Re: [PATCH 08/11] objtool/loongarch: Add unwind hints in prepare_frametrace()

[Ingo Molnar <mingo@kernel.org>]

* Tiezhu Yang <yangtiezhu@loongson.cn> wrote:

> On 04/01/2025 03:08 PM, Ingo Molnar wrote:
> > 
> > * Josh Poimboeuf <jpoimboe@kernel.org> wrote:
> > 
> > > If 'regs' points to a local stack variable, prepare_frametrace() stores
> > > all registers to the stack.  This confuses objtool as it expects them to
> > > be restored from the stack later.
> > > 
> > > The stores don't affect stack tracing, so use unwind hints to hide them
> > > from objtool.
> > > 
> > > Fixes the following warnings:
> > > 
> > >   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
> > > 
> > > Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
> > > Fixes: cb8a2ef0848c ("LoongArch: Add ORC stack unwinder support")
> > > Reported-by: kernel test robot <lkp@intel.com>
> > > Closes: https://lore.kernel.org/oe-kbuild-all/202503280703.OARM8SrY-lkp@intel.com/
> > > Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
> > 
> > Note, I skipped this fix from tip:objtool/urgent for the time being,
> > because Tiezhu Yang indicated that he'd be reviewing and testing this
> > patch.
> 
> Tested-by: Tiezhu Yang <yangtiezhu@loongson.cn>

Thank you! Is it fine with you if I send this fix with tonight's 
objtool/urgent pull request to Linus?

Thanks,

	Ingo