[PATCH RT] arm64: fpsimd: use a local_lock() in addition to local_bh_disable()
From: bigeasy@linutronix.de (Sebastian Andrzej Siewior)
Date: 2018-05-22 17:21:19
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linux-rt-users, lkml
On 2018-05-22 13:10:04 [-0400], Steven Rostedt wrote:
On Thu, 17 May 2018 14:40:06 +0200 Sebastian Andrzej Siewior [off-list ref] wrote:quoted
+static DEFINE_LOCAL_IRQ_LOCK(fpsimd_lock); /* * Update current's FPSIMD/SVE registers from thread_struct. *@@ -594,6 +595,7 @@ int sve_set_vector_length(struct task_struct *task, * non-SVE thread. */ if (task == current) { + local_lock(fpsimd_lock); local_bh_disable();I'm surprised that we don't have a "local_lock_bh()"?
right. Like the last time when we introduced a global lock with no locking context?
-- Stevequoted
task_fpsimd_save();
Sebastian