Re: [PATCH 1/2] freezer: add unsafe versions of freezable helpers

[Pavel Machek]

Hi!

> >> NFS calls the freezable helpers with locks held, which is unsafe
> >> and caused lockdep warnings when 6aa9707 "lockdep: check that no
> >> locks held at freeze time" was applied (reverted in dbf520a).
> >> Add new *_unsafe versions of the helpers that will not run the
> >> lockdep test when 6aa9707 is reapplied, and call them from NFS.
> >>
> >> Signed-off-by: Colin Cross <ccross@xxxxxxxxxxx>
> >
> > Looks mostly good.
> >
> >> @@ -152,6 +169,14 @@ static inline bool freezer_should_skip(struct task_struct *p)
> >>       freezer_count();                                                \
> >>  })
> >>
> >> +/* DO NOT ADD ANY NEW CALLERS OF THIS FUNCTION */
> >> +#define freezable_schedule_unsafe()                                  \
> >> +({                                                                   \
> >> +     freezer_do_not_count();                                         \
> >> +     schedule();                                                     \
> >> +     freezer_count_unsafe();                                         \
> >> +})
> >> +
> >
> > Make it inline function? :-). Add short explanation why it is good
> > idea?
> 
> These are exact copies of the existing non-unsafe versions, except
> they call freezer_count_unsafe() instead of freezer_count().  The next
> version of my other patch stack that goes on top of this has a patch
> to convert the macros in this file to static inline functions (at
> least the ones that can be).  I'd rather not mix it in with this patch
> for ease of comparison with the existing calls.

Ok.

Acked-by: Pavel Machek <pavel@xxxxxx>

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