printk failed in cpu bus/cache error

To:	Linux MIPS Mailing List <linux-mips@linux-mips.org>
Subject:	printk failed in cpu bus/cache error
From:	"wilbur.chan" <wilbur512@gmail.com>
Date:	Fri, 12 Nov 2010 23:19:14 +0800
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linux 2.6.21.7

mips  xlr 732 configured  with 32bits system


I found that when an cpu/cache error was triggered  by an  unaligned
access , printk does not  work well in the cache error handler.


printk hangs on  spin_lock(&logbuf_lock),    further more ,  the code
was  located exactly  to :

spin_lock -- > _raw_spin_trylock -->asm( " sc   %2, %1"  )
include/asm-mips/spinlock.h



If    ' sc ' instruction  unavailable when cache error occured?

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