Message	SHA1
net: u64_stats_fetch_begin_bh() and u64_stats_fetch_retry_bh() ... - Must disable preemption in case of 32bit UP in u64_stats_fetch_begin() and u64_stats_fetch_retry() - Add new u64_stats_fetch_begin_bh() and u64_stats_fetch_retry_bh() for network usage, disabling BH on 32bit UP only. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Eric Dumazet   authored and   David S. Miller   commited 2010-06-28 23:24:30 -07:00	33d91f00c7
net: u64_stats_sync improvements ... - Add a comment about interrupts: 6) If counter might be written by an interrupt, readers should block interrupts. - Fix a typo in sample of use. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Eric Dumazet   authored and   David S. Miller   commited 2010-06-28 23:24:29 -07:00	b6b3ecc71a
net: Introduce u64_stats_sync infrastructure ... To properly implement 64bits network statistics on 32bit or 64bit hosts, we provide one new type and four methods, to ease conversions. Stats producer should use following template granted it already got an exclusive access to counters (include/linux/u64_stats_sync.h contains some documentation about details) u64_stats_update_begin(&stats->syncp); stats->bytes64 += len; stats->packets64++; u64_stats_update_end(&stats->syncp); While a consumer should use following template to get consistent snapshot : u64 tbytes, tpackets; unsigned int start; do { start = u64_stats_fetch_begin(&stats->syncp); tbytes = stats->bytes64; tpackets = stats->packets64; } while (u64_stats_fetch_retry(&stats->lock, syncp)); Suggested by David Miller, and comments courtesy of Nick Piggin. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Eric Dumazet   authored and   David S. Miller   commited 2010-06-23 12:59:47 -07:00	16b8a4761c