linux-kernel - Re: [PATCH] lib: make sg_pool explicitly non-modular

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Message-ID: <20160421030249.GG13379@windriver.com>
Date:	Wed, 20 Apr 2016 23:02:49 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Ming Lin <mlin@...nel.org>
CC:	<linux-kernel@...r.kernel.org>, Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	"Martin K . Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH] lib: make sg_pool explicitly non-modular

[Re: [PATCH] lib: make sg_pool explicitly non-modular] On 20/04/2016 (Wed 13:28) Ming Lin wrote:

> On Wed, 2016-04-20 at 15:13 -0400, Paul Gortmaker wrote:
> > The recently added Kconfig controlling compilation of this code is:
> > 
> > lib/Kconfig:config SG_POOL
> > lib/Kconfig:    def_bool n
> > 
> > ...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 remains unchanged with this commit.  However
> > one might want to consider moving it to subsys_initcall if it is to
> > be ready ahead of SCSI drivers wanting this and using device_initcall.
> > 
> > Cc: Christoph Hellwig <hch@....de>
> > Cc: Ming Lin <ming.l@....samsung.com>
> > Cc: Sagi Grimberg <sagi@...mberg.me>
> > Cc: Martin K. Petersen <martin.petersen@...cle.com>
> > Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> > ---
> >  lib/sg_pool.c | 17 ++---------------
> >  1 file changed, 2 insertions(+), 15 deletions(-)
> > 
> > diff --git a/lib/sg_pool.c b/lib/sg_pool.c
> > index 6dd30615a201..e2cf548b9610 100644
> > --- a/lib/sg_pool.c
> > +++ b/lib/sg_pool.c
> > @@ -1,4 +1,4 @@
> > -#include <linux/module.h>
> > +#include <linux/init.h>
> >  #include <linux/scatterlist.h>
> >  #include <linux/mempool.h>
> >  #include <linux/slab.h>
> > @@ -156,17 +156,4 @@ cleanup_sdb:
> >  
> >  	return -ENOMEM;
> >  }
> > -
> > -static __exit void sg_pool_exit(void)
> > -{
> > -	int i;
> > -
> > -	for (i = 0; i < SG_MEMPOOL_NR; i++) {
> > -		struct sg_pool *sgp = sg_pools + i;
> > -		mempool_destroy(sgp->pool);
> > -		kmem_cache_destroy(sgp->slab);
> > -	}
> > -}
> > -
> > -module_init(sg_pool_init);
> > -module_exit(sg_pool_exit);
> > +device_initcall(sg_pool_init);
> 
> For SCSI it's OK because always CONFIG_SCSI=y
> 
> But we may have a kernel .config with !CONFIG_SCSI and other
> non-block-device driver may use this sg_pool.
> 
> So the .config will have CONFIG_SG_POOL=m

That is impossible currently, since as per above, the variable is bool
and not tristate.  Did you mean to make it tristate?

Paul.
--

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