[PATCH] archs: add Kconfig symbol for set memory ro feature

[Marco Stornelli]

From: Marco Stornelli <marco.stornelli@xxxxxxxxx>

This patch adds a new Kconfig symbol to recognize which arch implements a couple of functions set_memory_ro/set_memory_rw. These functions sets/unsets read-only flag at page table entry level. Until now only x86
has got these functions. Next target will be arm and powerpc.

Signed-off-by: Marco Stornelli <marco.stornelli@xxxxxxxxx>
---

--- linux-2.6.36-orig/arch/Kconfig	2010-09-13 01:07:37.000000000 +0200
+++ linux-2.6.36/arch/Kconfig	2010-10-30 10:27:16.000000000 +0200
@@ -83,6 +83,9 @@ config USER_RETURN_NOTIFIER
 config HAVE_IOREMAP_PROT
 	bool
 
+config HAVE_SET_MEMORY_RO
+	bool
+
 config HAVE_KPROBES
 	bool
 
--- linux-2.6.36-orig/arch/x86/Kconfig	2010-09-13 01:07:37.000000000 +0200
+++ linux-2.6.36/arch/x86/Kconfig	2010-10-30 10:27:38.000000000 +0200
@@ -26,6 +26,7 @@ config X86
 	select HAVE_OPROFILE
 	select HAVE_PERF_EVENTS if (!M386 && !M486)
 	select HAVE_IOREMAP_PROT
+	select HAVE_SET_MEMORY_RO
 	select HAVE_KPROBES
 	select ARCH_WANT_OPTIONAL_GPIOLIB
 	select ARCH_WANT_FRAME_POINTERS

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