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Turn unused structure fields of cdevsw into spares.

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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
This commit is contained in:
Ed Schouten 2009-10-31 10:35:41 +00:00
parent d521940e9a
commit 2d2a89dd2d
1 changed files with 4 additions and 6 deletions
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10
sys/sys/conf.h
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@ -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;