linux-ext4 - Re: [PATCH][RFC]JBD2: Fix journal checksum kernel oops on NUMA

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Date:	Fri, 2 Nov 2007 13:20:31 +0800
From:	Andreas Dilger <adilger@....com>
To:	Mingming Cao <cmm@...ibm.com>
Cc:	Girish Shilamkar <girish@...sterfs.com>,
	Avantika Mathur <mathur@...ux.vnet.ibm.com>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH][RFC]JBD2: Fix journal checksum kernel oops on NUMA

On Nov 01, 2007  17:40 -0700, Mingming Cao wrote:
> Current journal checksumming patch failed fsstress test on NUMA. The 
> bh->b_data passed to the crc32_be () function could be NULL pointer, 
> which caused kernel oops immediately when running fsstress with -o 
> journal_checksum. It is because the page is part of highmem on NUMA box.
> We need to kmap the page before access the bh->b_data to calculate
> the checksums.

I have no objection to the patch, per-se, but I'm surprised that there
would ever be a buffer head pointing at a page in high memory?  That
seems contrary to what I would expect...

Cheers, Andreas
--
Andreas Dilger
Sr. Software Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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