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frv: update comment in scatterlist to reflect new setup 

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2007-10-23 12:39:41 +02:00
parent 26da107848
commit d09d276ebf
1 changed files with 4 additions and 4 deletions
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8
include/asm-frv/scatterlist.h
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@ -4,19 +4,19 @@
#include <asm/types.h>
/*
* Drivers must set either ->address or (preferred) ->page and ->offset
* Drivers must set either ->address or (preferred) page and ->offset
* to indicate where data must be transferred to/from.
*
* Using ->page is recommended since it handles highmem data as well as
* Using page is recommended since it handles highmem data as well as
* low mem. ->address is restricted to data which has a virtual mapping, and
* it will go away in the future. Updating to ->page can be automated very
* it will go away in the future. Updating to page can be automated very
* easily -- something like
*
* sg->address = some_ptr;
*
* can be rewritten as
*
* sg->page = virt_to_page(some_ptr);
* sg_set_page(virt_to_page(some_ptr));
* sg->offset = (unsigned long) some_ptr & ~PAGE_MASK;
*
* and that's it. There's no excuse for not highmem enabling YOUR driver. /jens