linux-kernel - Re: [PATCH] ia64: Depend on non-static printk for cmpxchg debug

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Date:   Fri, 26 Feb 2021 13:47:20 +0000
From:   Chris Down <chris@...isdown.name>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH] ia64: Depend on non-static printk for cmpxchg debug

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@...er.hpl.hp.com>, Dec 9 
2002. No indication why it's extern, but it's been there since the dawn of 
ia64.