On Wednesday, July 13, 2016 11:41:50 AM CEST Jason Baron wrote:
>
> Hi Arnd,
>
> Ok, this is back in linux-next now (with hopefully a fix for arm). I
> was never able to quite reproduce the arm failure you saw. So if
> you get the chance to test this it would be great.
>
I've had a day's worth of randconfig tests without running into the problem
so far.
However, I did get one new compiler warning that I have just bisected
down to 21413cd0e4ed ("dynamic_debug: add jump label support"):
/git/arm-soc/drivers/media/dvb-frontends/cxd2841er.c: In function
'cxd2841er_tune_tc':
/git/arm-soc/drivers/media/dvb-frontends/cxd2841er.c:3253:40: error:
'carrier_offset' may be used uninitialized in this function
[-Werror=maybe-uninitialized]
if (ret)
^
return ret;
~~~~~~~~~
/git/arm-soc/drivers/media/dvb-frontends/cxd2841er.c:3209:11: note:
'carrier_offset' was declared here
int ret, carrier_offset;
^~~~~~~~~~~~~~
It's clearly a false positive warning, the code is correct, but if this is
the only one that the dynamic_debug jump labels introduce, we may as well
just work around it in the driver.
I think this is caused by the "unlikely" annotation in dynamic_dev_dbg(),
which confuses the compiler trying to figure out whether the variable
is initialized or not.
Arnd
