linux-kernel - Re: [PATCH 04/17] staging: lustre: obdclass: don't require lct

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Date:   Wed, 7 Mar 2018 21:10:16 +0000
From:   "Dilger, Andreas" <andreas.dilger@...el.com>
To:     NeilBrown <neilb@...e.com>
CC:     "Drokin, Oleg" <oleg.drokin@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        James Simmons <jsimmons@...radead.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: Re: [PATCH 04/17] staging: lustre: obdclass: don't require
 lct_owner to be non-NULL.

On Mar 1, 2018, at 16:31, NeilBrown <neilb@...e.com> wrote:
> 
> Some places in lu_object.c allow lct_owner to be NULL, implying
> that the code is built in to the kernel (not a module), but
> two places don't.  This prevents us from building lustre into
> the kernel.
> 
> So remove the requirement and always allow lct_owner to be NULL.
> 
> This requires removing an "assert" that the module count is positive,
> but this is redundant as module_put() already does the necessary test.
> 
> Signed-off-by: NeilBrown <neilb@...e.com>

Reviewed-by: Andreas Dilger <andreas.dilger@...el.com>

> ---
> drivers/staging/lustre/lustre/obdclass/lu_object.c |    7 +------
> 1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/lustre/lustre/obdclass/lu_object.c b/drivers/staging/lustre/lustre/obdclass/lu_object.c
> index cca688175d2d..880800e78c52 100644
> --- a/drivers/staging/lustre/lustre/obdclass/lu_object.c
> +++ b/drivers/staging/lustre/lustre/obdclass/lu_object.c
> @@ -1380,12 +1380,8 @@ static void key_fini(struct lu_context *ctx, int index)
> 		lu_ref_del(&key->lct_reference, "ctx", ctx);
> 		atomic_dec(&key->lct_used);
> 
> -		if ((ctx->lc_tags & LCT_NOREF) == 0) {
> -#ifdef CONFIG_MODULE_UNLOAD
> -			LINVRNT(module_refcount(key->lct_owner) > 0);
> -#endif
> +		if ((ctx->lc_tags & LCT_NOREF) == 0)
> 			module_put(key->lct_owner);
> -		}
> 		ctx->lc_value[index] = NULL;
> 	}
> }
> @@ -1619,7 +1615,6 @@ static int keys_fill(struct lu_context *ctx)
> 			LINVRNT(key->lct_init);
> 			LINVRNT(key->lct_index == i);
> 
> -			LASSERT(key->lct_owner);
> 			if (!(ctx->lc_tags & LCT_NOREF) &&
> 			    !try_module_get(key->lct_owner)) {
> 				/* module is unloading, skip this key */
> 
> 

Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Intel Corporation