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Arnaldo Carvalho de Melo 850db6b8c5 [INET_CONNECTION_SOCK]: Pack struct inet_connection_sock_af_ops 
We have a hole in:

[acme@newtoy net-2.6.20]$ pahole net/ipv6/tcp_ipv6.o inet_connection_sock_af_ops
/* /pub/scm/linux/kernel/git/acme/net-2.6.20/include/net/inet_connection_sock.h:38 */
struct inet_connection_sock_af_ops {
        int                        (*queue_xmit)();      /*     0     4 */
        void                       (*send_check)();      /*     4     4 */
        int                        (*rebuild_header)();  /*     8     4 */
        int                        (*conn_request)();    /*    12     4 */
        struct sock *              (*syn_recv_sock)();   /*    16     4 */
        int                        (*remember_stamp)();  /*    20     4 */
        __u16                      net_header_len;       /*    24     2 */

        /* XXX 2 bytes hole, try to pack */

        int                        (*setsockopt)();      /*    28     4 */
        int                        (*getsockopt)();      /*    32     4 */
        int                        (*compat_setsockopt)(); /*    36     4 */
        int                        (*compat_getsockopt)(); /*    40     4 */
        void                       (*addr2sockaddr)();   /*    44     4 */
        int                        sockaddr_len;         /*    48     4 */
}; /* size: 52, sum members: 50, holes: 1, sum holes: 2 */

But we don't need sockaddr_len to be an int:

[acme@newtoy net-2.6.20]$ find net -name "*.[ch]" | xargs grep '\.sockaddr_len.\+=' | sort -u
net/dccp/ipv4.c:        .sockaddr_len      = sizeof(struct sockaddr_in),
net/dccp/ipv6.c:        .sockaddr_len      = sizeof(struct sockaddr_in6),
net/ipv4/tcp_ipv4.c:    .sockaddr_len      = sizeof(struct sockaddr_in),
net/ipv6/tcp_ipv6.c:    .sockaddr_len      = sizeof(struct sockaddr_in6),
net/sctp/ipv6.c:        .sockaddr_len      = sizeof(struct sockaddr_in6),
net/sctp/protocol.c:    .sockaddr_len      = sizeof(struct sockaddr_in),

[acme@newtoy net-2.6.20]$ pahole --sizes net/ipv6/tcp_ipv6.o | grep sockaddr_in
struct sockaddr_in: 16 0
struct sockaddr_in6: 28 0
[acme@newtoy net-2.6.20]$

So I turned sockaddr_len a 'u16', and now:

[acme@newtoy net-2.6.20]$ pahole net/ipv6/tcp_ipv6.o inet_connection_sock_af_ops
/* /pub/scm/linux/kernel/git/acme/net-2.6.20/include/net/inet_connection_sock.h:38 */
struct inet_connection_sock_af_ops {
        int            (*queue_xmit)();        /*     0   4 */
        void           (*send_check)();        /*     4   4 */
        int            (*rebuild_header)();    /*     8   4 */
        int            (*conn_request)();      /*    12   4 */
        struct sock *  (*syn_recv_sock)();     /*    16   4 */
        int            (*remember_stamp)();    /*    20   4 */
        u16            net_header_len;         /*    24   2 */
        u16            sockaddr_len;           /*    26   2 */
        int            (*setsockopt)();        /*    28   4 */
        int            (*getsockopt)();        /*    32   4 */
        int            (*compat_setsockopt)(); /*    36   4 */
        int            (*compat_getsockopt)(); /*    40   4 */
        void           (*addr2sockaddr)();     /*    44   4 */
}; /* size: 48 */

So we've saved 4 bytes:

[acme@newtoy net-2.6.20]$ codiff -sV /tmp/tcp_ipv6.o.before net/ipv6/tcp_ipv6.o
/pub/scm/linux/kernel/git/acme/net-2.6.20/net/ipv6/tcp_ipv6.c:
  struct inet_connection_sock_af_ops |   -4
    net_header_len;
     from: __u16                 /*    24(0)     2(0) */
     to:   u16                   /*    24(0)     2(0) */
    sockaddr_len;
     from: int                   /*    48(0)     4(0) */
     to:   u16                   /*    26(0)     2(0) */
 1 struct changed
[acme@newtoy net-2.6.20]$

