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SubjectRe: [RFC][PATCH][v2] Enable livepatching for powerpc
* Balbir Singh <bsingharora@gmail.com> [2016-03-03 18:00:54]:

> Changelog:
> 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.
> Removes the extra strict check in gcc-profile-kernel-notrace.sh
> and adds logic for checking offsets in livepatch. The patch
> for HAVE_C_RECORDMCOUNT is not required and not used here.
>
> Depending on whether or not a TOC is generated, the offset
> for _mcount can be +16,+12,+8,+4. The changes are such that the
> offset checks are specific to powerpc.
>
> TODOs
> 1. Build a version with offsets removed and rebuild
> ftrace_location() sort of functionality
> 2. Make livepatching experimental on powerpc
>
> Comments? Testing? I tested the sample in the livepatch
> directory
>
> References
>
> 1. https://patchwork.ozlabs.org/patch/581521/
> 2. https://patchwork.ozlabs.org/patch/587464/
>
> Signed-off-by: Torsten Duwe <duwe@suse.de>
> Signed-off-by: Balbir Singh <bsingharora@gmail.com>

Tested-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>


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