Will Deacon 03110a5cb2 arm64: futex: Bound number of LDXR/STXR loops in FUTEX_WAKE_OP ... Our futex implementation makes use of LDXR/STXR loops to perform atomic updates to user memory from atomic context. This can lead to latency problems if we end up spinning around the LL/SC sequence at the expense of doing something useful. Rework our futex atomic operations so that we return -EAGAIN if we fail to update the futex word after 128 attempts. The core futex code will reschedule if necessary and we'll try again later. Cc: <stable@kernel.org> Fixes: 6170a97460 ("arm64: Atomic operations") Signed-off-by: Will Deacon <will.deacon@arm.com>		2019-04-26 13:57:43 +01:00
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asm	arm64: futex: Bound number of LDXR/STXR loops in FUTEX_WAKE_OP	2019-04-26 13:57:43 +01:00
uapi/asm	kbuild: force all architectures except um to include mandatory-y	2019-03-17 12:56:32 +09:00