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SubjectRe: Another idea for simplifying locking in kernel/module.c
Rusty Russell wrote:
>In message <200301070219.SAA12905@adam.yggdrasil.com> you write:
>> Here is a way to replace all of the specialized "stop CPU"
>> locking code in kernel/module.c with an rw_semaphore by using
>> down_read_trylock in try_module_get() and down_write when beginning to
>> unload the module.

>And now you can't modularize netfilter modules.

Why not? Last time you went looking in the networking code
for an example of something that had to increment a module reference
in a context where blocking was not allowed you ended up conceding
that you example was incorrect. If you've now found an example,
please let me know.

I just booted my gateway machine to a kernel using my
aforemetioned patch and various netfilter modules. I've surfed the
web, FTP'ed file and run irc through it. It seems to be okay.
Here is the lsmod listing from it.

Module Size Used by
iptable_nat 28324 1 [unsafe],
ip_conntrack 39788 2 iptable_nat,[unsafe],
ext2 60712 0 -
pcmcia_core 55744 0 -
i810 65816 0 -
atkbd 6820 0 -
i8042 8864 0 -
serio 4564 2 atkbd,i8042,
autofs 14992 1 -
ipt_TCPMSS 3568 1 [unsafe],
iptable_filter 2272 1 [unsafe],
ip_tables 17296 8 iptable_nat,ipt_TCPMSS,iptable_filter,[unsafe],
nfsd 111824 1 [unsafe],
exportfs 6160 1 nfsd,
nfs 132092 0 -
lockd 58736 3 nfsd,nfs,[unsafe],
sunrpc 114136 4 nfsd,nfs,lockd,[unsafe],
pppoe 14336 1 [unsafe],
pppox 3480 1 pppoe,
af_packet 20760 2 [unsafe],
ppp_async 11296 0 -
ppp_generic 30264 5 pppoe,pppox,ppp_async,
slhc 6576 1 ppp_generic,
ipv4 392804 88 iptable_nat,ip_conntrack,sunrpc,af_packet,[unsafe],
unix 23884 11 [unsafe],
sis_agp 4224 0 -
agpgart 23248 2 sis_agp,
ohci_hcd 28400 0 -
usbcore 101108 3 ohci_hcd,
ac97_codec 12432 0 -
sis900 16548 0 -
tulip 52960 2 [unsafe],
crc32 4272 2 sis900,tulip,
ext3 112232 3 -
jbd 65840 1 ext3,
mbcache 7764 2 ext2,ext3,
ide_disk 17332 5 -
ide_mod 143684 1 ide_disk,[unsafe],


Adam J. Richter __ ______________ 575 Oroville Road
adam@yggdrasil.com \ / Milpitas, California 95035
+1 408 309-6081 | g g d r a s i l United States of America
"Free Software For The Rest Of Us."
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