Since commit:
6eb6c80187c55b7f ("arm64: kernel thread don't need to save fpsimd context.")
... we skip saving the fpsimd state for kernel threads in
arch_dup_task_struct(). We determine whether current is a kthread by
looking at current->mm.
In general, a non-NULL current->mm doesn't imply that current is a
kthread, as kthreads can install an mm via use_mm(), and so it's
preferable to use is_kthread() to determine whether a thread is a
kthread.
For consistency, let's use is_kthread() here.
Signed-off-by: Mark Rutland <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Will Deacon <[email protected]>
---
arch/arm64/kernel/process.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 288012687c29..82b0a7a257cd 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -335,7 +335,7 @@ void arch_release_task_struct(struct task_struct *tsk)
*/
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
- if (current->mm)
+ if (!is_kthread(current))
fpsimd_preserve_current_state();
*dst = *src;
--
2.11.0
