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    SubjectRe: [PATCH 7/7] driver-core : convert semaphore to mutex in struct class
    On Thu, Jan 17, 2008 at 09:31:55PM +0100, Jarek Poplawski wrote:
    > On Thu, Jan 17, 2008 at 02:57:36PM -0500, Alan Stern wrote:
    ...
    > > If I recall correctly the nature of the warning was that a method
    > > routine for one class (called with the class's mutex held) was creating
    > > a second class and locking that class's mutex. In principle this is
    > > perfectly legal and should be allowed for arbitrary depths of nesting,
    > > even though it is the sort of thing lockdep is currently unable to
    > > handle.

    BTW, Dave, if it's only about one such "second class" here, then it
    shouldn't be so hard to try this one more level of nesting. I think,
    the real problem for lockdep starts when there are more such "second
    classes", but it's probably in another place.

    You could also have a look at e.g. enum_inode_i_mutex_lock_class in
    include/linux/fs.h and fh_lock_nested() in include/linux/nfsd/nfsfh.h,
    and maybe define similar enum for this.

    Jarek P.


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