Bruce, Yocto kernel folks:

Here is another 4.12.x stable update "extension" primarily created for
the Yocto project, continuing on top of the previous v4.12.21 kernel.

There about 125 commits here, with the main thing being addition of the
ARM/64 mainline retpoline commits based on what was used for 4.14-stable.
The next biggest thing was a tracing update that was implicitly required
after the x86 ktpi/retpoline changes.  And there were some additional
mainline commits added to cover the gap between 4.12 and the 4.14.

Since just like x86, these recent largely pulicised security issues also
end up making changes to the low level ARM code, I boot tested both ARM
and ARM64 - standard and preempt-rt variants under qemu.

As usual, I've put this 4.12.x queue through the various testing that I
figured made sense, which includes but is not limited to:

-x86-64 sanity boot test + workloads of defconfig on COTS Core2 box.
-build MIPS, PPC, ARM, ARM64 with defconfig
-build x86-64 allmodconfig/allyesconfig
-build i386 allmodconfig/allyesconfig
-test x86-64 with preempt-rt patches.
-test arm/arm64 with and without preempt-rt patches

I bumped the 4.12 Makefile and did the signed tag just as per the previously
released 4.12.x versions.

Please find a signed v4.12.22 tag using this key:

in the repo in the directory here:

for merge to standard/base in linux-yocto-4.12 and then out from there
into the other base and BSP branches.

For those who are interested, the evolution of the commits is here:

This repo isn't needed for anything; it just exists for transparency and
so people can see the raw commits that were used to create this 4.12.x
release, similar to Greg's stable queue:

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