pstore/blk: Fix kerndoc and redundancy on blkdev param

Remove redundant details of blkdev and fix up resulting kerndoc.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kees Cook <keescook@chromium.org>

Documentation/admin-guide/pstore-blk.rst

@@ -45,15 +45,18 @@ blkdev
 The block device to use. Most of the time, it is a partition of block device.
 It's required for pstore/blk. It is also used for MTD device.
 
-It accepts the following variants for block device:
+When pstore/blk is built as a module, "blkdev" accepts the following variants:
 
-1. <hex_major><hex_minor> device number in hexadecimal represents itself; no
-   leading 0x, for example b302.
-#. /dev/<disk_name> represents the device number of disk
+1. /dev/<disk_name> represents the device number of disk
 #. /dev/<disk_name><decimal> represents the device number of partition - device
    number of disk plus the partition number
 #. /dev/<disk_name>p<decimal> - same as the above; this form is used when disk
    name of partitioned disk ends with a digit.
+
+When pstore/blk is built into the kernel, "blkdev" accepts the following variants:
+
+#. <hex_major><hex_minor> device number in hexadecimal representation,
+   with no leading 0x, for example b302.
 #. PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF represents the unique id of
    a partition if the partition table provides it. The UUID may be either an
    EFI/GPT UUID, or refer to an MSDOS partition using the format SSSSSSSS-PP,

fs/pstore/blk.c

@@ -58,29 +58,7 @@ MODULE_PARM_DESC(best_effort, "use best effort to write (i.e. do not require sto
 
 /*
  * blkdev - the block device to use for pstore storage
- *
- * Usually, this will be a partition of a block device.
- *
- * blkdev accepts the following variants, when built as a module:
- * 1) /dev/<disk_name> represents the device number of disk
- * 2) /dev/<disk_name><decimal> represents the device number
- *    of partition - device number of disk plus the partition number
- * 3) /dev/<disk_name>p<decimal> - same as the above, that form is
- *    used when disk name of partitioned disk ends on a digit.
- *
- * blkdev accepts the following variants when built into the kernel:
- * 1) <hex_major><hex_minor> device number in hexadecimal representation,
- *    with no leading 0x, for example b302.
- * 2) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
- *    unique id of a partition if the partition table provides it.
- *    The UUID may be either an EFI/GPT UUID, or refer to an MSDOS
- *    partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero-
- *    filled hex representation of the 32-bit "NT disk signature", and PP
- *    is a zero-filled hex representation of the 1-based partition number.
- * 3) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to
- *    a partition with a known unique id.
- * 4) <major>:<minor> major and minor number of the device separated by
- *    a colon.
+ * See Documentation/admin-guide/pstore-blk.rst for details.
  */
 static char blkdev[80] = CONFIG_PSTORE_BLK_BLKDEV;
 module_param_string(blkdev, blkdev, 80, 0400);