From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Michael Tretter <m.tretter@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 3/3] net: macb: fix compiler warning for 64 bit systems
Date: Thu, 15 Oct 2020 16:13:12 +0200 [thread overview]
Message-ID: <0ecaf0ca-f87e-be20-976d-7e4263ea792a@pengutronix.de> (raw)
In-Reply-To: <20201015140420.GA18981@pengutronix.de>
Hi,
On 10/15/20 4:04 PM, Michael Tretter wrote:
> On Thu, 15 Oct 2020 15:29:01 +0200, Ahmad Fatoum wrote:
>> On 10/15/20 3:20 PM, Michael Tretter wrote:
>>> On arm64 the compiler prints the following warning, when the macb driver
>>> is enabled:
>>>
>>> warning: cast from pointer to integer of different size
>>>
>>> Add the same explicit cast as implemented for all other dma addresses in
>>> the macb driver.
>>>
>>> Fixes: befd110b5922 ("net: macb: init multiple dummy TX queues")
>>
>> I don't think this qualifies as a fix. You just silence the compiler
>> warning you that your truncate the upper 32 bits of your buffer's
>> address. This works because your SDRAM's location in physical memory
>> is below 4G.
>
> Correct. Which is exactly the same as assumed by the entire driver...
Ye, I am commenting on your Fixes: line though :-)
>
> Michael
>
>>
>>> Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
>>> ---
>>> drivers/net/macb.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/macb.c b/drivers/net/macb.c
>>> index fa530cfe8e4c..188dbf2d8c15 100644
>>> --- a/drivers/net/macb.c
>>> +++ b/drivers/net/macb.c
>>> @@ -365,7 +365,7 @@ static int gmac_init_dummy_tx_queues(struct macb_device *macb)
>>> MACB_BIT(TX_LAST) | MACB_BIT(TX_USED);
>>>
>>> for (i = 1; i < num_queues; i++)
>>> - gem_writel_queue_TBQP(macb, &macb->gem_q1_descs[0], i - 1);
>>> + gem_writel_queue_TBQP(macb, (ulong)macb->gem_q1_descs, i - 1);
>>>
>>> return 0;
>>> }
>>>
>
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next prev parent reply other threads:[~2020-10-15 14:13 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-15 13:20 [PATCH 1/3] net: macb: reduce DEBUG output to make it more useful Michael Tretter
2020-10-15 13:20 ` [PATCH 2/3] net: macb: adjust clk_tx rate for link speed changes Michael Tretter
2020-10-15 13:20 ` [PATCH 3/3] net: macb: fix compiler warning for 64 bit systems Michael Tretter
2020-10-15 13:29 ` Ahmad Fatoum
2020-10-15 14:04 ` Michael Tretter
2020-10-15 14:13 ` Ahmad Fatoum [this message]
2020-10-19 8:10 ` Sascha Hauer
2020-10-19 8:02 ` [PATCH 1/3] net: macb: reduce DEBUG output to make it more useful Sascha Hauer
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