[PATCH] mm: Mark idle page tracking as BROKEN

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

In discussion with other MM developers around how idle page tracking
should be fixed for transparent huge pages, several expressed the opinion
that it should be removed as it is inefficient at accomplishing the
job that it is supposed to, and we have better mechanisms (eg uffd) for
accomplishing the same goals these days.

Mark the feature as BROKEN for now and we can remove it entirely in a
few months if nobody complains.  It is not enabled by Android, ChromeOS,
Debian, Fedora or SUSE.  Red Hat enabled it with RHEL-8.1 and UEK followed
suit, but I have been unable to find why RHEL enabled it.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 mm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index 02d44e3420f5..311b50bb92ce 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -772,7 +772,7 @@ config DEFERRED_STRUCT_PAGE_INIT
 
 config IDLE_PAGE_TRACKING
 	bool "Enable idle page tracking"
-	depends on SYSFS && MMU
+	depends on SYSFS && MMU && BROKEN
 	select PAGE_EXTENSION if !64BIT
 	help
 	  This feature allows to estimate the amount of user pages that have
-- 
2.30.2