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Date:   Mon, 28 Sep 2020 14:30:56 +0000
From:   Hao Lee <haolee.swjtu@...il.com>
To:     npiggin@...il.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org

dan.j.wiilliams@...el.com
Bcc: 
Subject: Can we remove the checking of CONFIG_ARCH_HAS_PTE_SPECIAL in
 __vm_insert_mixed?
Reply-To: 

In the current code, if the architecture supports PTE_SPECIAL,
__vm_insert_mixed() becomes a simple encapsulation of insert_pfn()
because it always calls insert_pfn() and never calls insert_page(). This
behavior is inconsistent with the function's name. As described in
commit 423bad600443 ("mm: add vm_insert_mixed"), this function is
designed to supports _both_ raw pfns and pfns with struct page, but in
architecture with PTE_SPECIAL, it treats the latter as the former. So, I
think we'd better remove the checking of CONFIG_ARCH_HAS_PTE_SPECIAL to
make the behavior consistent for all architectures. If my understanding
is right, I can submit a patch to fix this. Thanks.

Regards,
Hao Lee