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    Subject[PATCH 1/3] init: print some info about UUID and LABEL in name_to_dev_t()
    Date
    If there is no valid initrd, but root=UUID or root=LABEL is used
    in the command line, boot hangs like this:

    [ 5.739815] VFS: Cannot open root device "UUID=19957230-2e15-494c-8dfa-84aab3591961" or unknown-block(0,0): error -6
    [ 5.750280] Please append a correct "root=" boot option; here are the available partitions:
    [ 5.856059] 0800 125034840 sda
    [ 5.856061] driver: sd
    [ 5.862124] 0801 307200 sda1 d5077411-3d87-4f85-b312-8cc309ef9073
    [ 5.862128]
    [ 5.870603] 0802 1048576 sda2 aae0dd30-e5f5-44e1-994e-d47bf5ce2e52
    [ 5.870606]
    [ 5.879080] 0803 52428800 sda3 759079ee-85fa-4636-9de7-1ac0643ab87e
    [ 5.879083]
    [ 5.887558] 0804 8388608 sda4 439c4b0a-7b4f-4434-82f1-f9d380b55fb9
    [ 5.887560]
    [ 5.896035] 0805 62860288 sda5 ee52e951-1315-4fab-a3e5-45c6eeae6ce6
    [ 5.910575] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
    [ 5.918796] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---

    The above log is very useful, but some users still need time
    to analysis the cause [1, 2]. It is better to print some info
    to explicitly tell the users root=UUID or root=LABEL is not
    supported without initrd.

    [1] https://unix.stackexchange.com/questions/93767/why-cant-i-specify-my-root-fs-with-a-uuid
    [2] https://unix.stackexchange.com/questions/302795/how-to-identify-root-partition-via-uuid-without-initramfs-initrd

    Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
    ---
    init/do_mounts.c | 8 ++++++++
    1 file changed, 8 insertions(+)

    diff --git a/init/do_mounts.c b/init/do_mounts.c
    index 7058e14..2c1c492 100644
    --- a/init/do_mounts.c
    +++ b/init/do_mounts.c
    @@ -290,6 +290,14 @@ dev_t name_to_dev_t(const char *name)
    if (strncmp(name, "/dev/", 5) == 0)
    return devt_from_devname(name + 5);
    #endif
    + if (strncmp(name, "UUID=", 5) == 0) {
    + pr_info("root=UUID is not supported without initrd\n");
    + return 0;
    + }
    + if (strncmp(name, "LABEL=", 6) == 0) {
    + pr_info("root=LABEL is not supported without initrd\n");
    + return 0;
    + }
    return devt_from_devnum(name);
    }
    EXPORT_SYMBOL_GPL(name_to_dev_t);
    --
    2.1.0
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