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    ipg.c doesn't compile with with CONFIG_HIGHMEM64G · 1dad939d
    trem 提交于
    I've tried to compile 2.6.23-rc8-mm2, but it fails on ipg.c with the
    error : ERROR: "__udivdi3" [drivers/net/ipg.ko] undefined!
    
    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.
    
    [akpm@linux-foundation.org: cleanups]
    Cc: Sorbica Shieh <sorbica@icplus.com.tw>
    Cc: Jesse Huang <jesse@icplus.com.tw>
    Cc: Jeff Garzik <jeff@garzik.org>
    Cc: "David S. Miller" <davem@davemloft.net>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NJeff Garzik <jeff@garzik.org>
    1dad939d
ipg.c 60.6 KB