul.burton@xxxxxxxx
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/staging/octeon/octeon-ethernet.h |    2 +-
 drivers/staging/octeon/octeon-stubs.h    |    5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/staging/octeon/octeon-ethernet.h
+++ b/drivers/staging/octeon/octeon-ethernet.h
@@ -14,7 +14,7 @@
 #include <linux/of.h>
 #include <linux/phy.h>
 
-#ifdef CONFIG_MIPS
+#ifdef CONFIG_CAVIUM_OCTEON_SOC
 
 #include <asm/octeon/octeon.h>
 
--- a/drivers/staging/octeon/octeon-stubs.h
+++ b/drivers/staging/octeon/octeon-stubs.h
@@ -1,5 +1,8 @@
 #define CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE	512
-#define XKPHYS_TO_PHYS(p)			(p)
+
+#ifndef XKPHYS_TO_PHYS
+# define XKPHYS_TO_PHYS(p)			(p)
+#endif
 
 #define OCTEON_IRQ_WORKQ0 0
 #define OCTEON_IRQ_RML 0