[PATCH] hugetlb_cgroup: explicitly init the early_init field

[Jianyu Zhan]

Hi, hillf,

On Tue, Apr 22, 2014 at 2:47 PM, Hillf Danton <dhillf at gmail.com> wrote:
> But other fields still missed, if any. Fair?

yep, it is not fair.

Sure for this global variable struct, if not initailized, its all
fields will be initialized
to 0 or null(depending on its type).  The point here is no to deprive
the rights of
compiler/linker of doing this initialization, it is mainly for
documentation reason.
Actually this field's value would affect how ->css_alloc should implemented.

Concretely, if early_init is nonzero, then ->css_alloc *must not* call kzalloc,
because in cgroup implementation, ->css_alloc will be called earlier before
mm_init().

I don't think that the value of one field(early_init) has a so subtle
restrition on the
another field(css_alloc) is a good thing, but since it is there,
docment it should
be needed.


Thanks,
Jianyu Zhan