From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Thu, 21 Dec 2017 18:42:23 +0000 (-0500)
Subject: liburcu: Use membarrier private expedited when available
X-Git-Tag: v0.11.0~46
X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=commitdiff_plain;h=c0bb9f693f926595a7cb8b4ce712cef08d9f5d49;hp=c0bb9f693f926595a7cb8b4ce712cef08d9f5d49

liburcu: Use membarrier private expedited when available

For the liburcu flavor, use the membarrier private expedited
command when available. It is faster than the shared expedited
command, but has only been introduced in 4.14 Linux kernels.

When configured with --disable-sys-membarrier-fallback, liburcu
will abort if running on a kernel that provide neither the shared
nor the private expedited membarrier commands. This is the case
if running on a CONFIG_MEMBARRIER=n kernel, or a kernel version
below 4.3.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---