Re: [PATCH] drm/via: use get_user_pages_unlocked()

[Daniel Vetter]

On Mon, Feb 20, 2017 at 06:46:54PM +, Lorenzo Stoakes wrote:
> On 6 January 2017 at 07:09, Lorenzo Stoakes  wrote:
> >
> > Adding Andrew, as this may be another less active corner of the corner, 
> > thanks!
> 
> Hi all,
> 
> Thought I'd also give this one a gentle nudge now the merge window has
> re-opened, Andrew - are you ok to pick this up? I've checked the patch
> and it still applies, for convenience the raw patch is available at
> https://marc.info/?l=linux-mm=147802942832515=raw - let me know if
> there's anything else I can do on this or if you'd prefer a re-send.

Somehow your original patch never made it to dri-devel :( The via driver
is entirely unmaintained, but if you resubmit I'll smash it into drm-misc
for 4.12. Merge window is long over already for 4.11, subsystems need to
have their stuff ready _before_ it starts.

Cheers, Daniel
> 
> Best, Lorenzo
> 
> > On 3 January 2017 at 20:23, Lorenzo Stoakes  wrote:
> >> Hi All,
> >>
> >> Just a gentle ping on this one :)
> >>
> >> Cheers, Lorenzo
> >>
> >> On 1 November 2016 at 19:43, Lorenzo Stoakes  wrote:
> >>> Moving from get_user_pages() to get_user_pages_unlocked() simplifies the 
> >>> code
> >>> and takes advantage of VM_FAULT_RETRY functionality when faulting in 
> >>> pages.
> >>>
> >>> Signed-off-by: Lorenzo Stoakes 
> >>> ---
> >>>  drivers/gpu/drm/via/via_dmablit.c | 10 +++---
> >>>  1 file changed, 3 insertions(+), 7 deletions(-)
> >>>
> >>> diff --git a/drivers/gpu/drm/via/via_dmablit.c 
> >>> b/drivers/gpu/drm/via/via_dmablit.c
> >>> index 1a3ad76..98aae98 100644
> >>> --- a/drivers/gpu/drm/via/via_dmablit.c
> >>> +++ b/drivers/gpu/drm/via/via_dmablit.c
> >>> @@ -238,13 +238,9 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  
> >>> drm_via_dmablit_t *xfer)
> >>> vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages);
> >>> if (NULL == vsg->pages)
> >>> return -ENOMEM;
> >>> -   down_read(>mm->mmap_sem);
> >>> -   ret = get_user_pages((unsigned long)xfer->mem_addr,
> >>> -vsg->num_pages,
> >>> -(vsg->direction == DMA_FROM_DEVICE) ? 
> >>> FOLL_WRITE : 0,
> >>> -vsg->pages, NULL);
> >>> -
> >>> -   up_read(>mm->mmap_sem);
> >>> +   ret = get_user_pages_unlocked((unsigned long)xfer->mem_addr,
> >>> +   vsg->num_pages, vsg->pages,
> >>> +   (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE 
> >>> : 0);
> >>> if (ret != vsg->num_pages) {
> >>> if (ret < 0)
> >>> return ret;
> >>> --
> >>> 2.10.2
> >>>
> 
> -- 
> Lorenzo Stoakes
> https://ljs.io
> 
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majord...@kvack.org.  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: mailto:"d...@kvack.org;> em...@kvack.org 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH] drm/via: use get_user_pages_unlocked()

[Daniel Vetter]

On Mon, Feb 20, 2017 at 06:46:54PM +, Lorenzo Stoakes wrote:
> On 6 January 2017 at 07:09, Lorenzo Stoakes  wrote:
> >
> > Adding Andrew, as this may be another less active corner of the corner, 
> > thanks!
> 
> Hi all,
> 
> Thought I'd also give this one a gentle nudge now the merge window has
> re-opened, Andrew - are you ok to pick this up? I've checked the patch
> and it still applies, for convenience the raw patch is available at
> https://marc.info/?l=linux-mm=147802942832515=raw - let me know if
> there's anything else I can do on this or if you'd prefer a re-send.

Somehow your original patch never made it to dri-devel :( The via driver
is entirely unmaintained, but if you resubmit I'll smash it into drm-misc
for 4.12. Merge window is long over already for 4.11, subsystems need to
have their stuff ready _before_ it starts.

