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Diffstat (limited to '')
-rw-r--r-- | debian/patches-rt/0271-arm64-fpsimd-Delay-freeing-memory-in-fpsimd_flush_th.patch | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/debian/patches-rt/0271-arm64-fpsimd-Delay-freeing-memory-in-fpsimd_flush_th.patch b/debian/patches-rt/0271-arm64-fpsimd-Delay-freeing-memory-in-fpsimd_flush_th.patch new file mode 100644 index 000000000..733617e78 --- /dev/null +++ b/debian/patches-rt/0271-arm64-fpsimd-Delay-freeing-memory-in-fpsimd_flush_th.patch @@ -0,0 +1,66 @@ +From d0fe894184b649a8d383fa8d2db7ae3233b04428 Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Wed, 25 Jul 2018 14:02:38 +0200 +Subject: [PATCH 271/323] arm64: fpsimd: Delay freeing memory in + fpsimd_flush_thread() +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.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 | 14 +++++++++++++- + 1 file changed, 13 insertions(+), 1 deletion(-) + +diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c +index a9bbfb800ec2..aa631771e0dc 100644 +--- a/arch/arm64/kernel/fpsimd.c ++++ b/arch/arm64/kernel/fpsimd.c +@@ -226,6 +226,16 @@ static void sve_free(struct task_struct *task) + __sve_free(task); + } + ++static void *sve_free_atomic(struct task_struct *task) ++{ ++ void *sve_state = task->thread.sve_state; ++ ++ WARN_ON(test_tsk_thread_flag(task, TIF_SVE)); ++ ++ task->thread.sve_state = NULL; ++ return sve_state; ++} ++ + /* + * TIF_SVE controls whether a task can use SVE without trapping while + * in userspace, and also the way a task's FPSIMD/SVE state is stored +@@ -1022,6 +1032,7 @@ void fpsimd_thread_switch(struct task_struct *next) + void fpsimd_flush_thread(void) + { + int vl, supported_vl; ++ void *mem = NULL; + + if (!system_supports_fpsimd()) + return; +@@ -1034,7 +1045,7 @@ void fpsimd_flush_thread(void) + + if (system_supports_sve()) { + clear_thread_flag(TIF_SVE); +- sve_free(current); ++ mem = sve_free_atomic(current); + + /* + * Reset the task vector length as required. +@@ -1068,6 +1079,7 @@ void fpsimd_flush_thread(void) + } + + put_cpu_fpsimd_context(); ++ kfree(mem); + } + + /* +-- +2.43.0 + |