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    SubjectRe: [PATCH 11/11] protect architectures where THREAD_SIZE >= PAGE_SIZE against fork bombs
    On Mon, 25 Jun 2012, Glauber Costa wrote:

    > diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
    > index ccc1899..914ec07 100644
    > --- a/include/linux/thread_info.h
    > +++ b/include/linux/thread_info.h
    > @@ -61,6 +61,12 @@ extern long do_no_restart_syscall(struct restart_block *parm);
    > # define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK)
    > #endif
    >
    > +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
    > +# define THREADINFO_GFP_ACCOUNTED (THREADINFO_GFP | __GFP_KMEMCG)
    > +#else
    > +# define THREADINFO_GFP_ACCOUNTED (THREADINFO_GFP)
    > +#endif
    > +

    This type of requirement is going to become nasty very quickly if nobody
    can use __GFP_KMEMCG without testing for CONFIG_CGROUP_MEM_RES_CTLR_KMEM.
    Perhaps define __GFP_KMEMCG to be 0x0 if it's not enabled, similar to how
    kmemcheck does?


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