RE: [Xen-devel] Badness in local_bh_enable

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

 > nic@stateless:~$ strings 
> /lib/modules/2.6.10-xen0/kernel/net/rxrpc/rxrpc.ko | grep vermagic=
> vermagic=2.6.10-xen0 preempt PENTIUM4 gcc-3.3 
> 
> These seems to be compiled with ARCH=xen.

Not necessarily. You may have used that -xen0 tree, but not specified
ARCH=xen. There's no way to tell :-(

> nic@stateless:~$ strings 
> /lib/modules/2.6.10-xenU/kernel/net/ipv4/netfilter/ipt_REJECT.
> ko | grep vermagic=
> vermagic=2.6.10-xenU preempt PENTIUM4 gcc-3.3
> nic@stateless:~$ objdump -d 
> /lib/modules/2.6.10-xenU/kernel/net/ipv4/netfilter/ipt_REJECT.
> ko | egrep  -e sti
>  b3f:   fb                      sti

Just finding a cli/sti in the disassembled output does not necessarily
indicate a problem -- objdump frequently gets confused and disassembles
things that are data, particularly after an undefined instruction e.g.
the uda2 used for BUG messages.

You'll need to look at the instructions around the cli/sti to determine
whether they're real or not.

Ian

> nic@stateless:~$ strings 
> /lib/modules/2.6.10-xenU/kernel/net/rxrpc/rxrpc.ko | grep vermagic=
> vermagic=2.6.10-xenU preempt PENTIUM4 gcc-3.3
> nic@stateless:~$ objdump -d 
> /lib/modules/2.6.10-xenU/kernel/net/rxrpc/rxrpc.ko | egrep  -e sti
>     1f94:       fb                      sti
> 
> 
> find /lib/modules/2.6.10-xenU -name \*.ko -exec 
> /tmp/version-check  {}  \;
> nic@stateless:~$ cat /tmp/version-check
> #!/bin/bash
> 
> strings $1 | grep vermagic= | grep -v 'xenU'
> objdump -d $1 | perl -n -e 'print $_ if /\scli/'
> objdump -d $1 | perl -n -e 'print $_ if /\ssti/'
> 
> 
> Nicholas
> 


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