From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Fri, 22 Dec 2017 15:57:59 +0000 (-0500)
Subject: liburcu-bp: Use membarrier private expedited when available
X-Git-Tag: v0.11.0~45
X-Git-Url: https://git.lttng.org/?a=commitdiff_plain;ds=sidebyside;h=3745305bf09e7825e75ee5b5490347ee67c6efdd;hp=3745305bf09e7825e75ee5b5490347ee67c6efdd;p=urcu.git

liburcu-bp: Use membarrier private expedited when available

For the liburcu-bp 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-bp
will abort if running on a kernel that do not provide the membarrier
private expedited command (e.g. CONFIG_MEMBARRIER=n or kernel version
below 4.14).

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