net-zerocopy: Fast return if inq < PAGE_SIZE

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Sometimes, we may call tcp receive zerocopy when inq is 0,
or inq < PAGE_SIZE, in which case we cannot remap pages. In this case,
simply return the appropriate hint for regular copying without taking
mmap_sem.

Signed-off-by: Arjun Roy <arjunroy@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Arjun Roy 2020-12-02 14:53:46 -08:00 • committed by Jakub Kicinski

parent 98917cf0d6

commit 936ced4157

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net/ipv4/tcp.c

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