Re: [Qemu-devel] [PATCH v2] hw: net: cadence_gem: Fix build errors in DB_PRINT()

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 8/8/19 8:36 AM, Bin Meng wrote:
> On Thu, Aug 8, 2019 at 1:21 PM Philippe Mathieu-Daudé <philmd@redhat.com> wrote:
>>
>> Hi,
>>
>> On 8/8/19 6:44 AM, Bin Meng wrote:
>>> When CADENCE_GEM_ERR_DEBUG is turned on, there are several
>>> compilation errors in DB_PRINT(). Fix them.
>>>
>>> Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
>>>
>>> ---
>>>
>>> Changes in v2:
>>
>> Please don't reply to previous version, post as a new thread (it is
>> harder to notice your new versions in a emails threaded view).
>>
> 
> OK.
> 
>>> - use HWADDR_PRIx instead of TARGET_FMT_plx for consistency
>>> - use 'z' modifier to print sizeof(..)
>>>
>>>  hw/net/cadence_gem.c | 7 ++++---
>>>  1 file changed, 4 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c
>>> index d412085..b6ff2c1 100644
>>> --- a/hw/net/cadence_gem.c
>>> +++ b/hw/net/cadence_gem.c
>>> @@ -983,8 +983,9 @@ static ssize_t gem_receive(NetClientState *nc, const uint8_t *buf, size_t size)
>>>              return -1;
>>>          }
>>>
>>> -        DB_PRINT("copy %d bytes to 0x%x\n", MIN(bytes_to_copy, rxbufsize),
>>> -                rx_desc_get_buffer(s->rx_desc[q]));
>>> +        DB_PRINT("copy %d bytes to 0x%" HWADDR_PRIx "\n",
>>
>> rx_desc_get_buffer() returns a uint64_t, shouldn't you use a PRIx64
>> format here?
> 
> HWADDR_PRIx expands to PRIx64. I got your point that since it does not
> return hwaddr, so we should use PRIx64 directly. Correct?
> 
>>
>>> +                 MIN(bytes_to_copy, rxbufsize),
>>
>> Nitpick #1: since you are cleaning this file up, bytes_to_copy and
>> rxbufsize are both unsigned, so the first format should be %u instead of %d.
> 
> Sure, will do in v3.
> 
>>
>>> +                 rx_desc_get_buffer(s, s->rx_desc[q]));
>>>
>>>          /* Copy packet data to emulated DMA buffer */
>>>          address_space_write(&s->dma_as, rx_desc_get_buffer(s, s->rx_desc[q]) +
>>> @@ -1157,7 +1158,7 @@ static void gem_transmit(CadenceGEMState *s)
>>>              if (tx_desc_get_length(desc) > sizeof(tx_packet) -
>>>                                                 (p - tx_packet)) {
>>>                  DB_PRINT("TX descriptor @ 0x%x too large: size 0x%x space " \
>>> -                         "0x%x\n", (unsigned)packet_desc_addr,
>>> +                         "0x%zx\n", (unsigned)packet_desc_addr,
>>
>> Nitpick #2: packet_desc_addr is of type hwaddr, so removing the cast the
>> 1st format is HWADDR_PRIx, also removing the 2nd cast the 2nd format is
>> PRIx64.
> 
> packet_desc_addr() return unsigned, so %x should be OK.

'packet_desc_addr' is of type hwaddr,
'(unsigned)packet_desc_addr' is casted to type unsigned.

Anyhow I now remember I already reviewed this patch:
https://lists.gnu.org/archive/html/qemu-devel/2019-06/msg03263.html

>>
>> Then the 3rd format is now correct.
>>
>>>                           (unsigned)tx_desc_get_length(desc),
>>>                           sizeof(tx_packet) - (p - tx_packet));
>>>                  break;
>>>