linux-kernel - Re: 2.6.23-rc6-mm1 -- ipg.c don't compile on i386 with CONFIG

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Message-ID: <fd5skp$ctk$1@sea.gmane.org>
Date:	Sun, 23 Sep 2007 16:19:05 +0200
From:	trem <tremyfr@...oo.fr>
To:	linux-kernel@...r.kernel.org
Subject:  Re: 2.6.23-rc6-mm1 -- ipg.c don't compile on i386 with CONFIG_HIGHMEM64G

Hi

I've tried to compile 2.6.23-rc6-mm1, but it fails on ipg.c with the error :
Setup is 10964 bytes (padded to 11264 bytes).
System is 1640 kB
Kernel: arch/i386/boot/bzImage is ready  (#1)
  Building modules, stage 2.
  MODPOST 2030 modules
WARNING: Can't handle masks in drivers/mtd/nand/cafe_nand:FFFF0
ERROR: "__udivdi3" [drivers/net/ipg.ko] undefined!
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2
error: Bad exit status from /home/trem/rpm/tmp/rpm-tmp.23895 (%build)

I've instigated a bit, and I've found this code in ipg.c :

static void ipg_nic_txfree(struct net_device *dev)
{
       struct ipg_nic_private *sp = netdev_priv(dev);
       void __iomem *ioaddr = sp->ioaddr;
       const unsigned int curr = ipg_r32(TFD_LIST_PTR_0) -
               (sp->txd_map / sizeof(struct ipg_tx)) - 1;
       unsigned int released, pending;



sp->txd_map is an u64
because :
	dma_addr_t txd_map;

And in asm-i386/types.h, I see :
#ifdef CONFIG_HIGHMEM64G
typedef u64 dma_addr_t;
#else
typedef u32 dma_addr_t;
#endif
I my config, I use CONFIG_HIGHMEM64G

sizeof(struct ipg_tx) is an u32
So the div failed on i386 because of u64 / u32.

I propose the following patch :

--- linux-2.6.22.old/drivers/net/ipg.c  2007-09-21 20:28:57.000000000 -0400
+++ linux-2.6.22.new/drivers/net/ipg.c  2007-09-21 20:22:15.000000000 -0400
@@ -837,7 +837,7 @@ static void ipg_nic_txfree(struct net_de
        struct ipg_nic_private *sp = netdev_priv(dev);
        void __iomem *ioaddr = sp->ioaddr;
        const unsigned int curr = ipg_r32(TFD_LIST_PTR_0) -
-               (sp->txd_map / sizeof(struct ipg_tx)) - 1;
+               do_div(sp->txd_map , sizeof(struct ipg_tx)) - 1;
        unsigned int released, pending;

        IPG_DEBUG_MSG("_nic_txfree\n");


With this patch, it compiles on i386 and x86_64, but I haven't tested if
this network card works (I don't have it).


regards,
trem

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