Re: [PATCH][v4] livepatch/ppc: Enable livepatching on powerpc

* Petr Mladek [off-list ref] [2016-03-03 17:52:01]:

From: Balbir Singh <bsingharora@gmail.com>

Changelog v4:
	1. Renamed klp_matchaddr() to klp_get_ftrace_location()
	   and used it just to convert the function address.
	2. Synced klp_write_module_reloc() with s390(); made it
	   inline, no error message, return -ENOSYS
	3. Added an error message when including
	   powerpc/include/asm/livepatch.h without HAVE_LIVEPATCH
	4. Update some comments.
Changelog v3:
	1. Moved -ENOSYS to -EINVAL in klp_write_module_reloc
	2. Moved klp_matchaddr to use ftrace_location_range
Changelog v2:
	1. Implement review comments by Michael
	2. The previous version compared _NIP from the
	   wrong location to check for whether we
	   are going to a patched location

This applies on top of the patches posted by Michael
https://patchwork.ozlabs.org/patch/589791/

It enables livepatching. This takes patch 6/8 and 7/8 of v8 as the base.
(See the reference [1] below) and adds logic for checking offset ranges
in livepatch with ftrace_location_range.

I tested the sample in the livepatch

Signed-off-by: Torsten Duwe <redacted>
Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>

Reviewed-by: Kamalesh Babulal <redacted>

I tried it, with the sample livepatch module.

Tested-by: Kamalesh Babulal <redacted>



Thanks,
Kamalesh.