Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) client-ip=2620:137:e000::3:3;
Date:   Sat, 7 Oct 2023 00:16:18 +0530
From:   Deepak R Varma <drv@mailo.com>
To:     Huacai Chen <chenhuacai@kernel.org>,
        WANG Xuerui <kernel@xen0n.name>, loongarch@lists.linux.dev,
        linux-kernel@vger.kernel.org
Cc:     Ira Weiny <ira.weiny@intel.com>,
        "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
Subject: kmap() transformation: Question about copy_user_highpage
Message-ID: <ZSBV+h/gjPWV7+Gj@runicha.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Precedence: bulk

Hello,
I am attempting to work on replacing the kmap[_atomic]() calls by
kmap_local_page() function call. A detail on this change can be found here [0].

I would like to know if this function: 
	arch/loongarch/mm/init.c::copy_user_highpage()
is currently in use or is it a dead code?

If this code is not in use, can this be removed instead? However, if it is in
use, can you comment why kmap_atomic() was preferred over kmap()
function call?

[0] https://lore.kernel.org/all/20201029222652.302358281@linutronix.de/

Thank you,
Deepak.