Re: [GIT PULL] objtool fixes and updates

[Tiezhu Yang]

On 04/01/2025 12:15 PM, Josh Poimboeuf wrote:
> On Tue, Apr 01, 2025 at 10:05:41AM +0800, Tiezhu Yang wrote:
> > (2) I did not meet the following objtool warnings before this merge
> > window:
> >
> > arch/loongarch/kernel/traps.o: warning: objtool: show_stack+0xe0: stack
> > state mismatch: reg1[22]=-1+0 reg2[22]=-2-160
> > arch/loongarch/kernel/traps.o: warning: objtool: show_stack+0xe0: stack
> > state mismatch: reg1[23]=-1+0 reg2[23]=-2-152
> >
> > and I did not notice the robot report due to there are many unread mails
> > in my inbox, I will try to reproduce it and take a deeper look at the
> > problem, maybe it is related with some special configs.
>
> I actually already have a patch for it, will post soon.

Thanks for the fix, I will test it once you post it.

I can confirm that the objtool warning is not related with
the patches in the branch objtool/urgent of tip.git, it is
related with CONFIG_STACKPROTECTOR which is default y, but
CONFIG_STACKPROTECTOR is not set in the robot randconfig
loongarch-randconfig-001-20250328 [1], there is no objtool
warning if CONFIG_STACKPROTECTOR is set.

I can also reproduce this issue when compiling with v6.14
if CONFIG_STACKPROTECTOR is not set.

[1] 
https://download.01.org/0day-ci/archive/20250328/202503280703.OARM8SrY-lkp@xxxxxxxxx/config

Thanks,
Tiezhu