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    SubjectRe: linux-next: Tree for Jan 20 -- Kernel panic - Unable to mount root fs
    On Tue, Jan 20, 2015 at 09:02:03PM +0000, Al Viro wrote:
    > On Tue, Jan 20, 2015 at 09:45:04PM +0100, Sabrina Dubroca wrote:
    >
    > > printk(KERN_ERR "fn_lookup %s %d\n", name, retval);
    > >
    > > and I get:
    > >
    > > [ 1.618558] fn_lookup bsg/0:0:0:0 -2
    > > [ 1.619437] fn_lookup bsg 0
    > > [ 1.620236] fn_lookup bsg/0:0:0:0 -2
    > > [ 1.625996] fn_lookup sda 0
    > > [ 1.626609] fn_lookup sda 0
    > > [ 1.639007] fn_lookup sda1 0
    > > [ 1.639691] fn_lookup sda1 0
    > > [ 1.643656] fn_lookup bsg/1:0:0:0 -2
    > > [ 1.644974] fn_lookup bsg 0
    > > [ 1.645928] fn_lookup bsg/1:0:0:0 -2
    > > [ 1.649483] fn_lookup /dev/ram -2
    > > [ 1.650424] fn_lookup /dev/root -2
    > > [ 1.651234] VFS: Cannot open root device "sda1" or unknown-block(8,1): error -2
    >
    > That -2 is -ENOENT... Wait a sec, what's in filename, filename->name and
    > what do you get from your printk on kernel with that commit reverted?

    On microblaze target:

    patch reverted:

    name . rv 0
    name usr rv 0
    name usr/lib rv 0
    name usr/share rv 0
    name usr/share/udhcpc rv 0
    name usr/bin rv 0
    name usr/bin/logger rv 0
    ...

    broken:

    filename c78a4000 filename->name c78a4014:. name . rv 0
    filename c78a4000 filename->name c78a4014:usr name usr rv 0
    filename c78a4000 filename->name c78a4014:usr/lib name usr/lib rv -2
    filename c78a4000 filename->name c78a4014:usr/share name usr/share rv -2
    filename c78a4000 filename->name c78a4014:usr/share/udhcpc name usr/share/udhcpc rv -2
    filename c78a4000 filename->name c78a4014:usr/bin name usr/bin rv -2
    filename c78ae000 filename->name c78ae014:usr/bin/logger name usr/bin/logger rv -2
    ...

    Guenter


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