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rculist: use multi-variable helpers for loop macros.

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Use multi-variable iteration helpers to rewrite rculist loops macros.

There is an important behavior change compared with the previous
implementation: When the loop ends normally (i.e: not via "break;"),
the object pointer provided by the user is NULL. This is safer
because it's not guaranteed that it would end up pointing a valid
address.

Acked-by: Eelco Chaudron <echaudro@redhat.com>
Acked-by: Dumitru Ceara <dceara@redhat.com>
Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
This commit is contained in:
Adrian Moreno
2022-03-23 12:56:21 +01:00
committed by Ilya Maximets
parent 745c80f52c
commit d293965d7b
1 changed files with 49 additions and 27 deletions
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66
lib/rculist.h
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@@ -366,34 +366,56 @@ rculist_is_singleton_protected(const struct rculist *list)
}
#define RCULIST_FOR_EACH(ITER, MEMBER, RCULIST) \
for (INIT_CONTAINER(ITER, rculist_next(RCULIST), MEMBER); \
&(ITER)->MEMBER != (RCULIST); \
ASSIGN_CONTAINER(ITER, rculist_next(&(ITER)->MEMBER), MEMBER))
for (INIT_MULTIVAR(ITER, MEMBER, rculist_next(RCULIST), \
const struct rculist); \
CONDITION_MULTIVAR(ITER, MEMBER, ITER_VAR(ITER) != (RCULIST)); \
UPDATE_MULTIVAR(ITER, rculist_next(ITER_VAR(ITER))))
#define RCULIST_FOR_EACH_CONTINUE(ITER, MEMBER, RCULIST) \
for (ASSIGN_CONTAINER(ITER, rculist_next(&(ITER)->MEMBER), MEMBER); \
&(ITER)->MEMBER != (RCULIST); \
ASSIGN_CONTAINER(ITER, rculist_next(&(ITER)->MEMBER), MEMBER))
for (INIT_MULTIVAR(ITER, MEMBER, rculist_next(&(ITER)->MEMBER), \
const struct rculist); \
CONDITION_MULTIVAR(ITER, MEMBER, ITER_VAR(ITER) != (RCULIST)); \
UPDATE_MULTIVAR(ITER, rculist_next(ITER_VAR(ITER))))
#define RCULIST_FOR_EACH_REVERSE_PROTECTED(ITER, MEMBER, RCULIST) \
for (INIT_CONTAINER(ITER, (RCULIST)->prev, MEMBER); \
&(ITER)->MEMBER != (RCULIST); \
ASSIGN_CONTAINER(ITER, (ITER)->MEMBER.prev, MEMBER))
for (INIT_MULTIVAR(ITER, MEMBER, (RCULIST)->prev, struct rculist); \
CONDITION_MULTIVAR(ITER, MEMBER, ITER_VAR(ITER) != (RCULIST)); \
UPDATE_MULTIVAR(ITER, ITER_VAR(VAR).prev))
#define RCULIST_FOR_EACH_REVERSE_PROTECTED_CONTINUE(ITER, MEMBER, RCULIST) \
for (ASSIGN_CONTAINER(ITER, (ITER)->MEMBER.prev, MEMBER); \
&(ITER)->MEMBER != (RCULIST); \
ASSIGN_CONTAINER(ITER, (ITER)->MEMBER.prev, MEMBER))
for (INIT_MULTIVAR(ITER, MEMBER, (ITER)->MEMBER.prev, struct rculist); \
CONDITION_MULTIVAR(ITER, MEMBER, ITER_VAR(ITER) != (RCULIST)); \
UPDATE_MULTIVAR(ITER, ITER_VAR(VAR).prev))
#define RCULIST_FOR_EACH_PROTECTED(ITER, MEMBER, RCULIST) \
for (INIT_CONTAINER(ITER, rculist_next_protected(RCULIST), MEMBER); \
&(ITER)->MEMBER != (RCULIST); \
ASSIGN_CONTAINER(ITER, rculist_next_protected(&(ITER)->MEMBER), \
MEMBER))
for (INIT_MULTIVAR(ITER, MEMBER, rculist_next_protected(RCULIST), \
struct rculist); \
CONDITION_MULTIVAR(ITER, MEMBER, ITER_VAR(ITER) != (RCULIST)); \
UPDATE_MULTIVAR(ITER, rculist_next_protected(ITER_VAR(ITER))) \
#define RCULIST_FOR_EACH_SAFE_SHORT_PROTECTED(ITER, MEMBER, RCULIST) \
for (INIT_MULTIVAR_SAFE_SHORT(ITER, MEMBER, \
rculist_next_protected(RCULIST), \
struct rculist); \
CONDITION_MULTIVAR_SAFE_SHORT(ITER, MEMBER, \
ITER_VAR(ITER) != (RCULIST), \
ITER_NEXT_VAR(ITER) = rculist_next_protected(ITER_VAR(VAR))); \
UPDATE_MULTIVAR_SHORT(ITER))
#define RCULIST_FOR_EACH_SAFE_LONG_PROTECTED(ITER, NEXT, MEMBER, RCULIST) \
for (INIT_MULTIVAR_SAFE_LONG(ITER, NEXT, MEMBER, \
rculist_next_protected(RCULIST) \
struct rculist); \
CONDITION_MULTIVAR_SAFE_LONG(VAR, NEXT, MEMBER \
ITER_VAR(ITER) != (RCULIST), \
ITER_VAR(NEXT) = rculist_next_protected(ITER_VAR(VAR)), \
ITER_VAR(NEXT) != (RCULIST)); \
UPDATE_MULTIVAR_LONG(ITER))
#define RCULIST_FOR_EACH_SAFE_PROTECTED(...) \
OVERLOAD_SAFE_MACRO(RCULIST_FOR_EACH_SAFE_LONG_PROTECTED, \
RCULIST_FOR_EACH_SAFE_SHORT_PROTECTED, \
4, __VA_ARGS__)
#define RCULIST_FOR_EACH_SAFE_PROTECTED(ITER, NEXT, MEMBER, RCULIST) \
for (INIT_CONTAINER(ITER, rculist_next_protected(RCULIST), MEMBER); \
(&(ITER)->MEMBER != (RCULIST) \
? INIT_CONTAINER(NEXT, rculist_next_protected(&(ITER)->MEMBER), \
MEMBER), 1 : 0); \
(ITER) = (NEXT))
#endif /* rculist.h */