Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 43/46] UIO: Add alignment warnings for uio-mem | Date | Thu, 16 Oct 2008 10:10:44 -0700 |
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From: Hans J. Koch <hjk@linutronix.de>
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> --- drivers/uio/uio.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 9ac22c7..557e73e 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 */ }; -- 1.6.0.2
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