On Thu, Dec 01 2016, Michal Hocko wrote:
> I am not familiar with this code so I cannot really argue but a quick
> look at rmem_cma_setup doesn't suggest any speicific placing or
> anything...
early_cma parses âcmaâ command line argument which can specify where
exactly the default CMA area is
On Thu, Dec 01 2016, Michal Hocko wrote:
> Let's also CC Marek
>
> On Thu 01-12-16 08:43:40, Vlastimil Babka wrote:
>> On 12/01/2016 08:21 AM, Michal Hocko wrote:
>> > Forgot to CC Joonsoo. The email thread starts more or less here
>> > http://lkml.kernel.org/r/20161130092239.GD18437 at dhcp22.suse
ing against concurrency
> with alloc_contig_range.
>
> Signed-off-by: Laura Abbott
Acked-by: Michal Nazarewicz
Furthermore, since CMA regions are always MAX_ORDER-page or pageblock
(whichever is bigger) aligned, we could use two mutexes per CMA region:
one protecting the bitmap and the other one
> On 2014-02-12 17:33, Russell King - ARM Linux wrote:
>> What if we did these changes:
>>
>> struct page *dma_alloc_from_contiguous(struct device *dev, int count,
>> unsigned int align)
>> {
>> ...
>> mutex_lock(&cma_mutex);
>> ...
>> for (
Tomasz Stanislawski writes:
> I recommend to change the semantics for unlimited number of segments
> from 'value 0' to:
>
> #define DMA_SEGMENTS_COUNT_UNLIMITED ((unsigned long)INT_MAX)
>
> Using INT_MAX will allow using safe conversions between signed and
> unsigned integers.
LONG_MAX seems cle
Tomasz Stanislawski writes:
> I recommend to change the semantics for unlimited number of segments
> from 'value 0' to:
>
> #define DMA_SEGMENTS_COUNT_UNLIMITED ((unsigned long)INT_MAX)
>
> Using INT_MAX will allow using safe conversions between signed and
> unsigned integers.
LONG_MAX seems cle
On Tue, 03 Jan 2012 15:19:04 +0100, Gilad Ben-Yossef
wrote:
on_each_cpu() returns as its own return value the return value of
smp_call_function(). smp_call_function() in turn returns a hard
coded value of zero.
Some callers to on_each_cpu() waste cycles and bloat code space
by checking the ret
On Tue, 03 Jan 2012 15:19:04 +0100, Gilad Ben-Yossef
wrote:
> on_each_cpu() returns as its own return value the return value of
> smp_call_function(). smp_call_function() in turn returns a hard
> coded value of zero.
>
> Some callers to on_each_cpu() waste cycles and bloat code space
> by checkin
