Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1267466

Re: [PATCH] mmc: change to use kmalloc

Show all headers | View raw

On Wed, Nov 11, 2015 at 11:17 PM, Peter Hurley <peter@hurleysoftware.com> wrote:
> On 11/11/2015 12:02 PM, Alim Akhtar wrote:
>> Hi Yalin,
>>
>> On Wed, Nov 11, 2015 at 9:53 AM, yalin wang <yalin.wang2010@gmail.com> wrote:
>>> Use kmalloc instead of kzalloc, zero the memory is not needed.
>>>
>> why you want to do this? what problem you faces, and how this resolves the same?
>
> The patch fixes an inefficiency: explicitly zeroing memory that is then
> immediately overwritten 6 lines below is wasteful.

It might fix previous kzalloc as well, though better not to do since
it's error prone.

>
> Regards,
> Peter Hurley
>
>>> Signed-off-by: yalin wang <yalin.wang2010@gmail.com>
>>> ---
>>>  drivers/mmc/card/block.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>>> index 23b6c8e..975cd3e 100644
>>> --- a/drivers/mmc/card/block.c
>>> +++ b/drivers/mmc/card/block.c
>>> @@ -365,7 +365,7 @@ static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
>>>         if (!idata->buf_bytes)
>>>                 return idata;
>>>
>>> -       idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
>>> +       idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
>>>         if (!idata->buf) {
>>>                 err = -ENOMEM;
>>>                 goto idata_err;
>>> --
>>> 1.9.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/



-- 
With Best Regards,
Andy Shevchenko
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH] mmc: change to use kmalloc yalin wang <yalin.wang2010@gmail.com> - 2015-11-11 05:30 +0100
  Re: [PATCH] mmc: change to use kmalloc Alim Akhtar <alim.akhtar@gmail.com> - 2015-11-11 18:10 +0100
    Re: [PATCH] mmc: change to use kmalloc Peter Hurley <peter@hurleysoftware.com> - 2015-11-11 22:20 +0100
      Re: [PATCH] mmc: change to use kmalloc Andy Shevchenko <andy.shevchenko@gmail.com> - 2015-11-11 23:00 +0100
        Re: [PATCH] mmc: change to use kmalloc yalin wang <yalin.wang2010@gmail.com> - 2015-11-12 12:30 +0100

csiph-web