Commit 6eb6c801 authored by Janet Liu's avatar Janet Liu Committed by Catalin Marinas

arm64: kernel thread don't need to save fpsimd context.

kernel thread's default fpsimd state is zero. When fork a thread, if parent is kernel thread,
 and save hardware context to parent's fpsimd state, but this hardware context is user
process's context, because kernel thread don't use fpsimd, it will not introduce issue,
it add a little cost.
Signed-off-by: default avatarJanet Liu <janet.liu@spreadtrum.com>
Signed-off-by: default avatarChunyan Zhang <chunyan.zhang@spreadtrum.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 04d7e098
......@@ -233,7 +233,8 @@ void release_thread(struct task_struct *dead_task)
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
fpsimd_preserve_current_state();
if (current->mm)
fpsimd_preserve_current_state();
*dst = *src;
return 0;
}
......
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