From 8496c88699ea71aea6a8a244f20df4fcd558ffba Mon Sep 17 00:00:00 2001 From: Simon Marchi Date: Fri, 6 Dec 2013 16:17:55 -0500 Subject: [PATCH] Set RCU_HAVE_FENCE to false on Intel Xeon Phi It currently fails to compile, because the Phi does not have fence instructions. It will use lock prefixed instructions for all memory barriers, which is overkill for this platform, but at least it will work. Signed-off-by: Simon Marchi Signed-off-by: Mathieu Desnoyers --- configure.ac | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/configure.ac b/configure.ac index 774094e..079c145 100644 --- a/configure.ac +++ b/configure.ac @@ -140,7 +140,10 @@ AS_IF([test "x$ARCHTYPE" = "xx86"],[ #For now, using lock; addl compatibility mode even for i686, because the #Pentium III is seen as a i686, but lacks mfence instruction. #Only using fence for x86_64. - AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[ + # + #k1om is the name for the Intel MIC family (Xeon Phi). It is an x86_64 + #variant but lacks fence instructions. + AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686" -a "x$host_vendor" != "xk1om"],[ AC_MSG_RESULT([yes]) AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1]) ],[ -- 2.34.1