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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 29 Jul 2021 12:52:14 +0200
Subject: [PATCH] arm64/sve: Delay freeing memory in fpsimd_flush_thread()
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.15/older/patches-5.15.3-rt21.tar.xz
fpsimd_flush_thread() invokes kfree() via sve_free() within a preempt disabled
section which is not working on -RT.
Delay freeing of memory until preemption is enabled again.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
arch/arm64/kernel/fpsimd.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -1033,6 +1033,7 @@ void fpsimd_thread_switch(struct task_st
void fpsimd_flush_thread(void)
{
int vl, supported_vl;
+ void *sve_state = NULL;
if (!system_supports_fpsimd())
return;
@@ -1045,7 +1046,10 @@ void fpsimd_flush_thread(void)
if (system_supports_sve()) {
clear_thread_flag(TIF_SVE);
- sve_free(current);
+
+ /* Defer kfree() while in atomic context */
+ sve_state = current->thread.sve_state;
+ current->thread.sve_state = NULL;
/*
* Reset the task vector length as required.
@@ -1079,6 +1083,7 @@ void fpsimd_flush_thread(void)
}
put_cpu_fpsimd_context();
+ kfree(sve_state);
}
/*
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