Re: [PATCH 1/8] hugetlb: make mm and fs code explicitly non-modular

[Davidlohr Bueso]

On Thu, 17 Dec 2015, Paul Gortmaker wrote:

> The Kconfig currently controlling compilation of this code is:
>
> config HUGETLBFS
>        bool "HugeTLB file system support"
>
> ...meaning that it currently is not being built as a module by anyone.
>
> Lets remove the modular code that is essentially orphaned, so that
> when reading the driver there is no doubt it is builtin-only.
>
> Since module_init translates to device_initcall in the non-modular
> case, the init ordering gets moved to earlier levels when we use the
> more appropriate initcalls here.
>
> Originally I had the fs part and the mm part as separate commits,
> just by happenstance of the nature of how I detected these
> non-modular use cases.  But that can possibly introduce regressions
> if the patch merge ordering puts the fs part 1st -- as the 0-day
> testing reported a splat at mount time.
>
> Investigating with "initcall_debug" showed that the delta was
> init_hugetlbfs_fs being called _before_ hugetlb_init instead of
> after.  So both the fs change and the mm change are here together.
>
> In addition, it worked before due to luck of link order, since they
> were both in the same initcall category.  So we now have the fs
> part using fs_initcall, and the mm part using subsys_initcall,
> which puts it one bucket earlier.  It now passes the basic sanity
> test that failed in earlier 0-day testing.
>
> We delete the MODULE_LICENSE tag and capture that information at the
> top of the file alongside author comments, etc.
>
> We don't replace module.h with init.h since the file already has that.
> Also note that MODULE_ALIAS is a no-op for non-modular code.
>
> Cc: Nadia Yvette Chambers <nyc@xxxxxxxxxxxxxx>
> Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
> Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
> Cc: David Rientjes <rientjes@xxxxxxxxxx>
> Cc: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
> Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
> Cc: linux-mm@xxxxxxxxx
> Cc: linux-fsdevel@xxxxxxxxxxxxxxx
> Reported-by: kernel test robot <ying.huang@xxxxxxxxxxxxxxx>
> Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>

Acked-by: Davidlohr Bueso <dave@xxxxxxxxxxxx>
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