[ltt-dev] lttv unable to execute textDump on MIPS multicore target

[Mathieu Desnoyers]

* David Daney (ddaney at caviumnetworks.com) wrote:
> On 02/14/2011 11:43 AM, Mathieu Desnoyers wrote:
>
>> Index: linux-2.6-lttng/arch/mips/include/asm/timex.h
>> ===================================================================
>> --- linux-2.6-lttng.orig/arch/mips/include/asm/timex.h
>> +++ linux-2.6-lttng/arch/mips/include/asm/timex.h
>> @@ -42,9 +42,32 @@ extern unsigned int mips_hpt_frequency;
>>    * will result in the timer interrupt getting lost.
>>    */
>>
>> +#ifdef CONFIG_HAVE_GET_CYCLES
>> +typedef unsigned int cycles_t;
>> +
>> +static inline cycles_t get_cycles(void)
>> +{
>> +	return read_c0_cvmcount();
>> +}
>
>
> c0_cvmcount is not a standard register.  It is an implementation defined  
> extension to mips64r2, therefore its use should be gated by:
>
> #ifdef CONFIG_CPU_CAVIUM_OCTEON

It actually is, thanks to the following Kconfig dep:

+config HAVE_GET_CYCLES
+       def_bool y
+       depends on CPU_CAVIUM_OCTEON
[...]

But maybe is that a bit misleading for the future ?

Thanks,

Mathieu


>
> David Daney
>

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com