linux-kernel - [PATCH v2 2/4] net: i825xx: Use absolute_pointer for memcpy from fixed memory location

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Message-Id: <20210915035227.630204-3-linux@roeck-us.net>
Date:   Tue, 14 Sep 2021 20:52:25 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-alpha@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org,
        netdev@...r.kernel.org, linux-sparse@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH v2 2/4] net: i825xx: Use absolute_pointer for memcpy from fixed memory location

gcc 11.x reports the following compiler warning/error.

drivers/net/ethernet/i825xx/82596.c: In function 'i82596_probe':
    ./arch/m68k/include/asm/string.h:72:25: error:
            '__builtin_memcpy' reading 6 bytes from a region of size 0
                    [-Werror=stringop-overread]

Use absolute_pointer() to work around the problem.

Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
v2: No change

 drivers/net/ethernet/i825xx/82596.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/i825xx/82596.c b/drivers/net/ethernet/i825xx/82596.c
index b8a40146b895..b482f6f633bd 100644
--- a/drivers/net/ethernet/i825xx/82596.c
+++ b/drivers/net/ethernet/i825xx/82596.c
@@ -1144,7 +1144,7 @@ static struct net_device * __init i82596_probe(void)
 			err = -ENODEV;
 			goto out;
 		}
-		memcpy(eth_addr, (void *) 0xfffc1f2c, ETH_ALEN);	/* YUCK! Get addr from NOVRAM */
+		memcpy(eth_addr, absolute_pointer(0xfffc1f2c), ETH_ALEN); /* YUCK! Get addr from NOVRAM */
 		dev->base_addr = MVME_I596_BASE;
 		dev->irq = (unsigned) MVME16x_IRQ_I596;
 		goto found;
-- 
2.33.0