ARM32: use dmb ish (inner shareable domain) for smp barriers

[urcu.git] / README.md

diff --git a/README.md b/README.md
index f6b290fbc4edca213b1d83dc7368581dd9e0aed9..7ce0edfeec0ef4203e286a4661eac6f7dd9ddeb1 100644 (file)
--- a/README.md
+++ b/README.md
@@ -43,6 +43,7 @@ Currently, the following architectures are supported:
   - S390, S390x
   - ARM 32/64
   - MIPS
+  - NIOS2
   - Alpha
   - ia64
   - Sparcv9 32/64
@@ -158,7 +159,11 @@ This is the preferred version of the library, in terms of
 grace-period detection speed, read-side speed and flexibility.
 Dynamically detects kernel support for `sys_membarrier()`. Falls back
 on `urcu-mb` scheme if support is not present, which has slower
-read-side.
+read-side. Use the --disable-sys-membarrier-fallback configure option
+to disable the fall back, thus requiring `sys_membarrier()` to be
+available. This gives a small speedup when `sys_membarrier()` is
+supported by the kernel, and aborts in the library constructor if not
+supported.
 
 
 ### Usage of `liburcu-qsbr`