Cheers, Daniel
> 
> Best, Lorenzo
> 
> > On 3 January 2017 at 20:23, Lorenzo Stoakes  wrote:
> >> Hi All,
> >>
> >> Just a gentle ping on this one :)
> >>
> >> Cheers, Lorenzo
> >>
> >> On 1 November 2016 at 19:43, Lorenzo Stoakes  wrote:
> >>> Moving from get_user_pages() to get_user_pages_unlocked() simplifies the 
> >>> code
> >>> and takes advantage of VM_FAULT_RETRY functionality when faulting in 
> >>> pages.
> >>>
> >>> Signed-off-by: Lorenzo Stoakes 
> >>> ---
> >>>  drivers/gpu/drm/via/via_dmablit.c | 10 +++---
> >>>  1 file changed, 3 insertions(+), 7 deletions(-)
> >>>
> >>> diff --git a/drivers/gpu/drm/via/via_dmablit.c 
> >>> b/drivers/gpu/drm/via/via_dmablit.c
> >>> index 1a3ad76..98aae98 100644
> >>> --- a/drivers/gpu/drm/via/via_dmablit.c
> >>> +++ b/drivers/gpu/drm/via/via_dmablit.c
> >>> @@ -238,13 +238,9 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  
> >>> drm_via_dmablit_t *xfer)
> >>> vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages);
> >>> if (NULL == vsg->pages)
> >>> return -ENOMEM;
> >>> -   down_read(>mm->mmap_sem);
> >>> -   ret = get_user_pages((unsigned long)xfer->mem_addr,
> >>> -vsg->num_pages,
> >>> -(vsg->direction == DMA_FROM_DEVICE) ? 
> >>> FOLL_WRITE : 0,
> >>> -vsg->pages, NULL);
> >>> -
> >>> -   up_read(>mm->mmap_sem);
> >>> +   ret = get_user_pages_unlocked((unsigned long)xfer->mem_addr,
> >>> +   vsg->num_pages, vsg->pages,
> >>> +   (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE 
> >>> : 0);
> >>> if (ret != vsg->num_pages) {
> >>> if (ret < 0)
> >>> return ret;
> >>> --
> >>> 2.10.2
> >>>
> 
> -- 
> Lorenzo Stoakes
> https://ljs.io
> 
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majord...@kvack.org.  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: mailto:"d...@kvack.org;> em...@kvack.org 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH] drm/via: use get_user_pages_unlocked()

[Lorenzo Stoakes]

On 6 January 2017 at 07:09, Lorenzo Stoakes  wrote:
>
> Adding Andrew, as this may be another less active corner of the corner, 
> thanks!

Hi all,

Thought I'd also give this one a gentle nudge now the merge window has
re-opened, Andrew - are you ok to pick this up? I've checked the patch
and it still applies, for convenience the raw patch is available at
https://marc.info/?l=linux-mm=147802942832515=raw - let me know if
there's anything else I can do on this or if you'd prefer a re-send.

Best, Lorenzo

> On 3 January 2017 at 20:23, Lorenzo Stoakes  wrote:
>> Hi All,
>>
>> Just a gentle ping on this one :)
>>
>> Cheers, Lorenzo
>>
>> On 1 November 2016 at 19:43, Lorenzo Stoakes  wrote:
>>> Moving from get_user_pages() to get_user_pages_unlocked() simplifies the 
>>> code
>>> and takes advantage of VM_FAULT_RETRY functionality when faulting in pages.
>>>
>>> Signed-off-by: Lorenzo Stoakes 
>>> ---
>>>  drivers/gpu/drm/via/via_dmablit.c | 10 +++---
>>>  1 file changed, 3 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/via/via_dmablit.c 
>>> b/drivers/gpu/drm/via/via_dmablit.c
>>> index 1a3ad76..98aae98 100644
>>> --- a/drivers/gpu/drm/via/via_dmablit.c
>>> +++ b/drivers/gpu/drm/via/via_dmablit.c
>>> @@ -238,13 +238,9 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  
>>> drm_via_dmablit_t *xfer)
>>> vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages);
>>> if (NULL == vsg->pages)
>>> return -ENOMEM;
>>> -   down_read(>mm->mmap_sem);
>>> -   ret = get_user_pages((unsigned long)xfer->mem_addr,
>>> -vsg->num_pages,
>>> -(vsg->direction == DMA_FROM_DEVICE) ? 
>>> FOLL_WRITE : 0,
>>> -vsg->pages, NULL);
>>> -
>>> -   up_read(>mm->mmap_sem);
>>> +   ret = get_user_pages_unlocked((unsigned long)xfer->mem_addr,
>>> +   vsg->num_pages, vsg->pages,
>>> +   (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 
>>> 0);
>>> if (ret != vsg->num_pages) {
>>> if (ret < 0)
>>> return ret;
>>> --
>>> 2.10.2
>>>

