[PATCH] cleanup of ipc/msg.c

[Manfred Spraul]

Hi,

Attached is a cleanup of the main loops in sys_msgrcv and sys_msgsnd, 
based on ipc_lock_by_ptr(). Most backward gotos are gone, instead normal 
"for(;;)" loops until a suitable message is found.

Additionally, the patch
- reintroduces lockless receive, same implementation as in ipc/mqueue.c.
- fixes a rare BUG(): if queue settings are changed with 
msgctl(,IPC_SET,) while a thread is sleeping in msgrcv() and the queue 
is then destroyed with msgctl(,IPC_RMID,) before the sleeping thread 
noticed the new configuration, then the BUG() is line 764 would trigger.

Andrew, could you add it to -mm? If it's too large then I'll split out 
the bugfix, it's a oneliner [remove the BUG()].

Signed-Off-By: Manfred Spraul <manfred@xxxxxxxxxxxxxxxx>
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