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Date:   Sun, 14 Apr 2019 22:51:09 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Heinrich Schuchardt <xypron.glpk@....de>
Cc:     Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 1/1] arm: mm: Export __sync_icache_dcache() for
 xen-privcmd

On Sat, Apr 13, 2019 at 06:30:52PM +0200, Heinrich Schuchardt wrote:
> This patch avoids
> ERROR: "__sync_icache_dcache" [drivers/xen/xen-privcmd.ko] undefined!
> observed when compiling v4.19.34.
> 
> The xen-privcmd driver, which can be modular, calls set_pte_at()
> which in turn may call __sync_icache_dcache().

Maybe that really is a sign that it should not be modular..

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