Hi David,

Thanks a lot for your deep review on this series.

On 25/03/2018 23:50, David Rientjes wrote:

On Tue, 13 Mar 2018, Laurent Dufour wrote:

quoted

This configuration variable will be used to build the code needed to
handle speculative page fault.

By default it is turned off, and activated depending on architecture
support.

Suggested-by: Thomas Gleixner <redacted>
Signed-off-by: Laurent Dufour <redacted>
---
 mm/Kconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index abefa573bcd8..07c566c88faf 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig

@@ -759,3 +759,6 @@ config GUP_BENCHMARK
 	  performance of get_user_pages_fast().
 
 	  See tools/testing/selftests/vm/gup_benchmark.c
+
+config SPECULATIVE_PAGE_FAULT
+       bool

Should this be configurable even if the arch supports it?

Actually, this is not configurable unless by manually editing the .config file.

I made it this way on the Thomas's request :
https://lkml.org/lkml/2018/1/15/969

That sounds to be the smarter way to achieve that, isn't it ?

Laurent.