netdev - [PATCH] net: smc91x: Fix m68k kernel compilation for ColdFire CPU

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Date: Thu,  9 May 2024 14:17:14 +0200
From: Thorsten Blum <thorsten.blum@...lux.com>
To: Nicolas Pitre <nico@...xnic.net>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
	Arnd Bergmann <arnd@...db.de>
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Thorsten Blum <thorsten.blum@...lux.com>
Subject: [PATCH] net: smc91x: Fix m68k kernel compilation for ColdFire CPU

Compiling the m68k kernel with support for the ColdFire CPU family fails
with the following error:

In file included from drivers/net/ethernet/smsc/smc91x.c:80:
drivers/net/ethernet/smsc/smc91x.c: In function ‘smc_reset’:
drivers/net/ethernet/smsc/smc91x.h:160:40: error: implicit declaration of function ‘_swapw’; did you mean ‘swap’? [-Werror=implicit-function-declaration]
  160 | #define SMC_outw(lp, v, a, r)   writew(_swapw(v), (a) + (r))
      |                                        ^~~~~~
drivers/net/ethernet/smsc/smc91x.h:904:25: note: in expansion of macro ‘SMC_outw’
  904 |                         SMC_outw(lp, x, ioaddr, BANK_SELECT);           \
      |                         ^~~~~~~~
drivers/net/ethernet/smsc/smc91x.c:250:9: note: in expansion of macro ‘SMC_SELECT_BANK’
  250 |         SMC_SELECT_BANK(lp, 2);
      |         ^~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

The function _swapw() was removed in commit d97cf70af097 ("m68k: use
asm-generic/io.h for non-MMU io access functions"), but is still used in
drivers/net/ethernet/smsc/smc91x.h.

Re-adding the previously deleted _swapw() function resolves the error.

Signed-off-by: Thorsten Blum <thorsten.blum@...lux.com>
---
 drivers/net/ethernet/smsc/smc91x.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/smsc/smc91x.h b/drivers/net/ethernet/smsc/smc91x.h
index 46eee747c699..e5d7f49915c6 100644
--- a/drivers/net/ethernet/smsc/smc91x.h
+++ b/drivers/net/ethernet/smsc/smc91x.h
@@ -156,6 +156,11 @@ static inline void mcf_outsw(void *a, unsigned char *p, int l)
 		writew(*wp++, a);
 }
 
+static inline unsigned short _swapw(volatile unsigned short v)
+{
+	return ((v << 8) | (v >> 8));
+}
+
 #define SMC_inw(a, r)		_swapw(readw((a) + (r)))
 #define SMC_outw(lp, v, a, r)	writew(_swapw(v), (a) + (r))
 #define SMC_insw(a, r, p, l)	mcf_insw(a + r, p, l)
-- 
2.45.0