[Bug libc/25954] Missing context-synchronizing instructions in pkey_set on POWER

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25954

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
Fixed for 2.32 via:

commit e627106266ad8785457fadbf5bf67ed604d2a353
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon May 11 11:20:02 2020 +0200

    POWER: Add context-synchronizing instructions to pkey_write [BZ #25954]

    Sandipan Das reported that,

    "The Power ISA mandates that all writes to the Authority
    Mask Register (AMR) must always be preceded as well as
    succeeded by a context-synchronizing instruction. This
    applies to both the privileged and unprivileged variants
    of the Move To AMR instruction.

    This [requirement] is from Table 6 of Chapter 11 in page 1134 of Power
    ISA 3.0B. The document can be found here:
    <https://ibm.ent.box.com/s/1hzcwkwf8rbju5h9iyf44wm94amnlcrv>
    "

    See this kernel patch submission:

   
<https://lore.kernel.org/linuxppc-dev/5f65cf37be993760de8112a88da194e3ccbb2bf8.1588959697.git.sandipan@linux.ibm.com/>

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