Re: [Qemu-devel] [PATCHv2] Reducing stack frame size in stream_process_mem2s()

[Alistair Francis <alistair.francis@xilinx.com>]

On Tue, Oct 4, 2016 at 1:56 PM, Edgar E. Iglesias
<edgar.iglesias@gmail.com> wrote:
> On Tue, Oct 04, 2016 at 11:41:42PM +0530, rutu.shah.26@gmail.com wrote:
>> From: Rutuja Shah <rutu.shah.26@gmail.com>
>>
>> Hi,
>> This patch allocates memory for txbuf in struct Stream rather than the stack.
>> As a result, the stack frame size is reduced of stream_process_mem2s().
>
> Hi Rutuja,
>
> A nit-pick:
> The commit message is not meant to be a converstation-like message, so
> normally we don't include greetings.
> The expected format is to have an empty line between the message and
> the SoB line.
>
> Here's an example:
>
> Allocate memory for txbuf in struct Stream rather than on the stack.
> As a result, the stack frame size is reduced for stream_process_mem2s().
>
> Signed-off-by: Rutuja Shah <rutu.shah.26@gmail.com>
>
>
> Other than that, this looks good to me:
> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>

I agree with Edgar, just taking out the hi and adding a new line
should be enough.
That can probably be done when applying it?

Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>

Thanks,

Alistair

>
>
>> Signed-off-by: Rutuja Shah <rutu.shah.26@gmail.com>
>> ---
>>  hw/dma/xilinx_axidma.c | 8 ++++----
>>  1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/hw/dma/xilinx_axidma.c b/hw/dma/xilinx_axidma.c
>> index b135a5f..6065689 100644
>> --- a/hw/dma/xilinx_axidma.c
>> +++ b/hw/dma/xilinx_axidma.c
>> @@ -111,6 +111,7 @@ struct Stream {
>>      unsigned int complete_cnt;
>>      uint32_t regs[R_MAX];
>>      uint8_t app[20];
>> +    unsigned char txbuf[16 * 1024];
>>  };
>>
>>  struct XilinxAXIDMAStreamSlave {
>> @@ -256,7 +257,6 @@ static void stream_process_mem2s(struct Stream *s, StreamSlave *tx_data_dev,
>>                                   StreamSlave *tx_control_dev)
>>  {
>>      uint32_t prev_d;
>> -    unsigned char txbuf[16 * 1024];
>>      unsigned int txlen;
>>
>>      if (!stream_running(s) || stream_idle(s)) {
>> @@ -277,17 +277,17 @@ static void stream_process_mem2s(struct Stream *s, StreamSlave *tx_data_dev,
>>          }
>>
>>          txlen = s->desc.control & SDESC_CTRL_LEN_MASK;
>> -        if ((txlen + s->pos) > sizeof txbuf) {
>> +        if ((txlen + s->pos) > sizeof s->txbuf) {
>>              hw_error("%s: too small internal txbuf! %d\n", __func__,
>>                       txlen + s->pos);
>>          }
>>
>>          cpu_physical_memory_read(s->desc.buffer_address,
>> -                                 txbuf + s->pos, txlen);
>> +                                 s->txbuf + s->pos, txlen);
>>          s->pos += txlen;
>>
>>          if (stream_desc_eof(&s->desc)) {
>> -            stream_push(tx_data_dev, txbuf, s->pos);
>> +            stream_push(tx_data_dev, s->txbuf, s->pos);
>>              s->pos = 0;
>>              stream_complete(s);
>>          }
>> --
>> 1.9.1
>>
>