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UIO: Add alignment warnings for uio-mem 

This patch adds an "offset" attribute for UIO mappings. It shows the
difference between the actual start address of the memory and the start
address of the page.

Signed-off-by: Hans J. Koch <hjk@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Hans J. Koch 2008-09-18 23:53:18 +02:00 committed by Greg Kroah-Hartman
parent 99178b036c
commit e2b39df119
1 changed files with 8 additions and 0 deletions
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8
drivers/uio/uio.c
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@ -67,6 +67,11 @@ static ssize_t map_size_show(struct uio_mem *mem, char *buf)
return sprintf(buf, "0x%lx\n", mem->size);
}
static ssize_t map_offset_show(struct uio_mem *mem, char *buf)
{
return sprintf(buf, "0x%lx\n", mem->addr & ~PAGE_MASK);
}
struct uio_sysfs_entry {
struct attribute attr;
ssize_t (*show)(struct uio_mem *, char *);
@ -77,10 +82,13 @@ static struct uio_sysfs_entry addr_attribute =
__ATTR(addr, S_IRUGO, map_addr_show, NULL);
static struct uio_sysfs_entry size_attribute =
__ATTR(size, S_IRUGO, map_size_show, NULL);
static struct uio_sysfs_entry offset_attribute =
__ATTR(offset, S_IRUGO, map_offset_show, NULL);
static struct attribute *attrs[] = {
&addr_attribute.attr,
&size_attribute.attr,
&offset_attribute.attr,
NULL, /* need to NULL terminate the list of attributes */
};