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-rw-r--r--include/mtd/ubi-user.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/mtd/ubi-user.h b/include/mtd/ubi-user.h
index 53cae1e11e57..723c324590c1 100644
--- a/include/mtd/ubi-user.h
+++ b/include/mtd/ubi-user.h
@@ -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)