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H A D | skbuff.c | a4650da2 Fri Jan 13 07:51:59 CST 2023 Jesper Dangaard Brouer <brouer@redhat.com> net: fix call location in kfree_skb_list_reason
The SKB drop reason uses __builtin_return_address(0) to give the call "location" to trace_kfree_skb() tracepoint skb:kfree_skb.
To keep this stable for compilers kfree_skb_reason() is annotated with __fix_address (noinline __noclone) as fixed in commit c205cc7534a9 ("net: skb: prevent the split of kfree_skb_reason() by gcc").
The function kfree_skb_list_reason() invoke kfree_skb_reason(), which cause the __builtin_return_address(0) "location" to report the unexpected address of kfree_skb_list_reason.
Example output from 'perf script': kpktgend_0 1337 [000] 81.002597: skb:kfree_skb: skbaddr=0xffff888144824700 protocol=2048 location=kfree_skb_list_reason+0x1e reason: QDISC_DROP
Patch creates an __always_inline __kfree_skb_reason() helper call that is called from both kfree_skb_list() and kfree_skb_list_reason(). Suggestions for solutions that shares code better are welcome.
As preparation for next patch move __kfree_skb() invocation out of this helper function.
Reviewed-by: Saeed Mahameed <saeed@kernel.org> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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