linux-kernel - Re: [PATCH] loongarch: Only select HAVE_OBJTOOL and allow ORC unwinder if the inline assembler supports R_LARCH_{32,64}

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Date: Tue, 4 Jun 2024 23:25:48 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Xi Ruoyao <xry111@...111.site>
Cc: Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>,
	Tiezhu Yang <yangtiezhu@...ngson.cn>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Youling Tang <tangyouling@...inos.cn>,
	Jinyang He <hejinyang@...ngson.cn>, loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
	mengqinggang@...ngson.cn, cailulu@...ngson.cn, wanglei@...ngson.cn,
	luweining@...ngson.cn, Yujie Liu <yujie.liu@...el.com>,
	Heng Qi <hengqi@...ux.alibaba.com>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] loongarch: Only select HAVE_OBJTOOL and allow ORC
 unwinder if the inline assembler supports R_LARCH_{32,64}_PCREL

On Wed, Jun 05, 2024 at 01:54:24PM +0800, Xi Ruoyao wrote:
> On Tue, 2024-06-04 at 22:43 -0700, Nathan Chancellor wrote:
> > For what it's worth, I have noticed some warnings with clang that I
> > don't see with GCC but I only filed an issue on our GitHub and never
> > followed up on the mailing list, so sorry about that.
> > 
> > https://github.com/ClangBuiltLinux/linux/issues/2024
> > 
> > Might be tangential to this patch though but I felt it was worth
> > mentioning.
> 
> The warnings in GCC build is definitely the issue handled by this patch.
> But the warnings in Clang build should be a different issue.  Can you
> attach the kernel/events/core.o file from the Clang build for analysis?
> I guess we need to disable more optimization...

Sure thing. Let me know if there are any issues with the attachment.

Cheers,
Nathan

Download attachment "core.o" of type "application/octet-stream" (270384 bytes)