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Date:   Fri, 26 Feb 2021 13:47:20 +0000
From:   Chris Down <chris@chrisdown.name>
To:     Matthew Wilcox <willy@infradead.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        Tony Luck <tony.luck@intel.com>,
        Fenghua Yu <fenghua.yu@intel.com>, linux-ia64@vger.kernel.org,
        linux-kernel@vger.kernel.org, kernel-team@fb.com
Subject: Re: [PATCH] ia64: Depend on non-static printk for cmpxchg debug
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Chris Down writes:
>I must confess I have no idea of the history of why it was `extern 
>int` in the first place -- my fear was somehow we use cmpxchg.h from a 
>different context.  Do you have any idea? :-)

Ok, found where it's introduced in the pre-git archives: "New file 
asm-ia64/intrinsics.h." from David Mosberger <davidm@tiger.hpl.hp.com>, Dec 9 
2002. No indication why it's extern, but it's been there since the dawn of 
ia64.