UIO: Add alignment warnings for uio-mem (e2b39df1) · Commits · 戴 / test

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 −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 */
		};

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