diff options
Diffstat (limited to 'debian/patches-rt/arm64-sve-Delay-freeing-memory-in-fpsimd_flush_threa.patch')
| -rw-r--r-- | debian/patches-rt/arm64-sve-Delay-freeing-memory-in-fpsimd_flush_threa.patch | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/debian/patches-rt/arm64-sve-Delay-freeing-memory-in-fpsimd_flush_threa.patch b/debian/patches-rt/arm64-sve-Delay-freeing-memory-in-fpsimd_flush_threa.patch new file mode 100644 index 000000000..3912d4215 --- /dev/null +++ b/debian/patches-rt/arm64-sve-Delay-freeing-memory-in-fpsimd_flush_threa.patch @@ -0,0 +1,45 @@ +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); + } + + /* |