[PATCH] sparc: Increase CPU_STRUCTURE_ALIGNMENT to 32

[Sebastian Huber]

On 2014-02-11 18:24, Gedare Bloom wrote:
> Does this change negatively affect the older sparc boards?

This attribute is used only for two global structures.  So the negative effect 
is a waste of 3 * 15 bytes in the worst case.

>
> On Tue, Feb 11, 2014 at 11:25 AM, Sebastian Huber
> <sebastian.huber at embedded-brains.de> wrote:
>> Recent LEON4 systems use a cache line size of 32 bytes.
>> ---
>>   cpukit/score/cpu/sparc/rtems/score/cpu.h |    2 +-
>>   1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/cpukit/score/cpu/sparc/rtems/score/cpu.h b/cpukit/score/cpu/sparc/rtems/score/cpu.h
>> index fe76fa5..17a9f54 100644
>> --- a/cpukit/score/cpu/sparc/rtems/score/cpu.h
>> +++ b/cpukit/score/cpu/sparc/rtems/score/cpu.h
>> @@ -211,7 +211,7 @@ extern "C" {
>>    * The SPARC does not appear to have particularly strict alignment
>>    * requirements.  This value was chosen to take advantages of caches.
>>    */
>> -#define CPU_STRUCTURE_ALIGNMENT          __attribute__ ((aligned (16)))
>> +#define CPU_STRUCTURE_ALIGNMENT          __attribute__ ((aligned (32)))
>>
>>   #define CPU_TIMESTAMP_USE_INT64_INLINE TRUE
>>
>> --
>> 1.7.7
>>
>> _______________________________________________
>> rtems-devel mailing list
>> rtems-devel at rtems.org
>> http://www.rtems.org/mailman/listinfo/rtems-devel


-- 
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