From 2bd30b8dc75b823dd7bbef9d7bc68e1fd7ecee5c Mon Sep 17 00:00:00 2001 From: Sang-Heon Jeon Date: Mon, 24 Aug 2026 01:18:14 +0900 Subject: coccinelle: alloc_cast: drop removed allocators - pci_alloc_consistent() and pci_zalloc_consistent() were removed by commit 7968778914e5 ("PCI: Remove the deprecated "pci-dma-compat.h" API") - kmem_alloc() was removed by commit f078d4ea8276 ("xfs: convert kmem_alloc() to kmalloc()") - kmem_zalloc() was removed by commit 10634530f7ba ("xfs: convert kmem_zalloc() to kzalloc()") - kmem_zone_alloc() and kmem_zone_zalloc() were removed by commit bae633a4a283 ("xfs: remove xfs_zone_{alloc,zalloc} helpers") So drop them from the rules. No functional change. Signed-off-by: Sang-Heon Jeon Signed-off-by: Julia Lawall --- Documentation/networking/tc-actions-env-rules.rst | 29 +++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 Documentation/networking/tc-actions-env-rules.rst (limited to 'Documentation/networking/tc-actions-env-rules.rst') diff --git a/Documentation/networking/tc-actions-env-rules.rst b/Documentation/networking/tc-actions-env-rules.rst new file mode 100644 index 000000000..86884b8fb --- /dev/null +++ b/Documentation/networking/tc-actions-env-rules.rst @@ -0,0 +1,29 @@ +.. SPDX-License-Identifier: GPL-2.0 + +================================ +TC Actions - Environmental Rules +================================ + + +The "environmental" rules for authors of any new tc actions are: + +1) If you stealeth or borroweth any packet thou shalt be branching + from the righteous path and thou shalt cloneth. + + For example if your action queues a packet to be processed later, + or intentionally branches by redirecting a packet, then you need to + clone the packet. + +2) If you munge any packet thou shalt call pskb_expand_head in the case + someone else is referencing the skb. After that you "own" the skb. + +3) Dropping packets you don't own is a no-no. You simply return + TC_ACT_SHOT to the caller and they will drop it. + +The "environmental" rules for callers of actions (qdiscs etc) are: + +#) Thou art responsible for freeing anything returned as being + TC_ACT_SHOT/STOLEN/QUEUED. If none of TC_ACT_SHOT/STOLEN/QUEUED is + returned, then all is great and you don't need to do anything. + +Post on netdev if something is unclear. -- cgit v1.3.1