David Miller a écrit :

From: Eric Dumazet <redacted>
Date: Sat, 29 Mar 2008 09:18:03 +0100

quoted

BTW, can loopback_xmit() be called on an interrupt stack ?

Absolutely, softirq processes TCP data, ACK goes out in
softirq context.

yes, ICMP messages (if any are sent) too.

Softirqs run on interrupt stacks just as hardirqs do.

Well, it depends.

Not on x86_32 with 8K stacks, and some other arches.
do_softirq() can use the underlying stack too.

Thank you