arm64: fix possible invalid FPSIMD initialization state
If context switching happens during executing fpsimd_flush_thread(), stale value in FPSIMD registers will be saved into current thread's fpsimd_state by fpsimd_thread_switch(). That may cause invalid initialization state for the new process, so disable preemption when executing fpsimd_flush_thread(). Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Cc: Jiang Liu <liuj97@gmail.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
parent
fc18047c73
commit
6db83cea1c
|
@ -80,8 +80,10 @@ void fpsimd_thread_switch(struct task_struct *next)
|
|||
|
||||
void fpsimd_flush_thread(void)
|
||||
{
|
||||
preempt_disable();
|
||||
memset(¤t->thread.fpsimd_state, 0, sizeof(struct fpsimd_state));
|
||||
fpsimd_load_state(¤t->thread.fpsimd_state);
|
||||
preempt_enable();
|
||||
}
|
||||
|
||||
#ifdef CONFIG_KERNEL_MODE_NEON
|
||||
|
|
Loading…
Reference in a new issue