On Fri, Jun 21, 2019 at 11:41:31AM -0300, Jason Gunthorpe wrote:

quoted

 static bool gup_fast_permitted(unsigned long start, unsigned long end)
 {
-	return true;
+	return IS_ENABLED(CONFIG_HAVE_FAST_GUP) ? true : false;

The ?: is needed with IS_ENABLED?

It shouldn't, I'll fix it up.

I'd suggest to revise this block a tiny bit:

-#ifndef gup_fast_permitted
+#if !IS_ENABLED(CONFIG_HAVE_FAST_GUP) || !defined(gup_fast_permitted)
 /*
  * Check if it's allowed to use __get_user_pages_fast() for the range, or
  * we need to fall back to the slow version:
  */
-bool gup_fast_permitted(unsigned long start, int nr_pages)
+static bool gup_fast_permitted(unsigned long start, int nr_pages)
 {

Just in case some future arch code mismatches the header and kconfig..

IS_ENABLED outside a function doesn't really make sense.  But I'll
just life the IS_ENABLED(CONFIG_HAVE_FAST_GUP) checks into the two
callers.