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From:   Arvind Sankar <nivedita@alum.mit.edu>
Date:   Tue, 7 Jul 2020 17:59:25 -0400
To:     Nick Terrell <nickrterrell@gmail.com>
Cc:     Borislav Petkov <bp@alien8.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-kernel@vger.kernel.org, Chris Mason <clm@fb.com>,
        linux-kbuild@vger.kernel.org, x86@kernel.org,
        gregkh@linuxfoundation.org, Petr Malat <oss@malat.biz>,
        Kees Cook <keescook@chromium.org>,
        Kernel Team <Kernel-team@fb.com>,
        Adam Borowski <kilobyte@angband.pl>,
        Patrick Williams <patrickw3@fb.com>, rmikey@fb.com,
        mingo@kernel.org, Patrick Williams <patrick@stwcx.xyz>,
        Sedat Dilek <sedat.dilek@gmail.com>,
        Norbert Lange <nolange79@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Nick Terrell <terrelln@fb.com>
Subject: Re: [PATCH v6 2/8] lib: prepare xxhash for preboot environment
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 <20200707034604.1539157-3-nickrterrell@gmail.com>
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On Mon, Jul 06, 2020 at 08:45:58PM -0700, Nick Terrell wrote:
> From: Nick Terrell <terrelln@fb.com>
> 
> Don't export symbols if XXH_PREBOOT is defined.
> 
> This change is necessary to get xxhash to work in a preboot environment,
> which is needed to support zstd-compressed kernels.

The usual way to do it is by adding -D__DISABLE_EXPORTS to the CFLAGS, which will
cause EXPORT_SYMBOL to be stubbed out. Doesn't that work here?