-- 
Lorenzo Stoakes
https://ljs.io

Re: [PATCH] drm/via: use get_user_pages_unlocked()

[Lorenzo Stoakes]

On 6 January 2017 at 07:09, Lorenzo Stoakes  wrote:
>
> Adding Andrew, as this may be another less active corner of the corner, 
> thanks!

Hi all,

Thought I'd also give this one a gentle nudge now the merge window has
re-opened, Andrew - are you ok to pick this up? I've checked the patch
and it still applies, for convenience the raw patch is available at
https://marc.info/?l=linux-mm=147802942832515=raw - let me know if
there's anything else I can do on this or if you'd prefer a re-send.

Best, Lorenzo

> On 3 January 2017 at 20:23, Lorenzo Stoakes  wrote:
>> Hi All,
>>
>> Just a gentle ping on this one :)
>>
>> Cheers, Lorenzo
>>
>> On 1 November 2016 at 19:43, Lorenzo Stoakes  wrote:
>>> Moving from get_user_pages() to get_user_pages_unlocked() simplifies the 
>>> code
>>> and takes advantage of VM_FAULT_RETRY functionality when faulting in pages.
>>>
>>> Signed-off-by: Lorenzo Stoakes 
>>> ---
>>>  drivers/gpu/drm/via/via_dmablit.c | 10 +++---
>>>  1 file changed, 3 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/via/via_dmablit.c 
>>> b/drivers/gpu/drm/via/via_dmablit.c
>>> index 1a3ad76..98aae98 100644
>>> --- a/drivers/gpu/drm/via/via_dmablit.c
>>> +++ b/drivers/gpu/drm/via/via_dmablit.c
>>> @@ -238,13 +238,9 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  
>>> drm_via_dmablit_t *xfer)
>>> vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages);
>>> if (NULL == vsg->pages)
>>> return -ENOMEM;
>>> -   down_read(>mm->mmap_sem);
>>> -   ret = get_user_pages((unsigned long)xfer->mem_addr,
>>> -vsg->num_pages,
>>> -(vsg->direction == DMA_FROM_DEVICE) ? 
>>> FOLL_WRITE : 0,
>>> -vsg->pages, NULL);
>>> -
>>> -   up_read(>mm->mmap_sem);
>>> +   ret = get_user_pages_unlocked((unsigned long)xfer->mem_addr,
>>> +   vsg->num_pages, vsg->pages,
>>> +   (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 
>>> 0);
>>> if (ret != vsg->num_pages) {
>>> if (ret < 0)
>>> return ret;
>>> --
>>> 2.10.2
>>>

-- 
Lorenzo Stoakes
https://ljs.io

Re: [PATCH] drm/via: use get_user_pages_unlocked()

[Lorenzo Stoakes]

On 3 January 2017 at 20:23, Lorenzo Stoakes  wrote:
> Hi All,
>
> Just a gentle ping on this one :)
>
> Cheers, Lorenzo
>
> On 1 November 2016 at 19:43, Lorenzo Stoakes  wrote:
>> Moving from get_user_pages() to get_user_pages_unlocked() simplifies the code
>> and takes advantage of VM_FAULT_RETRY functionality when faulting in pages.
>>
>> Signed-off-by: Lorenzo Stoakes 
>> ---
>>  drivers/gpu/drm/via/via_dmablit.c | 10 +++---
>>  1 file changed, 3 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/via/via_dmablit.c 
>> b/drivers/gpu/drm/via/via_dmablit.c
>> index 1a3ad76..98aae98 100644
>> --- a/drivers/gpu/drm/via/via_dmablit.c
>> +++ b/drivers/gpu/drm/via/via_dmablit.c
>> @@ -238,13 +238,9 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  
>> drm_via_dmablit_t *xfer)
>> vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages);
>> if (NULL == vsg->pages)
>> return -ENOMEM;
>> -   down_read(>mm->mmap_sem);
>> -   ret = get_user_pages((unsigned long)xfer->mem_addr,
>> -vsg->num_pages,
>> -(vsg->direction == DMA_FROM_DEVICE) ? 
>> FOLL_WRITE : 0,
>> -vsg->pages, NULL);
>> -
>> -   up_read(>mm->mmap_sem);
>> +   ret = get_user_pages_unlocked((unsigned long)xfer->mem_addr,
>> +   vsg->num_pages, vsg->pages,
>> +   (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 
>> 0);
>> if (ret != vsg->num_pages) {
>> if (ret < 0)
>> return ret;
>> --
>> 2.10.2
>>

