Re: [PATCH v8 8/8] livepatch: Detect offset for the ftrace location during build

On Tue, Feb 16, 2016 at 11:17:02AM +0530, Kamalesh Babulal wrote:

* Petr Mladek [off-list ref] [2016-02-12 17:45:17]:

quoted

 int test(int a)
 {
+	printk("%d\n", a);
 	return ++a;
 }

Thanks. This workaround, helped to load sample livepatch module.

N.b.: if you try to livepatch/trace such a leaf function without
global dependencies, it will crash if that function got called with
a different TOC value. Hence this whole testing.

You may alternatively try my gcc patch ;-)

Another caveat is functions with stack arguments (>8 args, varargs).
My code needs special precautions then because of the return helper.

	Torsten