Re: CONFIG_HIGHMEM & page_address: this time in ramfs.

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wollny wrote:
>
> static int ramfs_readpage(struct file *file, struct page * page)
> {
> if (!Page_Uptodate(page)) {
> - memset((void *) page_address(page), 0, PAGE_CACHE_SIZE);
> + memset((void *) kmap(page), 0, PAGE_CACHE_SIZE);
> SetPageUptodate(page);
> }
> UnlockPage(page);

You must also call kunmap(), otherwise you'll run out of kmap addresses
(only 512/1024 concurrent maps are possible)

Look at file_read_actor() in mm/filemap.c

--
	Manfred
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