From: Christian Borntraeger
Sent: Tuesday, July 24, 2018 7:16 PM
> >> So you are trading of a load + add (dev_info->start should be cache hot)
> >> against a
> >> compare+branch . Not sure that this is always a win.
> >
> > Hmm...the calculation process of pfn is more complicated than kaddr. I
On 07/24/2018 11:46 AM, Huaisheng HS1 Ye wrote:
> From: Christian Borntraeger
> Sent: Tuesday, July 24, 2018 4:54 PM
>> On 07/24/2018 10:45 AM, Huaisheng Ye wrote:
>>> From: Huaisheng Ye
>>>
>>> dcssblk_direct_access() needs to check the validity of second rank
>>> pointer kaddr for NULL
From: Christian Borntraeger
Sent: Tuesday, July 24, 2018 4:54 PM
> On 07/24/2018 10:45 AM, Huaisheng Ye wrote:
> > From: Huaisheng Ye
> >
> > dcssblk_direct_access() needs to check the validity of second rank
> > pointer kaddr for NULL assignment. If kaddr equals to NULL, it
> > doesn't need to
On 07/24/2018 10:45 AM, Huaisheng Ye wrote:
> From: Huaisheng Ye
>
> dcssblk_direct_access() needs to check the validity of second rank
> pointer kaddr for NULL assignment. If kaddr equals to NULL, it
> doesn't need to calculate the value.
>
> Signed-off-by: Huaisheng Ye
> ---
>
From: Huaisheng Ye
dcssblk_direct_access() needs to check the validity of second rank
pointer kaddr for NULL assignment. If kaddr equals to NULL, it
doesn't need to calculate the value.
Signed-off-by: Huaisheng Ye
---
drivers/s390/block/dcssblk.c | 3 ++-
1 file changed, 2 insertions(+), 1