Adding Andrew, as this may be another less active corner of the corner, thanks!

-- 
Lorenzo Stoakes
https://ljs.io

Re: [PATCH] drm/via: use get_user_pages_unlocked()

[Lorenzo Stoakes]

On 3 January 2017 at 20:23, Lorenzo Stoakes  wrote:
> Hi All,
>
> Just a gentle ping on this one :)
>
> Cheers, Lorenzo
>
> On 1 November 2016 at 19:43, Lorenzo Stoakes  wrote:
>> Moving from get_user_pages() to get_user_pages_unlocked() simplifies the code
>> and takes advantage of VM_FAULT_RETRY functionality when faulting in pages.
>>
>> Signed-off-by: Lorenzo Stoakes 
>> ---
>>  drivers/gpu/drm/via/via_dmablit.c | 10 +++---
>>  1 file changed, 3 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/via/via_dmablit.c 
>> b/drivers/gpu/drm/via/via_dmablit.c
>> index 1a3ad76..98aae98 100644
>> --- a/drivers/gpu/drm/via/via_dmablit.c
>> +++ b/drivers/gpu/drm/via/via_dmablit.c
>> @@ -238,13 +238,9 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  
>> drm_via_dmablit_t *xfer)
>> vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages);
>> if (NULL == vsg->pages)
>> return -ENOMEM;
>> -   down_read(>mm->mmap_sem);
>> -   ret = get_user_pages((unsigned long)xfer->mem_addr,
>> -vsg->num_pages,
>> -(vsg->direction == DMA_FROM_DEVICE) ? 
>> FOLL_WRITE : 0,
>> -vsg->pages, NULL);
>> -
>> -   up_read(>mm->mmap_sem);
>> +   ret = get_user_pages_unlocked((unsigned long)xfer->mem_addr,
>> +   vsg->num_pages, vsg->pages,
>> +   (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 
>> 0);
>> if (ret != vsg->num_pages) {
>> if (ret < 0)
>> return ret;
>> --
>> 2.10.2
>>

Adding Andrew, as this may be another less active corner of the corner, thanks!

-- 
Lorenzo Stoakes
https://ljs.io

Re: [PATCH] drm/via: use get_user_pages_unlocked()

[Lorenzo Stoakes]

Hi All,

Just a gentle ping on this one :)

Cheers, Lorenzo

On 1 November 2016 at 19:43, Lorenzo Stoakes  wrote:
> Moving from get_user_pages() to get_user_pages_unlocked() simplifies the code
> and takes advantage of VM_FAULT_RETRY functionality when faulting in pages.
>
> Signed-off-by: Lorenzo Stoakes 
> ---
>  drivers/gpu/drm/via/via_dmablit.c | 10 +++---
>  1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/via/via_dmablit.c 
> b/drivers/gpu/drm/via/via_dmablit.c
> index 1a3ad76..98aae98 100644
> --- a/drivers/gpu/drm/via/via_dmablit.c
> +++ b/drivers/gpu/drm/via/via_dmablit.c
> @@ -238,13 +238,9 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  
> drm_via_dmablit_t *xfer)
> vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages);
> if (NULL == vsg->pages)
> return -ENOMEM;
> -   down_read(>mm->mmap_sem);
> -   ret = get_user_pages((unsigned long)xfer->mem_addr,
> -vsg->num_pages,
> -(vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE 
> : 0,
> -vsg->pages, NULL);
> -
> -   up_read(>mm->mmap_sem);
> +   ret = get_user_pages_unlocked((unsigned long)xfer->mem_addr,
> +   vsg->num_pages, vsg->pages,
> +   (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 0);
> if (ret != vsg->num_pages) {
> if (ret < 0)
> return ret;
> --
> 2.10.2
>



