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

[Michael Neuling]

On Thu, 2018-09-27 at 17:58 -0300, Breno Leitao wrote:
> 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.

Sure.


> 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
>