On Apr 6, 2005, at 1:04 AM, Arjan van de Ven wrote:
On Tue, 2005-04-05 at 16:47 -0700, Can Sar wrote:Hi,
I've instrumented the mark_buffer_dirty routine of the kernel to print the address that b_data points to for a simple block device driver I got from http://lwn.net/Articles/58720/. I get perfectly valid addresses most of the time, except that sometimes the pointer has the value of 0x400. I have been looking at this for a very long time and I have no idea what could be causing this? Does anyone have any ideas?
if the page is in highmem b_data doesn't mean what you think it means. In fact I would argue that anyone using b_data is buggy....
That was my initial thought, but on the other hand, the machine in question only has 256 MB of RAM. IS that irrelevant? What would I have to do to fix this?
Thanks, Can
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