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

[Ingo Molnar]

* Josh Poimboeuf <jpoimboe@xxxxxxxxxx> 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@xxxxxxxxxxx>
> Fixes: cb8a2ef0848c ("LoongArch: Add ORC stack unwinder support")
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Closes: https://lore.kernel.org/oe-kbuild-all/202503280703.OARM8SrY-lkp@xxxxxxxxx/
> Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>

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.

Thanks,

	Ingo