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    SubjectRe: + task_struct-make-journal_info-conditional.patch added to -mm tree
    On Fri, Dec 04, 2009 at 12:58:06PM +0900, Hiroshi Shimamoto wrote:
    > Alexey Dobriyan wrote:
    > > On Thu, Dec 03, 2009 at 02:40:57PM -0800, akpm@linux-foundation.org wrote:
    > >> --- a/include/linux/sched.h~task_struct-make-journal_info-conditional
    > >> +++ a/include/linux/sched.h
    > >> @@ -1452,8 +1452,10 @@ struct task_struct {
    > >> gfp_t lockdep_reclaim_gfp;
    > >> #endif
    > >>
    > >> +#ifdef CONFIG_FS_JOURNAL_INFO
    > >> /* journalling filesystem info */
    > >> void *journal_info;
    > >> +#endif
    > >
    > > This will prevent using e.g. ext3 on CONFIG_EXT3_FS=n kernels.
    >
    > I'm sorry, I'm not sure what you're mentioning.

    With this patch admin must decide in advance if he will ever use ext3.
    EXT3_FS=n kernels won't be able to get ext3 support without reboot
    even as module, because task_struct will be different.

    Which is a regression compared to current state.

    The biggest example of such behaviour is ipv6 module, but it should not
    be spread more.


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