linux-kernel - Re: [PATCH] net: ethernet: xilinx: Mark XILINX_LL

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Date:   Wed, 29 Nov 2017 09:44:10 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     geert+renesas@...der.be
Cc:     michal.simek@...inx.com, arnd@...db.de, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ethernet: xilinx: Mark XILINX_LL_TEMAC broken on
 64-bit

From: Geert Uytterhoeven <geert+renesas@...der.be>
Date: Wed, 29 Nov 2017 11:01:09 +0100

> On 64-bit (e.g. powerpc64/allmodconfig):
> 
>     drivers/net/ethernet/xilinx/ll_temac_main.c: In function 'temac_start_xmit_done':
>     drivers/net/ethernet/xilinx/ll_temac_main.c:633:22: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
> 	dev_kfree_skb_irq((struct sk_buff *)cur_p->app4);
> 			  ^
> 
> cdmac_bd.app4 is u32, so it is too small to hold a kernel pointer.
> 
> Note that several other fields in struct cdmac_bd are also too small to
> hold physical addresses on 64-bit platforms.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>

Yeah, I can't see much value in implementing a hash table converting between
32-bit cookies and 64-bit points just for this if it'll never be actually
used.

Applied, thanks Geert.