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| author | brian <brian@FreeBSD.org> | 2004-09-20 08:52:04 +0000 |
|---|---|---|
| committer | brian <brian@FreeBSD.org> | 2004-09-20 08:52:04 +0000 |
| commit | 255869f38742c021238fcbd7b42b873bd386abc1 (patch) | |
| tree | 89f989e68ef4800f4e516c65ea1ad8ebdf3d23f4 /sys/kern/kern_mbuf.c | |
| parent | 47d07987e28789eba8ae76f7d2389cba299f0e8a (diff) | |
| download | FreeBSD-src-255869f38742c021238fcbd7b42b873bd386abc1.zip FreeBSD-src-255869f38742c021238fcbd7b42b873bd386abc1.tar.gz | |
CTASSERT that MSZIE is a power of 2 (otherwise dtom() breaks)
Ask uma_zcreate() to align mbufs to MSIZE bytes (otherwise dtom() breaks)
As it happens, uma_zalloc_arg() always returned mbufs aligned to MSIZE
anyway, but that was an implementation side-effect....
KASSERT -> CTASSERT suggested by: dd@
Approved by: silence on -net
Diffstat (limited to 'sys/kern/kern_mbuf.c')
| -rw-r--r-- | sys/kern/kern_mbuf.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/sys/kern/kern_mbuf.c b/sys/kern/kern_mbuf.c index c2b749f..cfbc9d5 100644 --- a/sys/kern/kern_mbuf.c +++ b/sys/kern/kern_mbuf.c @@ -123,6 +123,9 @@ static void mb_fini_pack(void *, int); static void mb_reclaim(void *); static void mbuf_init(void *); +/* Ensure that MSIZE doesn't break dtom() - it must be a power of 2 */ +CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE); + /* * Initialize FreeBSD Network buffer allocation. */ @@ -135,7 +138,7 @@ mbuf_init(void *dummy) * Configure UMA zones for Mbufs, Clusters, and Packets. */ zone_mbuf = uma_zcreate("Mbuf", MSIZE, mb_ctor_mbuf, mb_dtor_mbuf, - NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_MAXBUCKET); + NULL, NULL, MSIZE - 1, UMA_ZONE_MAXBUCKET); zone_clust = uma_zcreate("MbufClust", MCLBYTES, mb_ctor_clust, mb_dtor_clust, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_REFCNT); if (nmbclusters > 0) |
