In message: <200910311035.n9vazfib082...@svn.freebsd.org>
Ed Schouten <e...@freebsd.org> writes:
: Author: ed
: Date: Sat Oct 31 10:35:41 2009
: New Revision: 198706
: URL: http://svn.freebsd.org/changeset/base/198706
:
: Log:
: Turn unused structure fields of cdevsw into spares.
:
: d_uid, d_gid and d_mode are unused, because permissions are stored in
: cdevpriv nowadays. d_kind doesn't seem to be used at all. We no longer
: keep a list of cdevsw's, so d_list is also unused.
:
: uid_t and gid_t are 32 bits, but mode_t is 16 bits, Because of alignment
: constraints of d_kind, we can safely turn it into three 32-bit integers.
: d_kind and d_list is equal in size to three pointers.
:
: Discussed with: kib
Don't we need a D_VERSION bump for this?
Warner
: Modified:
: head/sys/sys/conf.h
:
: Modified: head/sys/sys/conf.h
: ==============================================================================
: --- head/sys/sys/conf.h Sat Oct 31 09:03:48 2009 (r198705)
: +++ head/sys/sys/conf.h Sat Oct 31 10:35:41 2009 (r198706)
: @@ -210,15 +210,13 @@ struct cdevsw {
: d_kqfilter_t *d_kqfilter;
: d_purge_t *d_purge;
: d_mmap_single_t *d_mmap_single;
: - uid_t d_uid;
: - gid_t d_gid;
: - mode_t d_mode;
: - const char *d_kind;
: +
: + int32_t d_spare0[3];
: + void *d_spare1[3];
:
: /* These fields should not be messed with by drivers */
: - LIST_ENTRY(cdevsw) d_list;
: LIST_HEAD(, cdev) d_devs;
: - int d_spare3;
: + int d_spare2;
: union {
: struct cdevsw *gianttrick;
: SLIST_ENTRY(cdevsw) postfree_list;
:
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