From e2b39df119712ea5184562a6a14696a5cea8ef18 Mon Sep 17 00:00:00 2001 From: "Hans J. Koch" Date: Thu, 18 Sep 2008 23:53:18 +0200 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/uio/uio.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 9ac22c7c3854..557e73ef5884 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -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 */ }; -- 2.20.1