From f8be71ca8cdd77386cad8fe098dddf4204914be3 Mon Sep 17 00:00:00 2001
From: Carlos O'Donell <carlos@redhat.com>
Date: Sat, 27 Sep 2014 12:31:11 -0400
Subject: [PATCH] Resolves: #1146967

- Disable more Intel TSX usage in rwlocks (#1146967).

Conflicts:
	glibc.spec
---
 glibc-disable-rwlock-elision.patch | 22 ++++++++++++++++++++++
 glibc.spec                         |  7 +++++++
 2 files changed, 29 insertions(+)
 create mode 100644 glibc-disable-rwlock-elision.patch

diff --git a/glibc-disable-rwlock-elision.patch b/glibc-disable-rwlock-elision.patch
new file mode 100644
index 0000000..b782da0
--- /dev/null
+++ b/glibc-disable-rwlock-elision.patch
@@ -0,0 +1,22 @@
+diff -urN glibc-2.20.mod/sysdeps/unix/sysv/linux/x86/elision-conf.c glibc-2.20/sysdeps/unix/sysv/linux/x86/elision-conf.c
+--- glibc-2.20.mod/sysdeps/unix/sysv/linux/x86/elision-conf.c	2014-09-27 00:25:46.443462345 -0400
++++ glibc-2.20/sysdeps/unix/sysv/linux/x86/elision-conf.c	2014-09-27 00:29:53.586615813 -0400
+@@ -62,12 +62,16 @@
+ 	      char **argv  __attribute__ ((unused)),
+ 	      char **environ)
+ {
+-  __elision_available = HAS_RTM;
+ #ifdef ENABLE_LOCK_ELISION
++  __elision_available = HAS_RTM;
+   __pthread_force_elision = __libc_enable_secure ? 0 : __elision_available;
+-#endif
+   if (!HAS_RTM)
+     __elision_aconf.retry_try_xbegin = 0; /* Disable elision on rwlocks */
++#else
++  __elision_available = 0;
++  __pthread_force_elision = 0;
++  __elision_aconf.retry_try_xbegin = 0;
++#endif
+ }
+ 
+ #ifdef SHARED
diff --git a/glibc.spec b/glibc.spec
index eadca57..b5ea3ff 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -193,6 +193,9 @@ Patch0050: %{name}-rh1124987.patch
 # Fix the tst-strtod-round.c test build failure.
 Patch0051: %{name}-stdlib-tst-strtod-round.c-Fix-build-on-ARM.patch
 
+# Disable rwlock elision if --enable-lock-elision is not used.
+Patch0052: %{name}-disable-rwlock-elision.patch
+
 ##############################################################################
 #
 # Patches from upstream
@@ -565,6 +568,7 @@ package or when debugging this package.
 %patch2034 -p1
 %patch0050 -p1
 %patch0051 -p1
+%patch0052 -p1
 
 ##############################################################################
 # %%prep - Additional prep required...
@@ -1722,6 +1726,9 @@ rm -f *.filelist*
 %endif
 
 %changelog
+* Tue Sep 30 2014 Siddhesh Poyarekar <siddhesh@redhat.com> - 2.20.90-6
+- Disable more Intel TSX usage in rwlocks (#1146967).
+
 * Fri Sep 26 2014 Carlos O'Donell <carlos@redhat.com> - 2.20.90-5
 - Disable lock elision support for Intel hardware until microcode
   updates can be done in early bootup (#1146967).