From: Eric Dumazet <edumazet@google.com>
Date: Thu, 23 Oct 2014 19:58:58 +0000 (-0700)
Subject: tcp: md5: do not use alloc_percpu()
X-Git-Tag: v3.2.66~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=724035313906d1569c81524132ef494ce1a112af;p=pandora-kernel.git

tcp: md5: do not use alloc_percpu()

commit 349ce993ac706869d553a1816426d3a4bfda02b1 upstream.

percpu tcp_md5sig_pool contains memory blobs that ultimately
go through sg_set_buf().

-> sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));

This requires that whole area is in a physically contiguous portion
of memory. And that @buf is not backed by vmalloc().

Given that alloc_percpu() can use vmalloc() areas, this does not
fit the requirements.

Replace alloc_percpu() by a static DEFINE_PER_CPU() as tcp_md5sig_pool
is small anyway, there is no gain to dynamically allocate it.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: 765cf9976e93 ("tcp: md5: remove one indirection level in tcp_md5sig_pool")
Reported-by: Crestez Dan Leonard <cdleonard@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.2: the deleted code differs slightly due to API changes]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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