Bugs fix up for DEBUG_WX

These patches fix some bugs of DEBUG_WX. The first one is removing the name of arm64 page talbe use. The second one is adding MMU dependency, otherwise, it causes build error on NOMMU system, which reported by kbuild test.

Zong Li (2):
mm: remove the specific name of arm64
mm: add MMU dependency for DEBUG_WX

 mm/Kconfig.debug | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

2.26.2

UXN is the name of arm64 page-table descriptors.

---
 mm/Kconfig.debug | 2 --
 1 file changed, 2 deletions(-)

index e19f94c6df90..b8cbe035247f 100644
@@ -130,8 +130,6 @@ config DEBUG_WX
 
 	  This is useful for discovering cases where the kernel is leaving W+X
 	  mappings after applying NX, as such mappings are a security risk.
-	  This check also includes UXN, which should be set on all kernel
-	  mappings.
 
 	  Look for a message in dmesg output like this:
 

2.26.2

DEBUG_WX should be enabled on MMU system. It had got build error when enabling DEBUG_WX on NOMMU.

---
 mm/Kconfig.debug | 1 +
 1 file changed, 1 insertion(+)

index b8cbe035247f..2409f7fc1567 100644
@@ -124,6 +124,7 @@ config ARCH_HAS_DEBUG_WX
 config DEBUG_WX
 	bool "Warn on W+X mappings at boot"
 	depends on ARCH_HAS_DEBUG_WX
+	depends on MMU
 	select PTDUMP_CORE
 	help
 	  Generate a warning if any W+X mappings are found at boot.

2.26.2