Re: [PATCH] tcp: fix tcp_fastopen unaligned access complaints on sparc

[David Miller]

From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Date: Thu, 12 Jan 2017 12:25:33 -0800

> On Thu, 2017-01-12 at 13:15 -0700, Rob Gardner wrote:
> 
>> 
>> I suspect that someplace, somebody is casting val to an int * or 
>> something like that.
> 
> Then that would be the bug. Can we root cause this please ?

The three accesses to foc->val are via function calls, at least when I
try to build it, one via memcmp(), one via memcpy() (for the structure
assignment at the end of the function) and one via a call into the
crypto layer when we do tcp_fastopen_cookie_gen).

So if the PC is inside of tcp_try_fastopen() it has to be something
else, or something specific to your gcc and build.