linux-kernel - LIBCFS

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Date:	Sun, 28 Jun 2015 08:52:46 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	"Dilger, Andreas" <andreas.dilger@...el.com>
cc:	Julia Lawall <Julia.Lawall@...6.fr>,
	"Drokin, Oleg" <oleg.drokin@...el.com>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"lustre-devel@...ts.lustre.org" <lustre-devel@...ts.lustre.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: LIBCFS_ALLOC

It is not clear that all of the uses of LIBCFS_ALLOC really risk needing 
vmalloc.  For example:

lnet/klnds/socklnd/socklnd.c, function ksocknal_accept:

ksock_connreq_t *cr;
...
LIBCFS_ALLOC(cr, sizeof(*cr));

The definition of ksock_connreq_t is:

typedef struct ksock_connreq {
        struct list_head ksncr_list;  /* stash on ksnd_connd_connreqs */
        lnet_ni_t        *ksncr_ni;   /* chosen NI */
        struct socket    *ksncr_sock; /* accepted socket */
} ksock_connreq_t;

This looks like a very small structure.

LIBCFS_ALLOC relies on a test on the size, which should be able to be 
compiled away.  libcfs_kvzalloc on the other hand relies on the failure of 
kmalloc and so the test for that won't be compiled away.

Does it matter?

julia
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