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UBI: document UBI_IOCVOLUP better in user header 

The current ioctl define implies that this func expects to be passed a
64bit number directly rather than a pointer to a 64bit.  The code that
processes this ioctl shows that it clearly expects a pointer.

It'd be best if we could change the type to "__s64*", but that would
change the generated ioctl number thus breaking the userland ABI.  So
just add a comment for intrepid developers.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
This commit is contained in:
Mike Frysinger 2013-05-01 23:42:47 -04:00 committed by Artem Bityutskiy
parent 1557b9e1cb
commit 95f9a4d27e
1 changed files with 4 additions and 1 deletions
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5
include/uapi/mtd/ubi-user.h
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@ -173,7 +173,10 @@
#define UBI_VOL_IOC_MAGIC 'O'
/* Start UBI volume update */
/* Start UBI volume update
* Note: This actually takes a pointer (__s64*), but we can't change
* that without breaking the ABI on 32bit systems
*/
#define UBI_IOCVOLUP _IOW(UBI_VOL_IOC_MAGIC, 0, __s64)
/* LEB erasure command, used for debugging, disabled by default */
#define UBI_IOCEBER _IOW(UBI_VOL_IOC_MAGIC, 1, __s32)