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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2021-07-29 13:52:14 +0300 |
|---|---|---|
| committer | Minda Chen <minda.chen@starfivetech.com> | 2023-11-06 14:24:52 +0300 |
| commit | dcc75fc8b5cf7334fc212c72538827796803c35a (patch) | |
| tree | 1e0c08f1239f63e49d212e7badc045ffad8b0842 | |
| parent | b77bc48a663da7cb5501e60c33914e2bacd939f3 (diff) | |
| download | linux-dcc75fc8b5cf7334fc212c72538827796803c35a.tar.xz | |
arm64/sve: Delay freeing memory in fpsimd_flush_thread()
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>
| -rw-r--r-- | arch/arm64/kernel/fpsimd.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index ff4962750b3d..5e5a869b1f3a 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -1033,6 +1033,7 @@ void fpsimd_thread_switch(struct task_struct *next) 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); } /* |