RISC-V: don't assume PI mutexes and robust futexes before 4.20 (bug 23864)

Support for futex_cmpxchg as only been added to 4.20-rc1.

diff --git a/ChangeLog b/ChangeLog
index 4ff4c13..6be02a7 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2018-11-07  Andreas Schwab  <schwab@suse.de>
+
+       [BZ #23864]
+       * sysdeps/unix/sysv/linux/riscv/kernel-features.h
+       (__ASSUME_SET_ROBUST_LIST) [__LINUX_KERNEL_VERSION < 0x041400]:
+       Undef.
+
 2018-11-06  Joseph Myers  <joseph@codesourcery.com>
 
        [BZ #23862]

diff --git a/sysdeps/unix/sysv/linux/riscv/kernel-features.h b/sysdeps/unix/sysv/linux/riscv/kernel-features.h
index 37f4d99..d21c824 100644 (file)
--- a/sysdeps/unix/sysv/linux/riscv/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/riscv/kernel-features.h
@@ -21,3 +21,8 @@
 
 #undef __ASSUME_CLONE_DEFAULT
 #define __ASSUME_CLONE_BACKWARDS 1
+
+/* No support for PI mutexes or robust futexes before 4.20.  */
+#if __LINUX_KERNEL_VERSION < 0x041400
+# undef __ASSUME_SET_ROBUST_LIST
+#endif