Public bug reported:
The upstream kernel has added refcount protection, in two ways. For
arches that have provided a fast refcount_t implementation, they get it
automatically (this is signaled by ARCH_HAS_REFCOUNT, which as of 4.20
kernels, is only the x86 arch). For other arches, they can get refcount
protection via the CONFIG_REFCOUNT_FULL configure option. The upstream
arm64 and arm maintainers have enabled this configuration by default for
those arches, which has been carried into the ubuntu kernel config. We
should enable that for our other arches that do not provide
ARCH_HAS_REFCOUNT, namely ppc64el and s390x, to gain protection parity
with the rest of the architectures supported by ubuntu kernels.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1811162
Title:
Turn on CONFIG_REFCOUNT_FULL for non-x86 arches
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