[RFC PATCH 05/11] powerpc/tm: Function that updates the failure code

[Breno Leitao]

Hi Mikey,

On 09/17/2018 10:29 PM, Michael Neuling wrote:
> On Wed, 2018-09-12 at 16:40 -0300, Breno Leitao wrote:
>> Now the transaction reclaims happens very earlier in the trap handler, and
>> it is impossible to know precisely, at that early time, what should be set
>> as the failure cause for some specific cases, as, if the task will be
>> rescheduled, thus, the transaction abort case should be updated from
>> TM_CAUSE_MISC to TM_CAUSE_RESCHED, for example.
> 
> Please add comments to where this is used (in EXCEPTION_COMMON macro I think)
> that say this might happen.

Is it OK if I comment it in TM_KERNEL_ENTRY macro, since the failure cause
could be updated independently of the exception being execute, so, every call
to TM_KERNEL_ENTRY can have the cause overwritten.

I.e. it does not matter if  the exception is a systemcall or a page fault,
the failure cause will be updated if there is a process reschedule after the
exception/syscall is handled.

Thank you