[PATCH v3 02/17] ARM: add self test for runtime patch mechanism

This patch adds basic sanity tests to ensure that the instruction patching
results in valid instruction encodings.  This is done by verifying the output
of the patch process against a vector of assembler generated instructions at
init time.

Signed-off-by: Cyril Chemparathy <redacted>
---
 arch/arm/Kconfig                |   12 +++++++
 arch/arm/kernel/runtime-patch.c |   75 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 87 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 36de4ea..bfcd29d 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig

@@ -207,6 +207,18 @@ config ARM_PATCH_PHYS_VIRT
 	  this feature (eg, building a kernel for a single machine) and
 	  you need to shrink the kernel to the minimal size.
 
+config ARM_RUNTIME_PATCH_TEST
+	bool "Self test runtime patching mechanism" if ARM_RUNTIME_PATCH
+	default y

@@ -189,5 +261,8 @@ void __init runtime_patch_kernel(void)
 	const void *start = &__runtime_patch_table_begin;
 	const void *end   = &__runtime_patch_table_end;
 
+#ifdef CONFIG_ARM_RUNTIME_PATCH_TEST
+	runtime_patch_test();
+#endif
 	BUG_ON(runtime_patch(start, end - start));