linux-kernel - Re: [PATCH] kbuild: lto: fix module versionings mismatch in incremental build

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Message-ID: <202106141554.A2D26986A@keescook>
Date:   Mon, 14 Jun 2021 16:09:45 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Lecopzer Chen <lecopzer.chen@...iatek.com>
Cc:     masahiroy@...nel.org, michal.lkml@...kovi.net, nathan@...nel.org,
        ndesaulniers@...gle.com, samitolvanen@...gle.com,
        linux-kbuild@...r.kernel.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, yj.chiang@...iatek.com
Subject: Re: [PATCH] kbuild: lto: fix module versionings mismatch in
 incremental build

On Mon, Jun 14, 2021 at 01:51:09PM +0800, Lecopzer Chen wrote:
> When building modules(CONFIG_...=m), I found some of module versions
> are incorrect and set to 0.
> This can be found in build log for first clean build which shows
> 
> WARNING: EXPORT symbol "XXXX" [drivers/XXX/XXX.ko] version generation failed, symbol will not be versioned.

I'm doing this, and I don't see the problem:

$ make LLVM=1 LLVM_IAS=1 distclean
$ make LLVM=1 LLVM_IAS=1 menuconfig
	*enable LTO*
	*enable a module*
$ make LLVM=1 LLVM_IAS=1 -j...

What series of commands (and .config) shows this for you?

-- 
Kees Cook