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Commit e2b39df1 authored by Hans J. Koch's avatar Hans J. Koch Committed by Greg Kroah-Hartman
Browse files

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: default avatarHans J. Koch <hjk@linutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 99178b03

drivers/uio/uio.c

+8 −0
Original line number Diff line number Diff line
@@ -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 */

};