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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2005-10-03 13:57:23 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-10-03 13:57:23 -0700 |
| commit | 325ed8239309cb29f10ea58c5a668058ead11479 (patch) | |
| tree | 77386825b72ac44f4f42a942ef78bd1ff924b351 /net/core | |
| parent | ddea7be0ec8d1374f0b483a81566ed56ec9f3905 (diff) | |
| download | linux-325ed8239309cb29f10ea58c5a668058ead11479.tar.gz linux-325ed8239309cb29f10ea58c5a668058ead11479.tar.bz2 linux-325ed8239309cb29f10ea58c5a668058ead11479.zip | |
[NET]: Fix packet timestamping.
I've found the problem in general. It affects any 64-bit
architecture. The problem occurs when you change the system time.
Suppose that when you boot your system clock is forward by a day.
This gets recorded down in skb_tv_base. You then wind the clock back
by a day. From that point onwards the offset will be negative which
essentially overflows the 32-bit variables they're stored in.
In fact, why don't we just store the real time stamp in those 32-bit
variables? After all, we're not going to overflow for quite a while
yet.
When we do overflow, we'll need a better solution of course.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/skbuff.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index f80a28785610..0e9431b59fb2 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -71,8 +71,6 @@ static kmem_cache_t *skbuff_head_cache __read_mostly; static kmem_cache_t *skbuff_fclone_cache __read_mostly; -struct timeval __read_mostly skb_tv_base; - /* * Keep out-of-line to prevent kernel bloat. * __builtin_return_address is not used because it is not always @@ -1708,8 +1706,6 @@ void __init skb_init(void) NULL, NULL); if (!skbuff_fclone_cache) panic("cannot create skbuff cache"); - - do_gettimeofday(&skb_tv_base); } EXPORT_SYMBOL(___pskb_trim); @@ -1743,4 +1739,3 @@ EXPORT_SYMBOL(skb_prepare_seq_read); EXPORT_SYMBOL(skb_seq_read); EXPORT_SYMBOL(skb_abort_seq_read); EXPORT_SYMBOL(skb_find_text); -EXPORT_SYMBOL(skb_tv_base); |