Yunsheng Lin 8b5536ad12
lockdep: Introduce in_softirq lockdep assert ...
The current semantic for napi_consume_skb() is that caller need
to provide non-zero budget when calling from NAPI context, and
breaking this semantic will cause hard to debug problem, because
_kfree_skb_defer() need to run in atomic context in order to push
the skb to the particular cpu' napi_alloc_cache atomically.
So add the lockdep_assert_in_softirq() to assert when the running
context is not in_softirq, in_softirq means softirq is serving or
BH is disabled, which has a ambiguous semantics due to the BH
disabled confusion, so add a comment to emphasize that.
And the softirq context can be interrupted by hard IRQ or NMI
context, lockdep_assert_in_softirq() need to assert about hard
IRQ or NMI context too.
Suggested-by: Jakub Kicinski <kuba@kernel.org >
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com >
Signed-off-by: Jakub Kicinski <kuba@kernel.org >
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Yunsheng Lin
8b5536ad12