arm64: Allow to enable PREEMPT_RT.

It is really time.

arm64 has all the required architecture related changes, that have been
identified over time, in order to enable PREEMPT_RT. With the recent
printk changes, the last known road block has been addressed.

Allow to enable PREEMPT_RT on arm64.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/all/20240906111841.562402-3-bigeasy@linutronix.de

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index ed15b876fa7490243a9a8f9409a55c34f5895247..7da710b21f76e2e28f3959df8191e4ece306a90f 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -100,6 +100,7 @@ config ARM64
        select ARCH_SUPPORTS_NUMA_BALANCING
        select ARCH_SUPPORTS_PAGE_TABLE_CHECK
        select ARCH_SUPPORTS_PER_VMA_LOCK
+       select ARCH_SUPPORTS_RT
        select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
        select ARCH_WANT_COMPAT_IPC_PARSE_VERSION if COMPAT
        select ARCH_WANT_DEFAULT_BPF_JIT