On Thu, Dec 03, 2015 at 05:24:45PM +0100, Petr Mladek wrote:

quoted

+++ b/arch/powerpc/include/asm/livepatch.h

@@ -0,0 +1,45 @@

[...]

quoted

+#include <linux/module.h>
+#include <linux/ftrace.h>
+
+#ifdef CONFIG_LIVEPATCH
+static inline int klp_check_compiler_support(void)
+{
+#if !defined(_CALL_ELF) || _CALL_ELF != 2

I am just curious why we do not check CC_USING_MPROFILE_KERNEL
like in the other similar locations. It would look less cryptic.
But I am not sure if it is precise enough.

Because a ppc with a gcc > 4.8.5 is not sufficient. The code
currently only works for the PPC ELF ABI v2, a.k.a. ppc64le.
But now that you say it, CC_USING_MPROFILE_KERNEL should go
into that condition as well. Thanks!

	Torsten