Andreas Schwab 4bf5ab3196 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.

(cherry picked from commit 295132ff052b32960207d82a950c0efbf0766857)
2019-03-14 22:59:06 +01:00
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