[parisc-linux] gcc-3.[02] alignment problem

[Randolph Chung]

In reference to a message from John David Anglin, dated Jul 16:
> > These messages are coming from the assembler (remove "-pipe").  The
> > first is from "std %r4,44(%r3)".  The offset "44" is not correct for
> > a store double.  This is probably a problem with pointer arithmetic
> > in the source.
> 
> Check the definition of RTA_ALIGNTO in linux/rtnetlink.h.

ah, this is not it, but i see what it is now.

include/linux/tcp_diag.h defines:

struct tcpdiag_sockid
{
        __u16   tcpdiag_sport;
        __u16   tcpdiag_dport;
        __u32   tcpdiag_src[4];
        __u32   tcpdiag_dst[4];
        __u32   tcpdiag_if;
        __u32   tcpdiag_cookie[2]; 
#define TCPDIAG_NOCOOKIE (~0U)
};

the code goes on to do:
        *((struct sock **)&r->id.tcpdiag_cookie) = sk;
and
            sk != *((struct sock **)&req->id.tcpdiag_cookie[0]))

even tho tcpdiag_cookie looks like it can be 64-bit aligned in the
struct, it appears that it isn't.... 

the "vomit grade hack" alan mentioned in another post is that in our
tree, we have:

struct tcpdiag_sockid
{
        __u16   tcpdiag_sport;
        __u16   tcpdiag_dport;
        __u32   tcpdiag_src[4];
        __u32   tcpdiag_dst[4];
        __u32   tcpdiag_if;
#if defined (__hppa__) && defined (__LP64__)
        char * parisc_hack_to_align_tcpdiag_cookie;
#endif
        __u32   tcpdiag_cookie[2];
#define TCPDIAG_NOCOOKIE (~0U)
};

why is the offset of tcpdiag_cookie[0] 44 and not 40?

randolph
--  
Randolph Chung
Debian GNU/Linux Developer, hppa/ia64 ports
http://www.tausq.org/