The memory allocator is fully preemptible and therefore cannot
be invoked from truly atomic contexts.
See Documentation/locking/locktypes.rst (line: 470)
Add raw_spin_unlock() before memory allocation and raw_spin_lock()
after it.
Signed-off-by: Yajun Deng <yajun.deng@xxxxxxxxx>
---
arch/x86/kernel/kvm.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index d0bb2b3fb305..8f8ec9bbd847 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -205,7 +205,9 @@ void kvm_async_pf_task_wake(u32 token)
* async PF was not yet handled.
* Add dummy entry for the token.
*/
- n = kzalloc(sizeof(*n), GFP_ATOMIC);
+ raw_spin_unlock(&b->lock);
+ n = kzalloc(sizeof(*n), GFP_KERNEL);
+ raw_spin_lock(&b->lock);
if (!n) {
/*
* Allocation failed! Busy wait while other cpu
--
2.25.1
