linux-kernel - Re: [linux-next:master 12681/13861] drivers/i2c/i2c-core-base.o: warning: objtool: __i2c_transfer+0x120: stack state mismatch: reg1[24]=-1+0 reg2[24]=-2-24

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Message-ID: <ozfqe7ppl6q632nzyimsxvs2vh2uanjaranc3kj4pca5uwzt7g@hmhmjvtvrmb2>
Date: Mon, 7 Apr 2025 23:29:26 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc: Philip Li <philip.li@...el.com>, kernel test robot <lkp@...el.com>, 
	Guenter Roeck <linux@...ck-us.net>, oe-kbuild-all@...ts.linux.dev, 
	Andrew Morton <akpm@...ux-foundation.org>, Linux Memory Management List <linux-mm@...ck.org>, 
	Alessandro Carminati <acarmina@...hat.com>, Peter Zijlstra <peterz@...radead.org>, 
	linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev
Subject: Re: [linux-next:master 12681/13861] drivers/i2c/i2c-core-base.o:
 warning: objtool: __i2c_transfer+0x120: stack state mismatch: reg1[24]=-1+0
 reg2[24]=-2-24

On Tue, Apr 08, 2025 at 10:45:51AM +0800, Tiezhu Yang wrote:
> So this is a run-time bug rather than a compile-time warning, it should
> put the option "-fno-shrink-wrap" outside CONFIG_OBJTOOL in
> arch/loongarch/Makefile as a workaround, like this:

If loongarch folks agree it's a compiler bug, it should be reported to
GCC, so the issue is better understood (and can get fixed).

Without understanding the root cause, we don't know if -fno-shrink-wrap
fixes it, or just makes this particular occurrence go away.

-- 
Josh