Re: How to map high memory for block io

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Fri, Jan 27, 2006 at 10:58:59PM +0100, Pierre Ossman wrote:
> Test done here, few minutes ago. Added this to the wbsd driver in its
> kmap routine:
> 
>     if ((host->cur_sg->offset + host->cur_sg->length) > PAGE_SIZE)
>         printk(KERN_DEBUG "wbsd: Big sg: %d, %d\n",
>             host->cur_sg->offset, host->cur_sg->length);
> 
> got:
> 
> [17385.425389] wbsd: Big sg: 0, 8192
> [17385.436849] wbsd: Big sg: 0, 7168
> [17385.436859] wbsd: Big sg: 0, 7168
> [17385.454029] wbsd: Big sg: 2560, 5632
> [17385.454216] wbsd: Big sg: 2560, 5632

Jens - what's going on?  These look like invalid sg entries to me.

If they are supposed to be like that, there will be additional problems
for block drivers ensuring cache coherency on PIO.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core
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