[PATCH 2/3] mm: replace __HAVE_ARCH_PTE_SPECIAL

On Mon, 9 Apr 2018, Christoph Hellwig wrote:

quoted

-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 # define HAVE_PTE_SPECIAL 1
 #else
 # define HAVE_PTE_SPECIAL 0

I'd say kill this odd indirection and just use the
CONFIG_ARCH_HAS_PTE_SPECIAL symbol directly.

Agree, and I think it would be easier to audit/review if patches 1 and 3 
were folded together to see the relationship between the newly added 
selects and what #define's it is replacing.  Otherwise, looks good!