[Skiboot] skiboot 5.10.6

[Stewart Smith]

skiboot-5.10.6
**************

skiboot 5.10.6 was released on Monday May 28th, 2018. It replaces
skiboot-5.10.5 as the current stable release in the 5.10.x series.

It is recommended that 5.10.6 be used instead of any previous 5.10.x
version, especially due to the locking bug fixes.

It is expected that this will be the final 5.10.x version, with 6.0.x
taking over as the main stable branch.

Over skiboot-5.10.5, we have the following fixes:

* opal-prd: Do not error out on first failure for soft/hard offline.

  The memory errors (CEs and UEs) that are detected as part of
  background memory scrubbing are reported by PRD asynchronously to
  opal-prd along with affected memory ranges. hservice_memory_error()
  converts these ranges into page granularity before hooking up them
  to soft/hard offline-ing infrastructure.

  But the current implementation of hservice_memory_error() does not
  hookup all the pages to soft/hard offline-ing if any of the page
  offline action fails. e.g hard offline can fail for:

  * Pages that are not part of buddy managed pool.

  * Pages that are reserved by kernel using memblock_reserved()

  * Pages that are in use by kernel.

  But for the pages that are in use by user space application, the
  hard offline marks the page as hwpoison, sends SIGBUS signal to kill
  the affected application as recovery action and returns success.

  Hence, It is possible that some of the pages in that memory range
  are in use by application or free. By stopping on first error we
  loose the opportunity to hwpoison the subsequent pages which may be
  free or in use by application. This patch fixes this issue.

* xive: fix missing unlock in error path

  Found with sparse and some added lock annotations.

* OPAL_PCI_SET_POWER_STATE: fix locking in error paths

  Otherwise we could exit OPAL holding locks, potentially leading to
  all sorts of problems later on.

-- 
Stewart Smith
OPAL Architect, IBM.