Q: (stupid) can't we "fix" hlist_for_each_entry() ?
From: Oleg Nesterov
Date: Wed Mar 12 2008 - 04:13:20 EST
hlist_for_each_entry/hlist_for_each_entry_rcu doesn't actually need 4
arguments, it could be
#define hlist_for_each_entry_rcu(pos, head, member) \
for (pos = hlist_entry((head)->first, typeof(*(pos)), member); \
rcu_dereference(pos) != hlist_entry(NULL, typeof(*(pos)), member) && \
({ prefetch((pos)->member.next); 1; }); \
(pos) = hlist_entry((pos)->member.next, typeof(*(pos)), member))
Or,
#define hlist_for_each_entry_rcu(pos, head, member) \
for (pos = (void*)(head)->first; \
rcu_dereference(pos) && ({ prefetch(((hlist_node*)pos)->next); 1; }) && \
({ (pos) = hlist_entry((void*)(pos), typeof(*(pos)), member)); 1; }); \
(pos) = (void*)(pos)->member.next)
Q: is it worth "fixing" ?
If yes, what is the "right" way to do this? These macros are spread all over
the kernel...
Oleg.
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