Messages in this thread | | | Subject | Re: [RFC PATCH v3 08/12] net: support non paged skb frags | From | Yunsheng Lin <> | Date | Wed, 8 Nov 2023 19:25:16 +0800 |
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On 2023/11/8 5:19, Mina Almasry wrote: >> >> > > My personal immediate reaction is that this may just introduce code > churn without significant benefit. If an unsuspecting caller call > skb_frag_page() on devmem frag and doesn't correctly handle NULL > return, it will crash or error out anyway, and likely in some obvious > way, so maybe the BUG_ON() isn't so useful that it's worth changing
If it will always crash or error out, then I agree that BUG_ON() is unnecessary.
> all the call sites. But if there is consensus on adding a change like > you propose, I have no problem adding it.
One obvious benefit I forget to mention is that, it provides a better semantic that if a caller need to do the return checking: 1. For the old helper, the semantic is not to do the checking if the caller has ensure that it has passed a readable frag to skb_frag_page(), which avoid adding some overhead for non-devmen supported drivers. 2. For the new helper, the semantic is to do the checking and we may provide a compiler '__must_check' function-attribute to ensure the caller to do the checking.
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