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Diffstat (limited to 'arch/arm64/kernel/fpsimd.c')
-rw-r--r--arch/arm64/kernel/fpsimd.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index e8b8357aedb4..bb785d23dbde 100644
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -21,6 +21,7 @@
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/signal.h>
+#include <linux/hardirq.h>
#include <asm/fpsimd.h>
#include <asm/cputype.h>
@@ -79,10 +80,39 @@ void fpsimd_thread_switch(struct task_struct *next)
void fpsimd_flush_thread(void)
{
+ preempt_disable();
memset(&current->thread.fpsimd_state, 0, sizeof(struct fpsimd_state));
fpsimd_load_state(&current->thread.fpsimd_state);
+ preempt_enable();
}
+#ifdef CONFIG_KERNEL_MODE_NEON
+
+/*
+ * Kernel-side NEON support functions
+ */
+void kernel_neon_begin(void)
+{
+ /* Avoid using the NEON in interrupt context */
+ BUG_ON(in_interrupt());
+ preempt_disable();
+
+ if (current->mm)
+ fpsimd_save_state(&current->thread.fpsimd_state);
+}
+EXPORT_SYMBOL(kernel_neon_begin);
+
+void kernel_neon_end(void)
+{
+ if (current->mm)
+ fpsimd_load_state(&current->thread.fpsimd_state);
+
+ preempt_enable();
+}
+EXPORT_SYMBOL(kernel_neon_end);
+
+#endif /* CONFIG_KERNEL_MODE_NEON */
+
/*
* FP/SIMD support code initialisation.
*/