[SRU][Artful][v2][PATCH 0/1] UBUNTU: SAUCE: (no-up) s390: fix rwlock implementation

Joseph Salisbury joseph.salisbury at canonical.com
Fri May 11 13:31:33 UTC 2018

BugLink: http://bugs.launchpad.net/bugs/1761674

== SRU Justification ==
IBM reported this bug due to a regression introduced by mainline commit
94232a4332de.  IBM has requested this SAUCE backport to resolve this
regression in Artful and Xenial.  

With Bionic and v4.15, the rwlock code has been rewritten. See upstream git 
eb3b7b848fb3 ("s390/rwlock: introduce rwlock wait queueing").

Since the upstream code has been rewritten there also won't be an upstream 
git commit id available which contains the attached fix.

Xenial also requires this fix, but it's backport is differant.  It will
be sent in another SRU request.

== Fix ==
UBUNTU: SAUCE: (no-up) s390: fix rwlock implementation

== Regression Potential ==
Low.  The backport was written and tested by IBM. It is specific to s390.

== Test Case ==
A test kernel was built with this patch and tested by the original bug reporter.
The bug reporter states the test kernel resolved the bug.

Heiko Carstens (1):
  s390: fix rwlock implementation

 arch/s390/lib/spinlock.c | 46 +++++++++-------------------------------------
 1 file changed, 9 insertions(+), 37 deletions(-)


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