route: fix breakage after moving lwtunnel state

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__recnt and related fields need to be in its own cacheline for performance
reasons. Commit 61adedf3e3 ("route: move lwtunnel state to dst_entry")
broke that on 32bit archs, causing BUILD_BUG_ON in dst_hold to be triggered.

This patch fixes the breakage by moving the lwtunnel state to the end of
dst_entry on 32bit archs. Unfortunately, this makes it share the cacheline
with __refcnt and may affect performance, thus further patches may be
needed.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Fixes: 61adedf3e3 ("route: move lwtunnel state to dst_entry")
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Jiri Benc 2015-08-21 12:41:14 +02:00 • committed by David S. Miller

parent 31fbde9967

commit 751a587ac9

1 changed files with 5 additions and 2 deletions

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7

include/net/dst.h

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