Re: drivers/net/ethernet/freescale/ucc_geth.c:2454:64: sparse: sparse: incorrect type in argument 1 (different address spaces)

Fri, 08 Nov 2024 02:30:16 -0800 



Le 08/11/2024 à 09:18, Linus Walleij a écrit :

On Wed, Oct 30, 2024 at 8:05 AM kernel test robot <[email protected]> wrote:


tree:   
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kernel.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C5a1ff6cef1f642fba00a08dcffce0903%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638666507603442752%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=2dgpku3%2BPjovwZxpedYowAAB%2BR%2FeyxOc0Ys3kE0KK6E%3D&reserved=0
 master
head:   c1e939a21eb111a6d6067b38e8e04b8809b64c4e
commit: b28d1ccf921a4333be14017d82066386d419e638 powerpc/io: Expect immutable 
pointer in virt_to_phys() prototype


Ugh Stanislav do you have ideas around this one?


    drivers/net/ethernet/freescale/ucc_geth.c:244:21: sparse:     got 
restricted __be32 [noderef] __iomem *
    drivers/net/ethernet/freescale/ucc_geth.c:405:22: sparse: sparse: incorrect 
type in argument 1 (different base types) @@     expected unsigned short 
volatile [noderef] [usertype] __iomem *addr @@     got restricted __be16 
[noderef] [usertype] __iomem * @@


They all look the same, it's from this:

static void set_mac_addr(__be16 __iomem *reg, u8 *mac)
{
     out_be16(&reg[0], ((u16)mac[5] << 8) | mac[4]);
     out_be16(&reg[1], ((u16)mac[3] << 8) | mac[2]);
     out_be16(&reg[2], ((u16)mac[1] << 8) | mac[0]);
}

Is it simply that we need a paranthesis extra around the thing casted
to (u16) else it becomes u32?


Not at all. The one you point here are:


drivers/net/ethernet/freescale/ucc_geth.c:405:22: warning: incorrect 
type in argument 1 (different base types)
drivers/net/ethernet/freescale/ucc_geth.c:405:22:    expected unsigned 
short volatile [noderef] [usertype] __iomem *addr
drivers/net/ethernet/freescale/ucc_geth.c:405:22:    got restricted 
__be16 [noderef] [usertype] __iomem *
drivers/net/ethernet/freescale/ucc_geth.c:406:22: warning: incorrect 
type in argument 1 (different base types)
drivers/net/ethernet/freescale/ucc_geth.c:406:22:    expected unsigned 
short volatile [noderef] [usertype] __iomem *addr
drivers/net/ethernet/freescale/ucc_geth.c:406:22:    got restricted 
__be16 [noderef] [usertype] __iomem *
drivers/net/ethernet/freescale/ucc_geth.c:407:22: warning: incorrect 
type in argument 1 (different base types)
drivers/net/ethernet/freescale/ucc_geth.c:407:22:    expected unsigned 
short volatile [noderef] [usertype] __iomem *addr
drivers/net/ethernet/freescale/ucc_geth.c:407:22:    got restricted 
__be16 [noderef] [usertype] __iomem *
drivers/net/ethernet/freescale/ucc_geth.c:449:23: warning: incorrect 
type in argument 1 (different base types)
drivers/net/ethernet/freescale/ucc_geth.c:449:23:    expected restricted 
__be16 [noderef] [usertype] __iomem *reg
drivers/net/ethernet/freescale/ucc_geth.c:449:23:    got unsigned short 
[noderef] __iomem *


The problem is the __be16 in the function prototype.

        set_mac_addr(&p_82xx_addr_filt->taddr.h, p_enet_addr);

p_82xx_addr_filt->taddr.h is a u16
and out_be16() expects a u16*

So the following fixes the above warnings:


diff --git a/drivers/net/ethernet/freescale/ucc_geth.c 
b/drivers/net/ethernet/freescale/ucc_geth.c

index ab421243a419..bbfc289dd73c 100644
--- a/drivers/net/ethernet/freescale/ucc_geth.c
+++ b/drivers/net/ethernet/freescale/ucc_geth.c

@@ -400,7 +400,7 @@ static void put_enet_addr_container(struct 
enet_addr_container *enet_addr_cont)

        kfree(enet_addr_cont);
 }

-static void set_mac_addr(__be16 __iomem *reg, u8 *mac)
+static void set_mac_addr(u16 __iomem *reg, u8 *mac)
 {
        out_be16(&reg[0], ((u16)mac[5] << 8) | mac[4]);
        out_be16(&reg[1], ((u16)mac[3] << 8) | mac[2]);




For the other ones, most of them are because out_beXX() expects uXX* not 
__beXX *.



It looks like the warnings go away if you replace out_be32() by 
iowrite32be(), which has been possible since commit 894fa235eb4c 
("powerpc: inline iomap accessors") (out_beXX/in_beXX should anyway not 
be used outside arch/powerpc/):



diff --git a/drivers/net/ethernet/freescale/ucc_geth.c 
b/drivers/net/ethernet/freescale/ucc_geth.c

index ab421243a419..625b58b3efc8 100644
--- a/drivers/net/ethernet/freescale/ucc_geth.c
+++ b/drivers/net/ethernet/freescale/ucc_geth.c

@@ -241,12 +241,12 @@ static struct sk_buff *get_new_skb(struct 
ucc_geth_private *ugeth,

                    (((unsigned)skb->data) & (UCC_GETH_RX_DATA_BUF_ALIGNMENT -
                                              1)));

-       out_be32(&((struct qe_bd __iomem *)bd)->buf,
+       iowrite32be(
                      dma_map_single(ugeth->dev,
                                     skb->data,
                                     ugeth->ug_info->uf_info.max_rx_buf_length +
                                     UCC_GETH_RX_DATA_BUF_ALIGNMENT,
-                                    DMA_FROM_DEVICE));
+                                    DMA_FROM_DEVICE), &((struct qe_bd __iomem 
*)bd)->buf);

        out_be32((u32 __iomem *)bd,
                        (R_E | R_I | (in_be32((u32 __iomem*)bd) & R_W)));


Christophe























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