-- 
Lorenzo Stoakes
https://ljs.io

Re: [PATCH] drm/via: use get_user_pages_unlocked()

[Lorenzo Stoakes]

Hi All,

Just a gentle ping on this one :)

Cheers, Lorenzo

On 1 November 2016 at 19:43, Lorenzo Stoakes  wrote:
> Moving from get_user_pages() to get_user_pages_unlocked() simplifies the code
> and takes advantage of VM_FAULT_RETRY functionality when faulting in pages.
>
> Signed-off-by: Lorenzo Stoakes 
> ---
>  drivers/gpu/drm/via/via_dmablit.c | 10 +++---
>  1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/via/via_dmablit.c 
> b/drivers/gpu/drm/via/via_dmablit.c
> index 1a3ad76..98aae98 100644
> --- a/drivers/gpu/drm/via/via_dmablit.c
> +++ b/drivers/gpu/drm/via/via_dmablit.c
> @@ -238,13 +238,9 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  
> drm_via_dmablit_t *xfer)
> vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages);
> if (NULL == vsg->pages)
> return -ENOMEM;
> -   down_read(>mm->mmap_sem);
> -   ret = get_user_pages((unsigned long)xfer->mem_addr,
> -vsg->num_pages,
> -(vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE 
> : 0,
> -vsg->pages, NULL);
> -
> -   up_read(>mm->mmap_sem);
> +   ret = get_user_pages_unlocked((unsigned long)xfer->mem_addr,
> +   vsg->num_pages, vsg->pages,
> +   (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 0);
> if (ret != vsg->num_pages) {
> if (ret < 0)
> return ret;
> --
> 2.10.2
>



-- 
Lorenzo Stoakes
https://ljs.io

[PATCH] drm/via: use get_user_pages_unlocked()

[Lorenzo Stoakes]

Moving from get_user_pages() to get_user_pages_unlocked() simplifies the code
and takes advantage of VM_FAULT_RETRY functionality when faulting in pages.

Signed-off-by: Lorenzo Stoakes 
---
 drivers/gpu/drm/via/via_dmablit.c | 10 +++---
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/via/via_dmablit.c 
b/drivers/gpu/drm/via/via_dmablit.c
index 1a3ad76..98aae98 100644
--- a/drivers/gpu/drm/via/via_dmablit.c
+++ b/drivers/gpu/drm/via/via_dmablit.c
@@ -238,13 +238,9 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  
drm_via_dmablit_t *xfer)
vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages);
if (NULL == vsg->pages)
return -ENOMEM;
-   down_read(>mm->mmap_sem);
-   ret = get_user_pages((unsigned long)xfer->mem_addr,
-vsg->num_pages,
-(vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 
0,
-vsg->pages, NULL);
-
-   up_read(>mm->mmap_sem);
+   ret = get_user_pages_unlocked((unsigned long)xfer->mem_addr,
+   vsg->num_pages, vsg->pages,
+   (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 0);
if (ret != vsg->num_pages) {
if (ret < 0)
return ret;
-- 
2.10.2

[PATCH] drm/via: use get_user_pages_unlocked()

[Lorenzo Stoakes]

Moving from get_user_pages() to get_user_pages_unlocked() simplifies the code
and takes advantage of VM_FAULT_RETRY functionality when faulting in pages.

Signed-off-by: Lorenzo Stoakes 
---
 drivers/gpu/drm/via/via_dmablit.c | 10 +++---
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/via/via_dmablit.c 
b/drivers/gpu/drm/via/via_dmablit.c
index 1a3ad76..98aae98 100644
--- a/drivers/gpu/drm/via/via_dmablit.c
+++ b/drivers/gpu/drm/via/via_dmablit.c
@@ -238,13 +238,9 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg,  
drm_via_dmablit_t *xfer)
vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages);
if (NULL == vsg->pages)
return -ENOMEM;
-   down_read(>mm->mmap_sem);
-   ret = get_user_pages((unsigned long)xfer->mem_addr,
-vsg->num_pages,
-(vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 
0,
-vsg->pages, NULL);
-
-   up_read(>mm->mmap_sem);
+   ret = get_user_pages_unlocked((unsigned long)xfer->mem_addr,
+   vsg->num_pages, vsg->pages,
+   (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 0);
if (ret != vsg->num_pages) {
if (ret < 0)
return ret;
-- 
2.10.2