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2006-12-02 21:30:46 -08:00
..
acpi ACPI: Change ACPI to use dev_archdata instead of firmware_data 2006-12-01 14:52:01 -08:00
asm-alpha [NET]: Alpha checksum annotations and cleanups. 2006-12-02 21:23:01 -08:00
asm-arm [NET]: ARM checksum annotations and cleanups. 2006-12-02 21:23:15 -08:00
asm-arm26 [NET]: ARM26 checksum annotations and cleanups. 2006-12-02 21:23:16 -08:00
asm-avr32 [NET]: AVR32 checksum annotations and cleanups. 2006-12-02 21:23:18 -08:00
asm-cris [NET]: Cris checksum annotations and cleanups. 2006-12-02 21:23:02 -08:00
asm-frv [NET]: FRV checksum annotations. 2006-12-02 21:23:03 -08:00
asm-generic Driver core: add dev_archdata to struct device 2006-12-01 14:52:01 -08:00
asm-h8300 [NET]: H8300 checksum annotations and cleanups. 2006-12-02 21:23:04 -08:00
asm-i386 [NET]: I386 checksum annotations and cleanups. 2006-12-02 21:23:19 -08:00
asm-ia64 [NET]: IA64 checksum annotations and cleanups. 2006-12-02 21:23:05 -08:00
asm-m32r [NET]: M32R checksum annotations and cleanups. 2006-12-02 21:23:06 -08:00
asm-m68k [NET]: M68K checksum annotations and cleanups. 2006-12-02 21:23:07 -08:00
asm-m68knommu [NET]: M68Knommu checksum annotations and cleanups. 2006-12-02 21:23:08 -08:00
asm-mips [NET]: MIPS checksum annotations and cleanups. 2006-12-02 21:23:09 -08:00
asm-parisc [NET]: PARISC checksum annotations and cleanups. 2006-12-02 21:23:10 -08:00
asm-powerpc [NET]: POWERPC checksum annotations and cleanups. 2006-12-02 21:23:20 -08:00
asm-ppc Driver core: add dev_archdata to struct device 2006-12-01 14:52:01 -08:00
asm-s390 [NET]: S390 checksum annotations and cleanups. 2006-12-02 21:23:21 -08:00
asm-sh [NET]: SH checksum annotations and cleanups. 2006-12-02 21:23:22 -08:00
asm-sh64 [NET]: SH64 checksum annotations and cleanups. 2006-12-02 21:23:11 -08:00
asm-sparc [NET]: SPARC checksum annotations and cleanups. 2006-12-02 21:23:22 -08:00
asm-sparc64 [NET]: SPARC64 checksum annotations and cleanups. 2006-12-02 21:23:23 -08:00
asm-um Driver core: add dev_archdata to struct device 2006-12-01 14:52:01 -08:00
asm-v850 [NET]: V850 checksum annotations and cleanups. 2006-12-02 21:23:13 -08:00
asm-x86_64 [NET]: X86_64 checksum annotations and cleanups. 2006-12-02 21:23:14 -08:00
asm-xtensa [NET]: XTENSA checksum annotations and cleanups. 2006-12-02 21:23:24 -08:00
crypto [CRYPTO] digest: Added user API for new hash type 2006-09-21 11:46:17 +10:00
keys
linux [RTNETLINK]: Add rtnl_put_cacheinfo() to unify some code 2006-12-02 21:30:44 -08:00
math-emu
media V4L/DVB (4666): Ensure the WM8775 driver is loaded generically for any board. 2006-10-03 15:13:48 -03:00
mtd Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 2006-10-01 17:55:53 +01:00
net [INET_CONNECTION_SOCK]: Pack struct inet_connection_sock_af_ops 2006-12-02 21:30:46 -08:00
pcmcia
rdma IB/cm: Fix automatic path migration support 2006-11-29 15:33:10 -08:00
rxrpc
scsi [PATCH] add missing libsas include to fix s390 compilation. 2006-11-28 17:26:50 -08:00
sound Driver core: convert sound core to use struct device 2006-12-01 14:52:01 -08:00
video fix file specification in comments 2006-10-03 23:01:26 +02:00
Kbuild [HEADERS] One line per header in Kbuild files to reduce conflicts 2006-09-19 12:43:58 +01:00