1 files changed, 58 insertions, 0 deletions

diff --git a/meta/recipes-core/glibc/glibc/0001-Add-atomic_exchange_relaxed.patch b/meta/recipes-core/glibc/glibc/0001-Add-atomic_exchange_relaxed.patch
new file mode 100644
index 0000000000..a33a135f78
--- /dev/null
+++ b/meta/recipes-core/glibc/glibc/0001-Add-atomic_exchange_relaxed.patch
@@ -0,0 +1,58 @@
+From ce74a620bf9e1a40b7ba06d35160e20633a4d8bb Mon Sep 17 00:00:00 2001
+From: Catalin Enache <catalin.enache@windriver.com>
+Date: Fri, 7 Jul 2017 13:11:16 +0300
+Subject: [PATCH 1/6] Add atomic_exchange_relaxed.
+
+* include/atomic.h (atomic_exchange_relaxed): New
+
+Upstream-Status: Backport
+
+Author: Torvald Riegel <triegel@redhat.com>
+Signed-off-by: Catalin Enache <catalin.enache@windriver.com>
+---
+ ChangeLog        | 4 ++++
+ include/atomic.h | 9 +++++++++
+ 2 files changed, 13 insertions(+)
+
+diff --git a/ChangeLog b/ChangeLog
+index 0fbda90..cb87279 100644
+--- a/ChangeLog
++++ b/ChangeLog
+@@ -1,3 +1,7 @@
++2016-08-05  Torvald Riegel  <triegel@redhat.com>
++
++       * include/atomic.h (atomic_exchange_relaxed): New.
++
+ 2016-01-28  Carlos O'Donell  <carlos@redhat.com>
+            Alexey Makhalov <amakhalov@vmware.com>
+            Florian Weimer <fweimer@redhat.com>
+diff --git a/include/atomic.h b/include/atomic.h
+index ad3db25..129ee24 100644
+--- a/include/atomic.h
++++ b/include/atomic.h
+@@ -588,6 +588,9 @@ void __atomic_link_error (void);
+   __atomic_compare_exchange_n ((mem), (expected), (desired), 1,                      \
+     __ATOMIC_RELEASE, __ATOMIC_RELAXED); })
+ 
++# define atomic_exchange_relaxed(mem, desired) \
++  ({ __atomic_check_size((mem));                                             \
++  __atomic_exchange_n ((mem), (desired), __ATOMIC_RELAXED); })
+ # define atomic_exchange_acquire(mem, desired) \
+   ({ __atomic_check_size((mem));                                             \
+   __atomic_exchange_n ((mem), (desired), __ATOMIC_ACQUIRE); })
+@@ -684,6 +687,12 @@ void __atomic_link_error (void);
+    *(expected) == __atg103_expected; })
+ # endif
+ 
++/* XXX Fall back to acquire MO because archs do not define a weaker
++   atomic_exchange.  */
++# ifndef atomic_exchange_relaxed
++#  define atomic_exchange_relaxed(mem, val) \
++   atomic_exchange_acq ((mem), (val))
++# endif
+ # ifndef atomic_exchange_acquire
+ #  define atomic_exchange_acquire(mem, val) \
+    atomic_exchange_acq ((mem), (val))
+-- 
+2.10.2
+