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

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Message-ID: <20151218024644.GA17386@linux-uzut.site>
Date:	Thu, 17 Dec 2015 18:46:44 -0800
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	linux-kernel@...r.kernel.org,
	Nadia Yvette Chambers <nyc@...omorphy.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Mike Kravetz <mike.kravetz@...cle.com>,
	David Rientjes <rientjes@...gle.com>,
	Hillf Danton <hillf.zj@...baba-inc.com>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/8] hugetlb: make mm and fs code explicitly non-modular

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@...omorphy.com>
>Cc: Alexander Viro <viro@...iv.linux.org.uk>
>Cc: Andrew Morton <akpm@...ux-foundation.org>
>Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
>Cc: Mike Kravetz <mike.kravetz@...cle.com>
>Cc: David Rientjes <rientjes@...gle.com>
>Cc: Hillf Danton <hillf.zj@...baba-inc.com>
>Cc: Davidlohr Bueso <dave@...olabs.net>
>Cc: linux-mm@...ck.org
>Cc: linux-fsdevel@...r.kernel.org
>Reported-by: kernel test robot <ying.huang@...ux.intel.com>
>Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>

Acked-by: Davidlohr Bueso <dave@...olabs.net>
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